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Crystal Structures and Thermoelectric Properties of Sm-Filled Skutterudite Compounds Sm_yFe_xCo_(4-x)Sb_(12)

Journal of Rare Earths 2007年第6期25卷 739-743页

作者：刘桃香唐新峰谢文杰鄢永高张清杰 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Polycrystalline samples of Sm partially filled skutterudites SmyFexCo4-xSb12 were prepared by melting and Spark Plasma Sintering technique. The results of Rietveld refinement showed that the obtained SmyFexCo4-xSb12 samples possessed filled skutterudite structures. The thermal parameter （B） of Sm is larger than that of Sb, Fe, and Co, indicating that Sm ＂rattled＂ in Sb-icosahedron voids. The effects of filling atom Sm on thermoelectric properties of these compounds were investigated. With the increase of Sm filling fraction （y）, electrical conductivity decreased, Seebeck coefficient increased and had a maximum value when y was 0.38; thermal conductivity reduced and had a minimum value when y was 0. 32. At 750 K, the highest figure of merit of 0.68 was obtained for Sm0.32Fe1.47Co2.53Sb12.

关键词： skutterudite compound thermoelectric properties Sm filling rare earths

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Effect of pre-welding condition on liquation cracking characteristics of K439B superalloy laser welding

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Journal of materials Research and technology 2025年 36卷 7950-7962页

作者： Zongli Yi Jiguo Shan Zhenlin Zhang Aiping Wu Yue Zhao State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical Engineering Tsinghua University Beijing 100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Beijing 100084 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China College of Engineering China Agricultural University Beijing 100091 China School of Material Science and Engineering Southwest Jiaotong University Chengdu 610031 China

The liquation cracking is a crucial issue in the fusion welding of γʹ precipitation-strengthened nickel-based superalloys. In this study, the laser welding-induced liquation cracking of the newly developed cast superalloy K439B, and three pre-weld heat treatment conditions, have been investigated. The γʹ phase constitutional liquation and MC carbides constitutional liquation are the universal liquation mechanisms in K439B, and there are γ/γʹ eutectic liquation mechanism and partial incipient melting around η phase in the cast alloy. The pre-weld solution treatment increases the incipient melting temperature of the alloy due to the elimination of γ/γʹ eutectics and η phase. Applying a slower cooling rate after solution treatment changes the morphology and distribution of γʹ phase, softening the base material and increasing its ductility, reducing the cracking susceptibility. The over-aging treatment with the controlled cooling rate of 1 °C/min to 900 °C after solution treatment can suppress the liquation cracking of the K439B and achieve a crack-free laser welding joint.

关键词： Nickel-based superalloy Liquation cracking Laser welding Pre-weld heat treatment

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Rare earth metal oxides as BH_4^--tolerance cathode electrocatalysts for direct borohydride fuel cells

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Journal of Rare Earths 2012年第5期30卷 437-441页

作者：倪学敏王雅东郭峰姚佩潘牧 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Rare earth metal oxides（REMO） as cathode electrocatalysts in direct borohydride fuel cell（DBFC） were *** REMO electrocatalysts tested showed favorable activity to the oxygen electro-reduction reaction and strong tolerance to the attack of BH 4-in alkaline *** simple membraneless DBFCs using REMO as cathode electrocatalyst and using hydrogen storage alloy as anodic electrocatalyst exhibited an open circuit of about 1 V and peak power of above 60 mW/cm *** DBFC using Sm 2 O 3 as cathode electrocatalyst showed a relatively better *** maximal power density of 76.2 mW/cm 2 was obtained at the cell voltage of 0.52 V.

关键词： direct borohydride fuel cell oxygen electro-reduction rare earth oxide membraneless DBFC

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First-principles study on Pr-doped Bilayer Nickelate La3Ni2O7

arXiv

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arXiv 2025年

作者： Huo, Zihao Zhang, Peng Shi, Haoliang Yan, Xiaochun Duan, Defang Cui, Tian Key Laboratory of Material Simulation Methods & Software of Ministry of Education State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun130012 China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi’an Jiaotong University Xi’an710049 China Institute of High Pressure Physics School of Physical Science and Technology Ningbo University Ningbo315211 China

