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Theoretical study on anomalous thermal expansion of two AB_(2)-type compounds

Nano Research 2024年第11期17卷 9830-9833页

作者： Xin Chen Yili Cao Xianran Xing Beijing Advanced Innovation Center for Materials Genome Engineering and Institute of Solid State Chemistry University of Science and Technology Beijing Beijing 100083 China

Anomalous thermal expansion,or other words,negative thermal expansion(NTE),resulting from the lattice contraction upon temperature increasing,has been an enduring topic for material science and *** variation of a lattice go with the temperature is straightly originated from its electronic structures and is inseparable from those physical *** the past several decades,many efforts have been made to searching new series of NTE compounds or control the thermal expansion performance in order to supply various demands of different extreme *** development of new NTE systems also dependences on the theoretical ***,we carried out theoretical calculation on CrB_(2) and FeZr_(2) with anisotropic negative thermal ***,theoretical calculations reveal that the binding of either Cr-Cr pair or Fe-Fe pair is relatively *** results reveal that the origin of NTE is the ordered magnetic state during the increasing of *** localized electrons would prevent the lattice parameters increase with heating,which shows macroscopic NTE phenomenon.

关键词： negative thermal expansion(NTE) theoretical calculation magnet state transition band structures

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Improving wear resistance of 3D printed alumina-based ceramics via sintering temperature

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China Foundry 2025年第2期22卷 151-162页

作者： Jing-wen Sun He Li Yun-song Mu Bao-xia Mu Yan-hua Chen Paolo Colombo School of Materials Science and Engineering Xinjiang Key Laboratory of Solid State Physics and DevicesXinjiang UniversityUrumqi 830046China School of Materials Science and Engineering Xinjiang Environmental and Functional Materials Engineering Research CenterXinjiang UniversityUrumqi 830046China School of Physics Science and Technology Xinjiang UniversityUrumqi 830046China Department of Industrial Engineering University of PadovaPadova 35131Italy

Ceramic materials with intricate structures can be efficiently fabricated using stereolithography(SLA)based 3D printing technology,offering advantages over traditional *** temperature has primary effect on properties of *** study investigated the crucial sintering temperature for 3D printed ceramics to ensure the desired *** results indicate that all samples exhibit a consistent layered structure across the experimental sintering *** the sintering temperature is increased from 1,250℃ to 1,350℃,the grain's morphology changes from spherical to *** morphology analysis reveals a decrease in surface roughness at sintering temperatures above 1,350℃.Mechanical tests show improved flexural strength and stiffness as the sintering temperature *** and wear experiments demonstrate that as the sintering temperature increases from 1,450℃ to 1,550℃,the wear pattern on ceramic surfaces transitions from deep pits to shallow *** increase in sintering temperature effectively enhances the wear resistance of 3D printed alumina *** improvement plays a significant role in expanding the application field of these ceramics,prolonging the lifespan of parts,reducing production costs,enhancing performance,and promoting environmental *** this study,ceramics achieve the highest strength and best wear resistance when sintered at 1,600℃,resulting in the best overall performance.

关键词： sintering temperature friction and wear properties stereolithography alumina ceramics

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Comprehensive optimization of piezoelectric coefficient and depolarization temperature in Mn-doped Bi_(0.5)Na_(0.5)TiO_(3)-Bi_(0.5)K_(0.5)TiO_(3)-BaTiO_(3)lead-free piezoceramics

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Journal of materials science & Technology 2024年第5期172卷 255-263页

作者： Huashan Zheng Enwei Sun Huajie Luo Xiaoyu Zhang Yixiao Yang Bin Yang Rui Zhang Shantao Zhang Wenwu Cao Condensed Matter Science and Technology Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin150080China Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing100083China National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringCollege of Engineering and Applied Science&Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Department of Mathematics and Materials Research Institute The Pennsylvania State UniversityUniversity ParkPennsylvania16802United States of America

Lead-free Bi_(_(0.5))Na_(_(0.5))TiO_(3)(BNT)piezoelectric ceramics have the advantages of large coercive fields and high Curie *** the improvement of piezoelectric coefficient(d 33)is usually accompanied by a huge sacrifice of depolarization temperature(T d).In this work,a well-balanced performance of d 33 and T d is achieved in MnO_(2)-doped 0.79(Bi_(_(0.5))Na_(_(0.5))TiO_(3))-0.14(Bi_(0.5)K_(0.5)TiO_(3))-0.07BaTiO_(3)ternary *** in-corporation of 0.25 mol%MnO_(2)enhances the d 33 by more than 40%,while T d remains almost unchanged(i.e.,d 33=181 pC/N,T d=184℃).X-ray diffraction(XRD)shows that an appropriate fraction of the small axis-ratio ferroelectric phase(pseudo-cubic,P c)coexists with the long-range ferroelectric phase(tetrag-onal,T)under this MnO_(2)*** force microscopy(PFM)has revealed a special domain configuration,namely large striped and layered macro domains embedded with small *** study provides a distinctive avenue to design BNT-based piezoelectric ceramics with high piezoelectric performance and temperature stability.

