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arXiv 2021年

作者： Boubeche, Mebrouka Wang, Ningning Sun, Jianping Yang, Pengtao Zeng, Lingyong Li, Qizhi He, Yiyi Luo, Shaojuan Cheng, Jinguang Peng, Yingying Luo, Huixia School of Materials Science and Engineering State Key Laboratory of Optoelectronic Materials and Technologies Key Lab of Polymer Composite & Functional Materials Sun Yat-Sen University No. 135 Xingang Xi Road Guangzhou510275 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China International Center for Quantum Materials School of Physics Peking University Beijing100871 China School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou510006 China

We report the anomalous charge density wave (CDW) state evolution and dome-like superconductivity (SC) in CuIr2Te4-xSex(0 ≤ x ≤ 0.5) series. Room temperature powder X ray-diffraction (PXRD) results indicate that CuIr2Te4-xSex(0 ≤ x ≤ 0.5) compounds retain the same structure as the host CuIr2Te4and the unit cell constants a and c manifest a linear decline with increasing Se content. Magnetization, resistivity and heat capacity results suggest that superconducting transition temperature (Tc) exhibits a weak dome-like variation as substituting Te by Se with the maximum Tc= 2.83 K for x = 0.1 followed by suppression in Tcand simultaneous decrease of the superconducting volume fraction. Unexpectedly, the CDW-like transition (TCDW) is suppressed with lower Se doping (0.025 ≤ x ≤ 0.2) but re-emerges at higher doping (0.25 ≤ x ≤ 0.5). Meanwhile, the temperature-dependent XRD measurements show that the trigonal structure is stable at 20 K, 100 K and 300 K for the host sample and the doping composition with x = 0.5, thus we propose that the behaviour CDW-like transition arises from the disorder effect created by chemical doping and is not related to structural transition. The lower and the upper critical fields of these compounds are also addressed. Copyright © 2021, The Authors. All rights reserved.

关键词： Selenium

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Electrochemical-sensor, antimicrobial and environmental assessments of Bi3+:Mg(1−x)ZrxO4NPs synthesised by bio-mediated combustion method

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Sensing technology 2023年第1期1卷

作者： B. S. Surendra K. Gurushantha Chinnam Sampath Vijaya V. Shanbhag T. Kiran M. Chandrasekhar S. N. Manjula G. Shobha H. C. Ananda Murthy a Department of Chemistry Dayananda Sagar College of Engineering Bengaluru India b Department of Chemistry M. S. Ramaiah Institute of Technology VTU Bengaluru India c Department of Physics GFGC Bengaluru India d Department of Chemistry SJB Institute of Technology Bangalore India e Department of Physics East West Institute of Technology VTU Bengaluru India f Department of Physics SJR College for Women Bengaluru India g Department of Biotechnology Sapthagiri College of Engineering Visvesvaraya Technological University Bengaluru India h Department of Physical and Chemical Sciences School of Science Sri Sathya Sai University for Human Excellence Chikkaballapur Karnataka India

The reported research elucidates on a facilePhyllanthus acidusgreen-assisted solution combustion process developed for the synthesis of Bi3+:Mg(1−x)ZrxO4nanoparticles (BMZ-NPs) and evaluation of their multifunctional applications. PXRD investigation shows the structural evidences and average-particle size (∼30-44) nm of prepared BMZ NPs. SEM-EDAX characterises the surface-morphology and chemical constituents of BMZ-NPs. The band gap energy (Eg) values of undoped and Bi doped MgZrO4NPs (0.01-0.05 mol%) were noted between 3.86 to 2.8 eV, investigated by UV-Visible spectral techniques. The electrochemical analysis of prepared samples revealed a good sensor activity towards paracetamol drug chemical detection under both acidic and basic electrolytic media. An excellent photo-degradation activity was noted for BMZ-NPs on AO-7 as model dye and shows 91.4% at 90 min under irradiation of UV Visible-light. Additionally, the antibacterial activity of BMZ NPs against gram + ve and gram -ve bacteria was examined in well diffusion agar technique. The obtained diameter of zone inhibition illustrates BMZ NPs hinders the growth ofS. aureusbacteria (5.2 mm against antibiotic streptomycin of 2 mm) much more effectively thanE. coli(5.2 mm against ampicillin of 7.7 mm). These results are confirms that the BMZ NPs is an potential candidate for catalytic, sensor and optoelectronic device applications.