Recently, the Pr-doped Ruddlesden-Popper phase of bilayer nickelate La3Ni2O7 has been reported to exhibit a superconducting transition temperature (Tc) of 82.5 K and superconducting volume fraction of about 57 % at high pressure. However, the effect of Pr-doping on La3Ni2O7 remains unclear. Here, we studied the crystal structures and electronic properties of Pr-doped La3Ni2O7 at 0 and 15 GPa based on the first-principles calculations to explore the doping effect of Pr. Our findings indicate that the praseodymium atoms prefer to occupy the outer La-O layers site. We then investigated the evolution of crystal structures in both the ambient pressure phase and high pressure phase of La3Ni2O7 as a function of doping concentration, revealing inconsistent trends in their evolution with increasing doping levels. Finally, by fitting the bilayer two-orbital model, we propose that doping Pr may benefit for superconductivity of La3Ni2O7. These results not only can help the further experimental search of RP phase nickelate at lower pressure, but also provide helpful guide for understanding the effect of chemical pressure in isovalent doped RP phase nickelate superconductor. Copyright © 2025, The Authors. All rights reserved.

关键词： Superconducting transition temperature

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Organic–inorganic S-scheme heterojunction photocatalysts: Design, synthesis, applications, and challenges

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eScience 2025年第3期5卷

作者： Cheng, Jingzhao Cheng, Bei Xu, Jingsan Yu, Jiaguo Cao, Shaowen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Hubei Technology Innovation Center for Advanced Composites Wuhan University of Technology Wuhan 430070 China School of Chemistry and Physics Queensland University of Technology Brisbane QLD Australia Laboratory of Solar Fuel Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 430078 China

Since the concept was introduced in 2019, step-scheme (S-scheme) heterojunctions have emerged as an important subclass of heterojunction technology and attracted much attention for solar energy conversion. S-scheme heterojunctions are capable of maximizing redox ability through conferring enhanced photocatalytic performance by addressing the problem of rapid electron–hole recombination. In particular, the organic–inorganic S-scheme heterojunction (OI-SHJ) can integrate atomic long-range ordered inorganic semiconductors with tailored organic materials using diverse organic molecular building blocks and integration methods, offering brilliant prospects for innovation. Here, we review the state-of-the-art progress in OI-SHJ photocatalysts by introducing their charge transfer mechanism, design criteria, preparation approaches, and applications. We also highlight the synergistic role of organic and inorganic materials in S-scheme heterojunctions and what is understood so far about their structure–activity relationship. We conclude by summarizing the existing challenges and emphasizing the current outlook for the future development of OI-SHJ photocatalysts. © 2024 The Authors

关键词： Energy conversion Organic–inorganic Photocatalysis S-scheme

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Full-Scaling Friction and Wear Laws of Nanotwinned Metals

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Physical Review Letters 2025年第16期134卷 166201-166201页

作者： Yan Lin Ziyue Zhang Fenghui Duan Fangming Wang Fei Liang Qicheng Zhang Yong Li Jie Pan Keke Chang Yonghao Zhao Yuntian Zhu Xiang Chen Nano and Heterogeneous Materials Center School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing China Department of Materials Science and Engineering City University of Hong Kong Hong Kong China State Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo China State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan China School of Materials Science and Engineering Hohai University Changzhou China

Ultrastrong nanotwinned (NT) metals hold promise for mitigating friction and wear—essential for enhancing the energy efficiency and longevity of all moving systems. However, optimizing their tribological performance has long suffered from the absence of friction and wear laws across varying tribological loading scales. Here, we have discovered full-scaling twin lamella spacing (λ)-dependent friction and wear laws in NT pure nickel and identified critical deformation mechanisms for reducing friction and wear. Nanoscale friction initially increases with decreasing λ, peaking at 20 nm, and then decreases due to a transition from dislocation-twin boundary interactions to detwinning. Under microscale loading, friction and wear reduce linearly with decreasing λ, attributed to an unforeseen phase transition from face-centered cubic to hexagonal close-packed structures. Furthermore, under macroscale loading, the formation of a durable oxide layer and a stable gradient nanostructure in nanotwinned nickel with λ exceeding 20 nm aids in mitigating wear loss.

关键词： Nickel

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Fabrication of laminated TiB2-B4C/Cu-Ni composites by electroplating and spark plasma sintering

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Journal of materials Science & technology 2017年第10期33卷 1172-1176页

作者： Ziyi Wu Jinyong Zhang Taojie Shi Fan Zhang Liwen Lei Han Xiao Zhengyi Fu State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

We proposed a new method, electroplating followed by spark plasma sintering（SPS）, to fabricate laminated TiB2-B4 C/Cu-Ni composites with high strength and high toughness. It is found that a thin intermediate Cu layer can effectively enhance the strength of the interface between the ceramics and the metals, resulting in a high flexural strength and toughness of the laminated TiB2-B4 C composites simultaneously. A flexural strength and fracture toughness of 651 MPa and 11.6 MPam^（1/2） respectively,are achieved, an approximately 90% improvement over TiB2-B4 C bulk.