关键词： BNT-BKT-BT ceramics Mn doping Piezoelectric Depolarization temperature Phase structure

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Triboelectric nanogenerator hybrid array driven by multiform natural energies and its applications in self-powered cathodic protection

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science China(Technological sciences) 2024年第3期67卷 878-890页

作者： SUN Weixiang YANG Di LUO Ning LI Hao WANG DaoAi School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratoryof Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Qingdao Center of Resource Chemistry and New Materials Qingdao 266100China

In view of the increasing energy shortage and environmental pollution, the collection of friction charges to achieve the conversion of various natural energies and provide in-situ cathodic protection for metals is a significant challenge. Here, we designed a dual device-structure TENG composite array with the triboelectric layer of linear siloxane-modified polyurethane(PU) coating. This array could achieve a comprehensive collection for multiple forms of nature energy and cathodic protection of metals in multi-weather conditions. For one thing, the wave-mode TENG based on tanker structure could collect wave energy and showed the output performance with a short-circuit current of 15.5 μA. For another thing, the droplet-mode TENG based on arc-shaped surface structure could collect raindrop kinetic energy and showed the output performance with a short-circuit current of 16.3 μA. Notably, the parallel array of wave-mode TENG(W-TENG) and droplet-mode TENG(D-TENG) could simultaneously collect wave energy and raindrop kinetic energy, which showed a short-circuit current of 30.7 μA. Besides, a selfpowered a cathodic protection system powered by the dual structure TENG array is assembled and the open-circuit potential drop of the carbon steel connected with the TENG array is about 450 mV. Compared with cathodic protection system powered by single structure TENG, the composite array could provide more effective corrosion resistance for marine equipment in rainy weather. Due to the characteristic for comprehensive collection of nature energy, the anti-corrosion system supplied by TENG parallel array possesses great application potential in the all-weather corrosion protection of metal machinery under complex marine conditions.

关键词： triboelectric nanogenerator hybrid structure array siloxane-modified polyurethane cathodic protection

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A 606 W burst-mode picosecond Yb-doped all-fiber laser with an intra-burst repetition rate of 469 MHz

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High Power Laser science and engineering 2024年第6期12卷 168-177页

作者： Xinyao Li Haijuan Yu Shuzhen Zou Chaojian He Chaoyu Ning Wenjuan Wu Xuechun Chen Xuechun Lin Laboratory of All-Solid-State Light Sources Institute of SemiconductorsChinese Academy of SciencesBeijingChina College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Beijing Engineering Technology Research Center of All-Solid-State Lasers Advanced Manufacturing BeijingChina Southwest Institute of Technical Physics ChengduChina

This paper introduces a novel fiber-based picosecond burst-mode laser system capable of operating at high power and high repetition rates. A pulse-circulating fiber ring was developed as a burst generator, achieving an intra-burst repetition rate of 469 MHz without the need for a high-repetition-rate seed source. This design also allows for flexible adjustment of the number of sub-pulses, burst repetition rate and burst shape. In addition, a master oscillator power amplifier was employed to analyze the amplification characteristics of bursts. The system demonstrated a maximum average power of 606 W, with a measured sub-pulse duration of 62 ps and the highest sub-pulse peak power of 980 kW. To the best of our knowledge, this marks the highest average power obtained in burst-mode ultrafast lasers. Such a laser system holds potential for applications in precision manufacturing, high-speed imaging, high-precision ranging and other diverse domains.