关键词： Bi3+:Mg(1−x)ZrxO4 Phyllanthus acidus electrochemical sensor photocatalysis anti-bacterial activity

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Topological phase transition in a magnetic weyl semimetal

arXiv

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arXiv 2021年

作者： Liu, D.F. Xu, Q.N. Liu, E.K. Shen, J.L. Le, C.C. Li, Y.W. Pei, D. Liang, A.J. Dudin, P. Kim, T.K. Cacho, C. Xu, Y.F. Sun, Y. Yang, L.X. Liu, Z.K. Felser, C. Parkin, S.S.P. Chen, Y.L. Max Planck Institute of Microstructure Physics Halle06120 Germany School of Physical Science and Technology ShanghaiTech University Shanghai201210 China Max Planck Institute for Chemical Physics of Solids DresdenD-01187 Germany Institute of Physics Chinese Academy of Sciences Beijing100190 China Songshan Lake Materials Laboratory Guangdong Dongguan523808 China Clarendon Laboratory Department of Physics University of Oxford OxfordOX1 3PU United Kingdom ShanghaiTech Laboratory for Topological Physics Shanghai200031 China Diamond Light Source DidcotOX110DE United Kingdom State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Frontier Science Center for Quantum Information Beijing100084 China John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States Department of Physics Harvard University CambridgeMA02138 United States

Topological Weyl semimetals (TWSs) are exotic crystals possessing emergent relativistic Weyl fermions connected by unique surface Fermi-arcs (SFAs) in their electronic structures. To realize the TWS state, certain symmetry (such as the inversion or time reversal symmetry) must be broken, leading to a topological phase transition (TPT). Despite the great importance in understanding the formation of TWSs and their unusual properties, direct observation of such a TPT has been challenging. Here, using a recently discovered magnetic TWS Co3Sn2S2, we were able to systematically study its TPT with detailed temperature dependence of the electronic structures by angle-resolved photoemission spectroscopy. The TPT with drastic band structures evolution was clearly observed across the Curie temperature (TC = 177 K), including the disappearance of the characteristic SFAs and the recombination of the spin-split bands that leads to the annihilation of Weyl points with opposite chirality. These results not only reveal important insights on the interplay between the magnetism and band topology in TWSs, but also provide a new method to control their exotic physical properties. Copyright © 2021, The Authors. All rights reserved.

关键词： Topology

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Direct observation of the spin-orbit coupling effect in Magnetic Weyl semimetal Co3Sn2S2

arXiv

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arXiv 2021年

作者： Liu, De Fa Liu, E.K. Xu, Q.N. Shen, J.L. Li, Y.W. Pei, D. Liang, A.J. Dudin, P. Kim, T.K. Cacho, C. Xu, Y.F. Sun, Y. Yang, L.X. Liu, Z.K. Felser, C. Parkin, S.S.P. Chen, Y.L. Max Planck Institute of Microstructure Physics Halle06120 Germany School of Physical Science and Technology ShanghaiTech University Shanghai201210 China Institute of Physics Chinese Academy of Sciences Beijing100190 China Songshan Lake Materials Laboratory Dongguan Guangdong523808 China Max Planck Institute for Chemical Physics of Solids DresdenD-01187 Germany Clarendon Laboratory Department of Physics University of Oxford OxfordOX1 3PU United Kingdom ShanghaiTech Laboratory for Topological Physics Shanghai200031 China Diamond Light Source DidcotOX110DE United Kingdom State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Frontier Science Center for Quantum Information Beijing100084 China John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States Department of Physics Harvard University CambridgeMA02138 United States

The spin-orbit coupling (SOC) lifts the band degeneracy that plays a vital role in the search for different topological states, such as topological insulators (TIs) and topological semimetals (TSMs). In TSMs, the SOC can partially gap a degenerate nodal line, leading to the formation of Dirac/Weyl semimetals (DSMs/WSMs). However, such SOC-induced gap structure along the nodal line in TSMs has not yet been systematically investigated experimentally. Here, we report a direct observation of such gap structure in a magnetic WSM Co3Sn2S2 using high resolution angle-resolved photoemission spectroscopy. Our results not only reveal the existence and importance of the strong SOC effect in the formation of the WSM phase in Co3Sn2S2, but also provide insights for the understanding of its exotic physical properties. Copyright © 2021, The Authors. All rights reserved.

