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Revealing the low thermal conductivity of high-entropy rare-earth tantalates via multi-scale defect analysis

Journal of Advanced Ceramics 2023年第11期12卷 2087-2100页

作者： Jun Wang Qianqian Jin Jianbo Song Di Zhang Bin Xu Zhiyi Ren Meng Wang Shixiao Yan Xiaoliang Sun Chi Liu Xiaoyu Chong Jing Feng Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Materials Science and Engineering Research Center Guangxi University of Science and TechnologyLiuzhou 545006China Shanghai Electro–Mechanical Engineering Institute Shanghai 201109China Shanghai Spaceflight Precision Machinery Institute Shanghai 201109China

Thermal barrier coating(TBC)materials can improve energy conversion efficiency and reduce fossil fuel ***,novel rare earth tantalates RETaO_(4),as promising candidates for TBCs,were reassembled into multi-component solid solutions with a monoclinic structure to further depress thermal conductivity via an entropy *** formation mechanisms of oxygen vacancy defects,dislocations,and ferroelastic domains associated with the thermal conductivity are demonstrated by aberration-corrected scanning transmission electron *** to single-RE RETaO_(4)and 8YSZ,the intrinsic thermal conductivity of(5RE1/5)TaO4 was decreased by 35%–47%and 57%–69%at 1200℃,respectively,which is likely attributed to multi-scale phonon scattering from Umklapp phonon–phonon,point defects,domain structures,and dislocations.r¯3+RE/r5+Ta and low-temperature thermal conductivity are negatively correlated,as are the ratio of elastic modulus to thermal conductivity(E/κ)and high-temperature thermal ***,the high defects’concentration and lattice distortion in high-entropy ceramics enhance the scattering of transverse-wave phonons and reduce the transverse-wave sound velocity,leading to a decrease in the thermal conductivity and Young’s *** addition,5HEC-1 has ultra-low thermal conductivity,moderate thermal expansion coefficients,and high hardness among three five-component high-entropy ***,5HEC-1 with superior thermal barrier and mechanical properties can be used as promising thermal insulating materials.

关键词： thermal barrier coating(TBC) entropy strategy oxygen vacancy dislocation ferroelastic domains intrinsic thermal conductivity

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An organic-inorganic hybrid thermochromic ferroelastic with multi-channel switches

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中国化学快报:英文版 2023年第9期34卷 305-309页

作者： Yipiao Zeng Junchao Liu Lin Zhou Xin Deng Wenli Yang Xin Yan Yanling Luo Xuan Zhu Xiaoyun Huang Xianjiang Song Yuanyuan Tang Ordered Matter Science Research Center and School of Chemistry and Chemical Engineering Nanchang UniversityNanchang 330031China

Multifunctional switchable materials are attracting tremendous interest because of their great application potential in signal processing,information encryption,and smart ***,we reported an organic-inorganic hybrid thermochromic ferroelastic crystal,[TMIm][CuCl_(4)](TMIm=1,1,3,3-tetramethylimidazolidinium),which undergoes two reversible phase transitions at 333 K and 419 K,***,these three phases experience a remarkable ferroelastic-paraelastic-ferroelastic(2/m-mmm-2/m)transition,which remains relatively unexplored in ***,the ferroelastic domains can be simultaneously switched under temperature and stress ***,[TMIm][CuCl_(4)]exhibits thermochromic phenomenon,endowing it with extra spectral encryption possibilities during information *** with dielectric switching behavior,[TMIm][Cu Cl_(4)]are promising for practical applications in memory devices,next-generation sensors,and encryption technology.

关键词： Organic-inorganic hybrid compounds ferroelastic domains Thermochromism Multi-channel switches Bistability

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A Different Approach to High-Tc Superconductivity: Indication of Filamentary-Chaotic Conductance and Possible Routes to Room Temperature Superconductivity

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World Journal of Condensed Matter Physics 2016年第3期6卷 244-260页

作者： Hans Hermann Otto Materialwissenschaftliche Kristallographie Clausthal University of Technology Clausthal-Zellerfeld Lower Saxony Germany

The empirical relation of between the transition temperature of optimum doped superconductors Tco and the mean cationic charge , a physical paradox, can be recast to strongly support fractal theories of high-Tc superconductors, thereby applying the finding that the optimum hole concentration of σo = 0.229 can be linked with the universal fractal constant δ1 = 8.72109… of the renormalized quadratic Hénon map. The transition temperature obviously increases steeply with a domain structure of ever narrower size, characterized by Fibonacci numbers. However, also conventional BCS superconductors can be scaled with δ1, exemplified through the energy gap relation kBTc ≈ 5Δ0/δ1, suggesting a revision of the entire theory of superconductivity. A low mean cationic charge allows the development of a frustrated nano-sized fractal structure of possibly ferroelastic nature delivering nano-channels for very fast charge transport, in common for both high-Tc superconductor and organic-inorganic halide perovskite solar materials. With this backing superconductivity above room temperature can be conceived for synthetic sandwich structures of less than 2+. For instance, composites of tenorite and cuprite respectively tenorite and CuI (CuBr, CuCl) onto AuCu alloys are proposed. This specification is suggested by previously described filamentary superconductivity of “bulk” CuO1﹣x samples. In addition, cesium substitution in the Tl-1223 compound is an option.

关键词： Superconductivity Fractals Chaos Feigenbaum Numbers Fibonacci Numbers Golden Mean ferroelastic domains Mean Cationic Charge Perovskites Cuprates Tenorite Cuprite Cesium Substitution Solar Power Conversion Efficiency

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