关键词： burst-mode laser high power high repetition rate picosecond fiber laser

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Recent advances of photolithography patterning of quantum dots for micro-display applications

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Nano materials science 2025年第1期7卷 49-64页

作者： Xuemin Kong Xiaotong Fan Yuhui Wang Yunshu Luo Yihang Chen Tingzhu Wu Zhong Chen Yue Lin Shuli Wang Fujian Engineering Research Center for Solid-State Lighting Department of Electronic ScienceSchool of Electronic Science and EngineeringXiamen UniversityXiamen361005China State Key Laboratory of Physical Chemistry of Solid Surface Xiamen UniversityXiamen361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen361102China

The preparation of red,green,and blue quantum dot(QD)pixelated arrays with high precision,resolution,and brightness poses a significant challenge on the development of advanced micro-displays for virtual,augmented,and mixed reality *** the controlled synthesis of high-performance QDs,a reliable QD patterning technology is crucial in overcoming this *** the various methods available,photolithography-based patterning technologies show great potentials in producing ultra-fine QD patterns at micron *** review article presents the recent advancements in the field of QD patterning using photolithography techniques and explores their applications in micro-display ***,we discuss QD patterning through photolithography techniques employing photoresist(PR),which falls into two categories:PRassisted photolithography and photolithography of ***,direct photolithography techniques based on photo-induced crosslinking of photosensitive groups and photo-induced ligand cleavage mechanisms are thoroughly ***,we assess the performance of QD arrays fabricated using these photolithography techniques and their integration into QD light emitting diode display devices as well as color conversionbased micro light emitting diode display ***,we summarize the most recent developments in this field and outline future prospects.

关键词： Quantum dot Photolithography Patterning technology Micro-display

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Calibration of local chemical pressure by optical probe

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National science Review 2023年第9期10卷 258-269页

作者： Xiao Zhou Mei-Huan Zhao Shan-Ming Yao Hongliang Dong Yonggang Wang Bin Chen Xianran Xing Man-Rong Li Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistrySun Yat-sen University Center for High Pressure Science and Technology Advanced Research School of Materials Science and Engineering Peking University Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Solid State Chemistry University of Science and Technology Beijing School of Science Hainan University

Chemical stabilization of a high-pressure metastable state is a major challenge for the development of advanced *** chemical pressure(Pchem) can effectively simulate the effect of physical pressure(Pphy)) experimental calibration of the pressure passed to local structural motifs,denoted as local chemical pressure(Pchem-△) which significantly governs the function of solid materials,remains absent due to the challenge of probing *** we establish an innovative methodology to experimentally calibrate the Pchem-△and build a bridge between Pchemand Pphyvia an optical probe ***-selective Bi3+-traced REVO4（RE=Y,Gd） is adopted as a prototype to introduce Bi3+optical probes and on-site sense of the Pchem-△experienced by the *** cell compression of RE0.9gBi0.02VO4under Pphyis chemically simulated by smaller-ion substitution(Sc3+→RE3+) in *** consistent red shift（△λ） of the emission spectra of Bi3+,which is dominated by locally pressure-induced REO8dodecahedral variation in RE0.98Bi0.02VO4(Pphy) and RE0.98-xScxBi0.02VO4(Pchem-△),respectively,is evidence of their similar pressure-dependent local structure *** innovative △λ-based experimental calibration of Pchem-△in the crystal-field dimension portrays the anisotropic transmission of Pchemto the local structure and builds a bridge between Pchem-△and Pphyto guide a new perspective for affordable and practical interception of metastable states.

关键词： chemical pressure high pressure ion substitution optical parameter spectra shift pressure calibration

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Liquid-solid phase separation and recycling of permalloys in liquid Mg

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Journal of materials science & Technology 2024年第21期188卷 27-36页

作者： Pengju Yang Jie He Baodong You Mingwei Zhu Shaogang Wang Ivan Kaban Jiuzhou Zhao Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Shenyang Aerospace UniversityShenyang 110136China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Leibniz Institute for Solid State and Materials Research-IFW Dresden Helmholtzstr2001069 DresdenGermany

Liquid-solid phase separation of permalloy in liquid Mg results in selectively dissolved Ni,which provides a unique opportunity for the design of immiscible heterogeneous composite materials and the comprehensive metal recycling of permalloy scraps.A guideline of the alloy design for the liquid-solid phase separation system was *** effects of immersion temperature and time on the Ni extraction were studied by an experimental *** diffusion behavior of Ni from the permalloy to liquid Mg and the microstructure evolution in the permalloy during the liquid-solid phase separation were *** results show that the Ni in the permalloy was quickly extracted into the liquid Mg and formed an Mg-Ni alloy,while the other components such as Fe,Co,and Mn were held back in the phase-separated *** phase-separated permalloy with the solidified Mg exhibits a three-dimensional(3D)Fe/Mg bicontinuous composite ***,simple treatments were carried out for the reaction products such as the Fe/Mg bicontinuous composite and the Mg-Ni alloy,and the recycling strategies for functionalization of these treated reaction products were provided.A 3D porous Fe-based alloy with electromagnetic interference(EMI)shielding efficiency of 52 dB can be obtained if Mg is removed from the Fe/Mg bicontinuous *** of the complete separation of pure Ni from the recycled Mg-Ni alloy by vacuum distilling,the Mg-Ni alloy can be enriched into Mg2 Ni as an initial hydrogen storage material.