关键词： Tin compounds

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Rational Design of Diatomic Active Sites for Elucidating Oxygen Evolution Reaction Performance Trends

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Angewandte Chemie 2024年第1期137卷

作者： Nanfeng Xu Yuxiang Jin Qiunan Liu Meng Yu Xiao Wang Chao Wang Wei Tu Zhirong Zhang Zhigang Geng Kazu Suenaga Fangyi Cheng Erhong Song Zhangquan Peng Junyuan Xu Laboratory of Advanced Spectro-electrochemistry and Li-ion Batteries Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China State Key Lab of High-Performance Ceramics and Superfine microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China The Institute of Scientific and Industrial Research (ISIR-SANKEN) Osaka University Osaka 567-0047 Japan State Key Laboratory of Advanced Chemical Power Sources College of Chemistry Nankai University Tianjin 300071 China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China

Diatomic catalysts, especially those with heteronuclear active sites, have recently attracted significant attention for their advantages over single-atom catalysts in reactions with relatively high energy barrier, e.g. oxygen evolution reaction. Rational design and synthesis of heteronuclear diatomic catalysts are of immense significance but have so far been plagued by the lack of a definitive correlation between structure and catalytic properties. Here, we report macrocyclic precursor constrained strategy to fabricate series of transition metal (M T , Ni, Co, Fe, Mn, or Cu)-noble (M N , Ir or Ru) centers in carbon material. One notable performance trend is observed in the order of Cu−M N

关键词： Diatomic catalysts Macrocyclic precursor constrained strategy Transition-noble metal centers Oxygen evolution reaction Performance descriptor

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Study of flavor dependence of the baryon-to-meson ratio in proton-proton collisions at s=13 TeV

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physical Review D 2023年第11期108卷 112003-112003页

作者： S. Acharya D. Adamová G. Aglieri Rinella M. Agnello N. Agrawal Z. Ahammed S. Ahmad S. U. Ahn I. Ahuja A. Akindinov M. Al-Turany D. Aleksandrov B. Alessandro H. M. Alfanda R. Alfaro Molina B. Ali A. Alici N. Alizadehvandchali A. Alkin J. Alme G. Alocco T. Alt A. R. Altamura I. Altsybeev M. N. Anaam C. Andrei N. Andreou A. Andronic V. Anguelov F. Antinori P. Antonioli N. Apadula L. Aphecetche H. Appelshäuser C. Arata S. Arcelli M. Aresti R. Arnaldi J. G. M. C. A. Arneiro I. C. Arsene M. Arslandok A. Augustinus R. Averbeck M. D. Azmi H. Baba A. Badalà J. Bae Y. W. Baek X. Bai R. Bailhache Y. Bailung A. Balbino A. Baldisseri B. Balis D. Banerjee Z. Banoo R. Barbera F. Barile L. Barioglio M. Barlou B. Barman G. G. Barnaföldi L. S. Barnby V. Barret L. Barreto C. Bartels K. Barth E. Bartsch N. Bastid S. Basu G. Batigne D. Battistini B. Batyunya D. Bauri J. L. Bazo Alba I. G. Bearden C. Beattie P. Becht D. Behera I. Belikov A. D. C. Bell Hechavarria F. Bellini R. Bellwied S. Belokurova G. Bencedi S. Beole Y. Berdnikov A. Berdnikova L. Bergmann M. G. Besoiu L. Betev P. P. Bhaduri A. Bhasin M. A. Bhat B. Bhattacharjee L. Bianchi N. Bianchi J. Bielčík J. Bielčíková J. Biernat A. P. Bigot A. Bilandzic G. Biro S. Biswas N. Bize J. T. Blair D. Blau M. B. Blidaru N. Bluhme C. Blume G. Boca F. Bock T. Bodova A. Bogdanov S. Boi J. Bok L. Boldizsár M. Bombara P. M. Bond G. Bonomi H. Borel A. Borissov A. G. Borquez Carcamo H. Bossi E. Botta Y. E. M. Bouziani L. Bratrud P. Braun-Munzinger M. Bregant M. Broz G. E. Bruno M. D. Buckland D. Budnikov H. Buesching S. Bufalino P. Buhler N. Burmasov Z. Buthelezi A. Bylinkin S. A. Bysiak M. Cai H. Caines A. Caliva E. Calvo Villar J. M. M. Camacho P. Camerini F. D. M. Canedo M. Carabas A. A. Carballo F. Carnesecchi R. Caron L. A. D. Carvalho J. Castillo Castellanos F. Catalano C. Ceballos Sanchez I. Chakaberia P. Chakraborty S. Chandra S. Chapeland M. Chartier S. Chattopadhyay T. G. Chavez T. Cheng C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato E. S. Chizzali J. Cho S. Cho P. Cho Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Nuclear Physics Institute of the Czech Academy of Sciences Husinec-Řež Czech Republic European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy INFN Sezione di Bologna Bologna Italy Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science P.J. Šafárik University Košice Slovak Republic Affiliated with an institute covered by a cooperation agreement with CERN Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Dipartimento di Fisica e Astronomia dell’Università Bologna Italy Sezione INFN Bologna Italy University of Houston Houston Texas USA Department of Physics and Technology University of Bergen Bergen Norway INFN Sezione di Cagliari Cagliari Italy Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany INFN Sezione di Bari Bari Italy Physik Department Technische Universität München Munich Germany Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania University of Derby Derby United Kingdom Universität Münster Institut für Kernphysik Münster Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany INFN Sezione di Padova Padova Italy Lawrence Berkeley National Laboratory Berkeley California USA SUBATECH IMT Atlantique Nantes Université CNRS-IN2P3 Nantes France Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble-Alpes CNRS-IN2P3 Grenoble France Dipartimento di Fisica dell’Univers