关键词： Laminated structure Electroplating Spark plasma sintering B4C ceramic

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synthesis and structure of NaNbO_3 ceramic powders in ultrahigh pressure field

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Science China(Technological Sciences) 2007年第5期50卷 658-663页

作者： CAO MingHe TIAN Wei LI MingFa SUN WenHua HU MingJi LIU HanXing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The NaNbO3 powders were synthesized and their crystal structure changes were analyzed by ultrahigh pressure up to 6 *** results indicate that the pure NaNbO3 powders can be synthesized at 300℃ under a pressure of 4 GPa, to sig- nificantly restrain the Na element volatilization compared with the traditional syn- thesis method. It is found that the crystal structure of synthesized NaNbO3 changes from low symmetry to high symmetry with the increase of the pressure.

关键词： pressure synthesis, NaNbO3 powder, crystal structure

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Preparation of Layered Potassium Titanate Whiskers with Large Length-diameter Ratio by KDC Method

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Journal of Wuhan University of technology(materials Science) 2014年第4期29卷 669-673页

作者：吉晓莉 WU Shijiang 章嵩 ZHAO Xiujian State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

Pure K2Ti4O9 whiskers were prepared by KDC（Kneading-Drying-Calcination） method with TiO2 and K2CO3 as raw materials. The influences of TiO2/K2CO3 molar ratio（RT/K）, calcination temperature（TC） and cooling process on phase composition and morphology of the whiskers were investigated by TG-DSC（thermo gravimetric-differential scanning calorimeter）, XRD（X-ray diffraction）, and SEM（scanning electron microscope）. Pure K2Ti4O9 potassium titanate whiskers with large length-diameter ratio（r）（over 250） can be obtained at RT/K = 2.9 and TC = 950 ℃.

关键词： KDC(kneading-drying-calcination) method potassium titanate whiskers TiO2/K2CO3 molar ratio(RT/K) length-diameter ratio(r)

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Interlocking Strategy Confined in Multifunctional Rubber-Based Composites for Boosting Anti-Corrosion and Electromagnetic Interference Shielding

SSRN

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SSRN 2025年

作者： Sun, Jiahao Chen, Jianing Gao, Zhenliang Li, Yang Liu, Chuntai Li, Muhe Liu, Xianhu Shen, Changyu State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial Equipment National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou University Zhengzhou450002 China College of Material Science and Engineering Zhengzhou University Zhengzhou450001 China Zhengzhou University China

Addressing the corrosion issues arising from incorporating highly conductive fillers into the rubber matrix remains a significant challenge, particularly in the harsh marine corrosion environment and under the threat of early warning radar detection. Inspired by the principles of interface engineering in composites, an interlocking strategy for regulating the multiple interfacial interactions (including dipole-dipole, electrostatic and chemical bonding) between methyl vinyl silicone rubber (VMQ) and metal nanoparticles is proposed. This modification facilitates molecular conformational transformation and ordering within the VMQ-based composite, thereby inducing stable dipole distribution of silicone rubber at the composite interface. Consequently, this significantly enhanced the crosslinking degree of rubber vulcanization and interfacial adhesion between the filler and matrix. Compared to conventional rubber-based composites, the engineered VMQ/Ag@Al/ MWCNTs composite maintained an electromagnetic interference (EMI) shielding effectiveness exceeding 100 dB after a 240-hour copper accelerated salt spray (CASS) test. Furthermore, the modified rubber matrix composite exhibits a breaking strength of 2.5 MPa and an elongation at break of 120%, significantly higher than that of pure silicone rubber with a breaking strength of only 0.43 MPa. Additionally, the VMQ/Ag@Al/MWCNTs composite avoids a series of issues, including complex molecular orientation, interface instability, and performance degradation due to structural relaxation following 240-hour post-treatments such as ultraviolet aging, and high temperature and humidity. The findings offer a novel approach for multi-scale interface control, enhancing the performance and functional applications of rubber matrix composites. © 2025, The Authors. All rights reserved.

关键词： Seawater corrosion

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