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1Approaching the minimum lattice thermal conductivity of p-type SnTe thermoelectric materials by Sb and Mg alloying显示文摘SnTe, as the nontoxic analogue to high-performance PbTe thermoelectric material, has captured the worldwide interest recently. Many triumphant instances focus on the strategies of band convergence, resonant doping, and nano-precipitates phonon scattering. Herein, the p-type SnTe-based materials Sn0.85-xSb0.15MgxTe (x=0-0.10) are fabricated and a combined effect of Sb and Mg is investigated. Sb alloying tunes the hole carrier concentration of SnTe and decreases the lattice thermal conductivity. Mg alloying leads to a nearly hundredfold rise of disorder parameter due to the large mass and strain fluctuations, and as a consequence the lattice thermal conductivity decreases further down to ~0.64Wm^-1K^-1 at 773K, close to the theoretical minimum of the lattice thermal conductivity (~0.50Wm^-1K^-1) of SnTe. In conjunction with the enhancement of the Seebeck coefficient caused by band convergence due to Mg alloying, the maximum zTmax reaches ~1.02 and the device zTdevice of ~0.50 at 773K for Sn0.79Sb0.15Mg0.06Te, suggesting this SnTe-based composition has a promising potential in intermediate temperature thermoelectric applications.Tiezheng Fu Jiazhan Xin Tiejun Zhu Jiajun Shen Teng Fang Xinbing Zhao 2019Science Bulletin2019,64,14:5
2Synthesis and thermoelectric properties of Rashba semiconductor BiTeBr with intensive texture显示文摘Bismuth tellurohalides with Rashba-type spin splitting exhibit unique Fermi surface topology and are developed as promising thermoelectric materials. However,BiTeBr, which belongs to this class of materials, is rarely investigated in terms of the thermoelectric transport properties. In the study, polycrystalline bulk BiTeBr with intensive texture was synthesized via spark plasma sintering(SPS). Additionally, its thermoelectric properties above room temperature were investigated along both the inplane and out-plane directions, and they exhibit strong anisotropy. Low sound velocity along two directions is found and contributes to its low lattice thermal conductivity. Polycrystalline BiTeBr exhibits relatively good thermoelectric performance along the in-plane direction,with a maximum dimensionless figure of merit(ZT) of 0.35 at 560 K. Further enhancements of ZT are expected by utilizing systematic optimization strategies.Jia-Zhan Xin Chen-Guang Fu Wu-Jun Shi Guo-Wei Li Gudrun Auffermann Yan-Peng Qi Tie-Jun Zhu Xin-Bing Zhao Claudia Felser 2018Rare Metals2018,37,4:2
3拉曼光谱定义SbCrSe_(3)单晶的振动模式对称性和声子非谐性显示文摘本文报道了SbCrSe_(3)单晶的合成方法及其在2–300 K温度范围内的热输运性能.通过角分辨偏振拉曼光谱技术、群论和理论计算分析,我们首次定义了该晶体沿(00l)解理面的拉曼振动模式对称性,并可利用其某些模式确定晶体轴向.另外,通过原位变温拉曼光谱和理论计算相结合的方式,分析得出三声子散射过程即可准确地描述晶格热导率对温度的依赖关系.本文从一个全新的角度揭示了SbCrSe_(3)的热输运性质,为研究其他低维材料热性能提供了有力借鉴.吴宏 公祥南 彭义 张龙 张斌 彭坤玲 刘杰 韩广 王爱峰 柴一晟 何明全 顾豪爽 Emmanuel Guilmeau 王国玉 卢旭 周小元 2021Science China Materials2021,64,11:0
4铜硫热电材料研究进展显示文摘热电材料是一种能够实现电能和热能相互转化的新型清洁能源材料。Cu-S族热电材料由于具有成本低、环境友好、低热导率等性能特征而受到广泛关注。本文主要介绍了Cu-S族化合物的晶体结构特征,重点阐述了提高热电性能的研究方法,为Cu-S族热电材料能够应用于能源领域提出基础问题和理论指导。郭利奎 郑丽君 赵嘉亮 张鑫 滕笑语 2019辽宁科技大学学报2019,42,2:0
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