The production cross sections of D0 and Λc+ hadrons originating from beauty-hadron decays (i.e., nonprompt) were measured for the first time at midrapidity (|y|<0.5) by the ALICE Collaboration in proton-proton collisions at a center-of-mass energy s=13 TeV. They are described within uncertainties by perturbative QCD calculations employing the fragmentation fractions of beauty quarks to baryons measured at forward rapidity by the LHCb Collaboration. The bb¯ production cross section per unit of rapidity at midrapidity, estimated from these measurements, is dσbb¯/dy||y|<0.5=83.1±3.5(stat)±5.4(syst)−3.2+12.3(extrap) μb. The baryon-to-meson ratios are computed to investigate the hadronization mechanism of beauty quarks. The nonprompt Λc+/D0 production ratio has a similar trend to the one measured for the promptly produced charmed particles and to the p/π+ and Λ/KS0 ratios, suggesting a similar baryon-formation mechanism among light, strange, charm, and beauty hadrons. The pT -integrated nonprompt Λc+/D0 ratio is found to be significantly higher than the one measured in e+e− collisions.

关键词： Hadron-hadron interactions Particle production Bottom quark

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First-principles study of methanol adsorption on heteroatom-doped phosphorene

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Chinese chemical Letters 2019年第1期30卷 207-210页

作者： Dongdong Liu Yongliang Shi Li Tao Dafeng Yan Ru Chen Shuangyin Wang State Key Laboratory of Chem/Bio-Sensing and Chemometrics Provincial Hunan Key Laboratory for Graphene Materials and Devices College of Chemistry and Chemical Engineering Hunan University ICQD/Hefei National Laboratory for Physical Sciences at Microscale and Key Laboratory of Strongly-Coupled Quantum Matter Physics Chinese Academy of Sciences and Department of Physics University of Science and Technology of China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Shenzhen University Shenzhen Research Institute of Hunan University

First-principles calculations based on van der Waals(vdW) corrected density functional theory(DFT) are firstly employed to investigate the adsorption of methanol(CH_3OH) gas molecule on pristine and Xdoped phosphorene( =B, C, N and O). The CH_3OH gas molecule is placed on the top of different phosphorene surfaces, the whole adsorption systems are fully optimized by using Vienna ab initio simulation package(VASP). The calculation results demonstrate that both pristine and heteroatomdoped phosphorene are sensitive to CH_3OH gas molecule with a moderate adsorption energy and an excellent charge transfer. Among all the investigated adsorption configurations, CH_3OH gas molecule is physically absorbed on pristine phosphorene and heteroatom-doped phosphorene. The N and O doping improve the adsorption of phosphorene with CH_3OH gas molecule, while B and C doping are almost not beneficial compared to the pristine phosphorene. The results suggest that N-doped and O-doped phosphorene are ideal candidates used for CH_3OH gas sensing.

