项目名称: 氧硫组元素化物LnCuChO(Ln:Bi、La;Ch:S、Se、Te)的微结构调控及其热电传输机理研究
项目编号: No.51302140
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 一般工业技术
项目作者: 李甫
作者单位: 清华大学
项目金额: 25万元
中文摘要: 热电材料在新能源技术领域具有重要应用价值。开展对热电材料的研究对能源资源的充分利用、低碳社会的建设和国家可持续发展战略的需求都有很强的现实意义。本课题基于氧化物热电材料良好的环境兼容性、物化稳定性和简单的制备工艺,从目前影响氧化物热电材料性能的主要因素出发,选择研究较少、但具有很大热电潜力的、具有复杂晶体结构的氧硫组元素化物LnCuChO(Ln:Bi、La;Ch:S、Se、Te)为研究对象,系统深入的研究其本征热电传输机制和微观结构对性能的影响规律,旨在为寻求高性能氧化物热电材料提供重要的实验数据和理论依据。在揭示该化合物块体材料本征电热传输性能的基础上,重点探索微观结构对样品热电性能的影响规律。通过织构化技术、纳米结构复合调控材料的热电性能。最后尝试掺杂并优化掺杂量,调节样品载流子浓度,提高其热电优值,从而研发出新型高效的氧化物热电材料。
中文关键词: 氧硫族化合物;热电性能;机械合金化;掺杂;微观结构
英文摘要: Thermoelectric materials have important applications in the field of new energy technology. Carrying out the study of thermoelectric materials will have an important effect on better utilization of energy resources, the construction of low-carbon society and the needs of national sustainable development strategy. Oxide thermoelectric materials have received increasing attention because of their good environmental compatibility, thermal and chemical stability and simple preparation process. Based on the main factors influence on the properties of oxide thermoelectric materials, this topic chooses the oxyselenides LnCuChO (Ln: Bi, La, Ch, S, Se, Te) with complex crystal structure, which show large thermoelectric potential, as the research object . The intrinsic electrical and thermal transport of the pure phase LnCuChO (Ln: Bi, La, Ch, S, Se, Te) compounds will be studied systemically with an emphasis on the influence of the microstructure, which will provide important experimental evidence and theoretical guidelines for seeking for the high performance oxide thermoelectric materials. Then the thermoelectric properties of the compounds will be tried to improve by texture technology, nano structure composite and doping with a aim to developing a new type oxide thermoelectric materials with high thermoelectric perfo
英文关键词: oxyselenides compound;thermoelectric property;mechanical alloying;doping;microstructure