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="ChDivSummary">A "reaction-extrusion process" has been developed to prepare Zn4Sb3 bulk materials with high thermoelectric performance.The synthesis,densification,and shape-forming of Zn4Sb3 bulk materials... to enhance thermoelectric performance.The extruded Zn4Sb3 materials exhibited excellent thermoelectric performance,for example,the dimensionless thermoelectric figure of merit is 1.77 at 623 K,which is 36......
急冷甩带对Bi2Te2.7Se0.3热电材料微观结构与电性能的影响 陈晖1,褚颖1,魏少红1,王忠1 (1.北京有色金属研究总院能源材料与技术研究所,北京,100088) 摘要:采用急冷甩带法和放电等离子体烧结(SPS)制备得到了块体Bi2Te2.7Se0.3热电材料,在室温下测量其热电性能,Seebeck系数最高达到-139.33μV·K-1,功率因子也有所提高,最大值1.71×103w·m-1·K-2,计算得到最大热电优值0.421.材料经急冷甩带后,微观组织结构发生变化,内部缺陷增多,晶粒细化,改变了载流子的散射机制,增强了声子散射.虽然电导率有一定程度减小,但Seebeck系数增......
热电材料的研究和发展方向 徐桂英1,葛昌纯1 (1.北京科技大学无机非金属材料系特陶中心,北京,100083) 摘要:讨论了热电材料研究与发展的最新方向,阐述了单体和梯度热电材料的基本理论和正在进行的研究热点及其所遵循的基本原则. 关键词:热电材料; 研究; 发展; 方向; [全文内容正在添加中] ......
Sb掺杂对Mg2Si基化合物热电性能的影响 张倩1,殷浩1,朱铁军1,赵新兵1 (1.浙江大学,硅材料国家重点实验室,浙江,杭州,310027) 摘要:采用感应熔炼和真空热压的方法制备了Sb掺杂和未掺杂的Mg2Si基热电材料.研究了Sb掺杂对Mg2Si基热电材料的结构以及热电特性的影响.结果表明:通过Sb掺杂使得载流子浓度从3.07x1019 cm-3增加到1.25x1020 cm-3,电子有效质量也相应增加.测试了从室温到800 K下试样的Seebeck系数,电导率和热导率.结果显示,0.3 at%Sb掺杂使得电导率得到显著增加,在783 K时,ZT值达到0.7. 关键词:热电; 金属间化合物; 掺杂; thermoelectric; intermetallic alloys and compounds; doping; [全文内容正在添加中] ......
of thermoelectric materials. Herein, we report the effects of Sm and S co-doping on thermoelectric transport properties of copper antimony selenides in the temperature range of300 K < T < 650 K... increase point defect scattering of heat-carrying phonons,leading to a lower thermal conductivity and a better thermoelectric performance. The highest figure of merit(ZT)of ~0.55 at 648 K is obtained......
STUDY ON THE STRUCTURE AND PROPERTIES OF SEMICONDUCTOR CERAMIC COOLING MATERIALS崔万秋,程浩摘 要:<正> In this paper,thermoelectric polycrystalceramic... materials have an inhomo-geneous structure,higher mechanical strengthand the thermoelectric properties.With the helpof phase diagrams,Differantial Thermal Anal-ysis,X-Ray diffractogranis......
STUDY ON THE STRUCTURE AND PROPERTIES OF SEMICONDUCTOR CERAMIC COOLING MATERIALS崔万秋,程浩摘 要:<正> In this paper,thermoelectric polycrystalceramic... materials have an inhomo-geneous structure,higher mechanical strengthand the thermoelectric properties.With the helpof phase diagrams,Differantial Thermal Anal-ysis,X-Ray diffractograms......
Se AND Bi SUBSTITUTION EFFECT IN Sb2Te3张建摘 要:<正>The Discrete Variational Xa Method DVXa with an embeded cluster scheme was used to investigate electronic structure, energy levels, charge distribution and chemical bonding in p-type thermoelectric ceramics:Sb2Te3-Bi2Te3-Sb2Se3. The results obtained are in agreement with experiment ones, which......
高压合成纳米晶Bi0.85Sb0.15的低温热电性 刘华军1,宋春梅3,蔡方硕1,李来风1,黄荣进1 (1.中国科学院理化技术研究所,北京,100080;2.中国科学院研究生院,北京,100039;3.遵义师范学院物理系,遵义,563002) 摘要:通过机械合金化法获得Bi0.85Sb0.15纳米晶粉末材料,在常温下冷压成型并分别在不同温度下进行高压处理,制备出块状样品.X-ray衍射实验证实已形成了Bi0.85Sb0.15单相合金.测量了样品在80~300 K温区的Seebeck系数和电导率,计算出材料的功率因子与温度的关系.在523 K 6 GPa下压制30 min的样品,其Seeb......
梯度热电材料的优化设计及研究进展 朱文1,杨君友1,张同俊1,鲍思前1,李守林1,樊希安1 (1.华中科技大学模具技术国家重点实验室,武汉,430074) 摘要:将2种不同的单体材料连接起来,制备成梯度结构热电材料(FGTM),不仅能扩大材料的应用温区,而且能极大地提高材料的热电转换效率.介绍了梯度热电材料优化设计的理论基础及方法,综述了梯度热电材料的研究进展及应用前景. 关键词:梯度热电材料; 优化设计; 应用; [全文内容正在添加中] ......