关键词： Methanol adsorption Gas sensing Heteroatomdoping Phosphorene Density functional theory calculation

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Considerations with stacking absorption spectra: cold H I gas in cirrus region of the Milky Way

arXiv

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arXiv 2025年

作者： Lynn, Callum Marchal, Antoine McClure-Griffiths, N.M. Miville-Deschênes, Marc-Antoine Murray, Claire E. Nguyen, Hiep Dempsey, James Di Teodoro, Enrico van Loon, Jacco Th. Dickey, John M. Lee, Min-Young Joncas, Gilles Ma, Yik Ki Pingel, Nickolas M. Stanimirović, Snežana Kemp, Ian Gibson, Steven Dénes, Helga Research School of Astronomy & Astrophysics The Australian National University CanberraACT2611 Australia Laboratoire de Physique de l’École Normale Supérieure ENS Université PSL CNRS Sorbonne Université Université de Paris ParisF-75005 France Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 United States Department of Physics & Astronomy Johns Hopkins University 3400 N. Charles Street BaltimoreMD21218 United States CSIRO Information Management and Technology GPO Box 1700 CanberraACT2601 Australia Dipartimento di Fisica e Astronomia Università degli Studi di Firenze via G. Sansone 1 Sesto Fiorentino Firenze50019 Italy Lennard-Jones Laboratories School of Chemical and Physical Sciences Keele University Staffordshire KeeleST5 5BG United Kingdom School of Natural Sciences University of Tasmania Private Bag 37 HobartTAS7001 Australia Korea Astronomy and Space Science Institute 776 Daedeok-daero Yuseong-gu Daejeon34055 Korea Republic of Department of Astronomy and Space Science University of Science and Technology 217 Gajeong-ro Daejeon34113 Korea Republic of Dépt. de physique de génie physique et d’optique Centre de recherche en astrophysique du Québec Université Laval 1045 avenue de la médecine QuébecQCG1V 0A6 Canada Department of Astronomy University of Wisconsin–Madison 475 N Charter St MadisonWI53703 United States Curtin University BentleyWA6102 Australia Department of Physics & Astronomy Western Kentucky University 1906 College Heights Boulevard Bowling GreenKY42101 United States School of Physical Sciences and Nanotechnology Yachay Tech University Hacienda San José S/N Urcuquí100119 Ecuador

We use the Milky Way neutral hydrogen (H i) absorption and emission spectra from the Galactic Australian Square Kilometre Array Pathfinder (GASKAP) Phase II Pilot survey along with toy models to investigate the effects of stacking multi-component spectra on measurements of peak optical depth and spin temperature. Shifting spectra by the peak in emission, "primary" components shifted to 0 km s−1 are correctly averaged. Additional components on individual sightlines are averaged with non-centred velocities, producing a broader and shallower "secondary" component in the resulting stack. Peak optical depths and brightness temperatures of the secondary components from stacks are lower limits of their true average values due to the velocity offset of each component. The spin temperature however is well correlated with the truth since the velocity offset of components affects the emission and absorption spectra equally. Stacking 462 GASKAP absorption-emission spectral pairs, we detect a component with a spin temperature of 1320 ± 263 K, consistent with gas from the unstable neutral medium and higher than any previous GASKAP detection in this region. We also stack 2240 pilot survey spectra containing no Milky Way absorption, revealing a primary narrow and secondary broad component, with spin temperatures belonging to the cold neutral medium (CNM). Spatially binning and stacking the non-detections across the plane-of-sky by their distance from CNM absorption detections, the primary component’s optical depth decreases with distance from known locations of cold gas. The spin temperature however remains stable in both components, over an approximate physical plane-of-sky distance of ∼ 100 pc. © 2025, CC BY-NC-SA.

关键词： Optical depth

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Charge Transport in Mixed Metal Halide Perovskite Semiconductors

arXiv

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arXiv 2022年

作者： Senanayak, Satyaprasad P. Dey, Krishanu Shivanna, Ravichandran Li, Weiwei Ghosh, Dibyajyoti Roose, Bart Zhang, Youcheng Andaji-Garmaroudi, Zahra Tiwale, Nikhil MacManus Driscoll, Judith L. Friend, Richard Stranks, Samuel D. Sirringhaus, Henning Nanoelectronics and Device Physics Lab National Institute of Science Education and Research School of Physical Sciences OCC of HBNI Jatni752050 India Optoelectronics Group Department of Physics Cavendish Laboratory JJ Thomson Avenue CambridgeCB3 0HE United Kingdom Department of Materials Science and Metallurgy University of Cambridge 27 Charles Babbage Road CambridgeCB3 0FS United Kingdom MIIT Key Laboratory of Aerospace Information Materials and Physics Nanjing University of Aeronautics and Astronautics Nanjing211106 China Department of Materials Science and Engineering Department of Chemistry Indian Institute of Technology Delhi Hauz Khas New Delhi110016 India Cambridge Graphene Centre Department of Engineering University of Cambridge 9 JJ Thomson Ave CambridgeCB3 0FA United Kingdom Center for Functional Nanomaterials Brookhaven National Laboratory UptonNY11973 United States Department of Chemical Engineering and Biotechnology Philippa Fawcett Drive CambridgeCB3 0AS United Kingdom