关键词： Immiscible alloys Liquid-solid phase separation Permalloy Selective extraction Recycling

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engineering Ferroelectric Interlayer between Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)and Lithium Metal for Stable solid-state Batteries Operating at Room Temperature

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Energy & Environmental materials 2023年第6期6卷 305-311页

作者： Tian Gu Likun Chen Yanfei Huang Jiabin Ma Peiran Shi Jie Biao Ming Liu Wei Lu Yanbing He Shenzhen All-Solid-State Lithium Battery Electrolyte Engineering Research Center Institute of Materials Research(IMR)Tsinghua Shenzhen International Graduate SchoolShenzhen 518055China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518055China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

The poor contact and side reactions between Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)(LATP)and lithium(Li)anode cause uneven Li plating and high interfacial impendence,which greatly hinder the practical application of LATP in high-energy density solid-state Li metal *** this work,a multifunctional ferroelectric BaTiO_(3)(BTO)/poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)(P[VDF-TrFE-CTFE])composite interlayer(B-TERB)is constructed between LATP and Li metal anode,which not only suppresses the Li dendrite growth,but also improves the interfacial stability and maintains the intimate interfacial contact to significantly decrease the interfacial resistance by two orders of *** B-TERB interlayer generates a uniform electric field to induce a uniform and lateral Li deposition,and therefore avoids the side reactions between Li metal and LATP achieving excellent interface *** a result,the Li/LATP@B-TERB/Li symmetrical batteries can stably cycle for 1800 h at 0.2 mA cm^(-2)and 1000 h at 0.5 mA cm^(-2).The solid-state LiFePO_(4)/LATP@B-TERB/Li full batteries also exhibit excellent cycle performance for 250 cycles at 0.5 C and room *** work proposes a novel strategy to design multifunctional ferroelectric interlayer between ceramic electrolytes and Li metal to enable stable room-temperature cycling performance.

关键词： BaTiO_(3) dendrites ferroelectric Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3) lithium metal

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Effect of adaptive nanocrystalline behaviors on the cavitation erosion performance of Cu_(47.5)Zr_(45.1)Al_(7.4) bulk metallic glass

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Journal of materials science & Technology 2024年第29期196卷 248-261页

作者： Tongchao Xu Guoliang Hou Haobo Cao Junkai Ma Yulong An Huidi Zhou Jianmin Chen State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Amorphous alloys have attracted much attention in the field of cavitation erosion(CE)due to their good comprehensive ***,due to the special amorphous structures that are difficult to characterize,their micro-response behaviors and damage mechanisms during the CE process have not been well *** this paper,advanced techniques including focused ion beam(FIB)and transmission electron microscope(TEM)were used to comparatively study the microstructure evolution and volume loss rules of Cu_(47.5) Zr_(45.1) Al_(7.4) and Zr_(41.2) Ti_(13.8) Cu_(12.5) Ni_(10) Be_(22.5) bulk metallic glasses(BMG)under the action of cavitation load and cavitation heat to reveal their CE *** results showed that the absence of small atoms in Cu_(47.5) Zr_(45.1) Al_(7.4) led to a large free volume,thereby compromising its hardness,modulus,and yield ***,this also made it more susceptible to shear banding,which in turn enhanced its energy absorption *** Cu_(47.5) Zr_(45.1) Al_(7.4) had a higher glass transition temperature(T_(g))and onset temperature of crystallization(T_(x)),as well as a wider supercooled liquid phase region(△T_(x)),its exothermic peak was obviously pronounced and the transformation temperature range was significantly ***,it is more likely to adaptively form Cu-rich nanocrystals under the action of cavitation ***,the larger free volume in the shear band was conducive to the diffusion of atoms and the occurrence of adaptive nanocrystallization behaviors in Cu_(47.5) Zr_(45.1) Al_(7.4).These nanocrystals were able to effectively force crack deflection,thereby dissipating impact energy and delaying the fatigue spallation of the ***,Cu_(47.5) Zr_(45.1) Al_(7.4) exhibited a far longer incubation period and a noticeably lower cumulative volume loss.

关键词： Amorphous alloy Cavitation erosion Cavitation heat Nanocrystallization Shear band

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