Investigation of the inherent field-driven charge transport behaviour of 3D lead halide perovskites has largely remained a challenging task, owing primarily to undesirable ionic migration effects near room temperature. In addition, the presence of methylammonium in many high performing 3D perovskite compositions introduces additional instabilities, which limit reliable room temperature optoelectronic device operation. Here, we address both these challenges and demonstrate that field-effect transistors (FETs) based on methylammonium-free, mixed-metal (Pb/Sn) perovskite compositions, that are widely studied for solar cell and light-emitting diode applications, do not suffer from ion migration effects as their pure Pb counterparts and reliably exhibit hysteresis free p-type transport with high mobility reaching 5.4 cm2/Vs, ON/OFF ratio approaching 106, and normalized channel conductance of 3 S/m. The reduced ion migration is also manifested in an activated temperature dependence of the field-effect mobility with low activation energy, which reflects a significant density of shallow electronic defects. We visualize the suppressed in-plane ionic migration in Sn-containing perovskites compared to their pure-Pb counterparts using photoluminescence microscopy under bias and demonstrate promising voltage and current-stress device operational stabilities. Our work establishes FETs as an excellent platform for providing fundamental insights into the doping, defect and charge transport physics of mixed-metal halide perovskite semiconductors to advance their applications in optoelectronic devices. © 2022, CC BY.

关键词： Perovskite

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Composition-dependent structural, microstructural and functional characteristics of fine-grained BaTi 1-x Hf x O 3 ceramics consolidated by Spark Plasma Sintering

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Journal of the European Ceramic Society 2025年第15期45卷

作者： Elena Mirabela Soare Cătălina-Andreea Stanciu Roxana Elena Pătru Vasile-Adrian Surdu Nadejda Horchidan Liliana Mitoşeriu Ioana Pintilie Bogdan Ştefan Vasile Adrian-Ionuţ Nicoară Roxana Doina Truşcă Adelina-Carmen Ianculescu Institute of Physical Chemistry “Ilie Murgulescu” Romanian Academy 202 Splaiul Independenţei Bucharest 060021 Romania National University of Science and Technology Politehnica Bucharest Faculty of Chemical Engineering and Biotechnologies Department Science & Engineering of Oxide Materials and Nanomaterials 1-7 Gh. Polizu Bucharest 011061 Romania National Institute for Lasers Plasma and Radiation Physics Atomiştilor 409 Măgurele 077125 Romania National Institute for Materials Physics Atomiştilor 405A Măgurele 077125 Romania Transilvania University of Braşov Faculty of Materials Science and Engineering Department of Materials Science Bv. Eroilor 29 Brasov 500036 Romania Alexandru Ioan Cuza University of Iasi Faculty of Physics Bv Carol I 11 Iaşi 700506 Romania Alexandru Ioan Cuza University of Iasi Institute of Interdisciplinary Research Department of Exact and Natural Sciences RAMTECH Center Bv Carol I 11 Iaşi 700505 Romania

The functional properties of BaTi 1-x Hf x O 3 (0 ≤x ≤ 0.20) ceramics consolidated by spark plasma sintering from Pechini nanopowders are discussed in terms of the synergic effect of overlapping dissimilar structural modifications, nanoscale grain size reduction and ferroelectric-relaxor crossover. Structural and Raman investigations revealed the coexistence of various polymorph modifications. The main effects of Hf addition are: ( i ) a strong inhibiting of the grain growth process, ( ii ) the reduction of T C and increase of the orthorhombic-tetragonal and rhombohedral-orthorhombic transition temperatures until a single, "pinched" and diffuse ferroelectric-paraelectric phase transition occurs, ( iii ) a strong flattening of the permittivity maximum, ( iv ) a slight decrease of the grain boundary resistivity, but still allowing the application of high a.c. and d.c. fields and ( v ) a gradual reduction of polarization, hysteresis loops area, energy storage capability and tunability values. Based on the dielectric and thermo-Raman results, a new low-temperature phase diagram of the fine-grained BaTi 1-x Hf x O 3 ceramics is proposed.

关键词： BaTi 1-x Hf x O 3 Modified Pechini method Spark plasma sintering Dielectric properties Ferroelectric behaviour

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