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electron microscopy.The electrical resistivities and Seebeck coefficients of those samples were measured in the temperature range of 300-723 K,and the samples of SmxCo4Sb12 showed n-type conduction.The Seebeck coefficient in absolute value of SmxCo4Sb12 increased with an increase of temperature and decreased with an increase of x.Among all the samples,Sm0.5Co4Sb12 showed the highest power factor......
a solid-state reaction followed by suitable cooling,annealing,grinding,and spark plasma sintering(SPS) densification processes.For samples with x=0.2,0.4,0.5,0.6,0.8,the electrical conductivity,Seebeck... the thermal conductivity at low temperature,while the electrical resistivity and the Seebeck coefficient in the compounds were found to increase with increasing Ca concentration.As a result,the dimensionless......
, the electrical conductivity, Seebeck coefficient, and thermal conductivity were performed as a function of temperature from 300 to 650 K. It was found that chemical substitution of Mn failed to optimize... despite the fact that it enlarged the Seebeck coefficient and reduced the thermal conductivity synchronously.关键词:......
proved the metallic nature of these compounds. Post-DFT(BoltzTraP) calculations were carried out to explore their thermoelectric properties like electrical conductivities. Seebeck coefficient, electronic thermal conductivities and figure of merit. The highest Seebeck coefficient and figure of merit were found for YbAu among these compounds which are 105 μV/K and 0.285 respectively. All......
for Ca2+ simultaneously increased the Seebeck coefficient and reduced the thermal conductivity.The latter was attributed to the increase in lattice anharmonicity,structural distortion,and grain boundary area,which enhanced the phonon scattering.Ca2.7Y0.3Co4 O9+δ showed the largest dimensionless figure-of-merit(ZT=0.194) at 1073 K because it had the largest Seebeck coefficient and the lowest thermal......
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Bi0.5Sb1.5Te3/聚苯胺复合材料的制备及电学性能 周邦昌1,朱铁军1,胡淑红1,赵新兵1 (1.浙江大学硅材料国家重点实验室) 摘要:用机械共混法制备了Bi0.5Sb1.5Te3/聚苯胺复合材料,测量了材料的电学性能参数.与Bi0 5Sb1.5Te3相比,复合材料的Seebeck系数略有下降在290~300K温区内,复合材料的电导率随材料中聚苯胺含量的增加呈线性下降趋势.在室温下,聚苯胺加入量(质量分数)为2%的复合材料,其功率因子比Bi0.5Sb1.5Te3的低约30%. 关键词:Bi0.5Sb1; 5Te3; 聚苯胺; 无机/有机复合材料; 热电性能; [全文内容正在添加中] ......
MA-SPS制备高热电性能p型(Bi,Sb)2Te3合金块体 卫群1,张久兴1,李佳1,路清梅1,张忻1 (1.北京工业大学,材料学院,新型功能材料教育部重点实验室,北京,100022) 摘要:机械合金化与放电等离子烧结技术(SPS)相结合制备了p型(Bi,Sb)2Te3合金块体.在300~423K的温度范围内测试了样品的电导率﹑Seebeck系数和热导率.系统研究了球磨时间对合金化与热电性能的影响.球磨2h的样品具有最低的热导率,因此其ZT值最高,在323K时为1.16,在373K达到最大值1.23. 关键词:热电材料; 机械合金化; 放电等离子烧结(SPS); [全文内容正在添加中] ......
快速凝固β-FeSi2半导体的热电性能 周邦昌1,朱铁军1,邬震泰1,胡淑红1,赵新兵1 (1.浙江大学,) 摘要:研究了由快速凝固粉烧结制备的p型Fe0.925Mn0.075Si2-0.17%(质量分数)Cu样品的热电性能随温度的变化.X射线衍射分析表明,快速凝固粉由α相和ε相组成.烧结样品800℃退火21h后,完全转变为β半导体相.烧结时间对β-Fe-Si2合金的热电性能有较大的影响,烧结时间越长,Seebeck系数和电阻率越小. 关键词:β-FeSi2; 热电材料; 热电性能; [全文内容正在添加中] ......
SPS法制备AgSb1-xGaxTe2(x=0~0.2)的微结构和热电性能 于磊1,陈东勇1,应鹏展1,崔教林2,鲍宇峰2 (1.中国矿业大学,江苏,徐州,221116;2.宁波工程学院,浙江,宁波,315016) 摘要:采用放电等离子烧结技术(SPS)制备了AgSb1-xGaxTe2 (x=0~0.2),并研究其微结构和热电性能.结果表明:AgSb1-xGaxTe2具有与AgSbTe2相同的晶体结构,并形成了第二相AgGaTe2;掺Ga后,合金的Seebeck系数高于未掺Ga的参照样品AgSbTe2,热导率也低于AgSbTe2;在375 K时,摩尔分数x为0.1的合金AgSb0.9Ga0.1Te2的最大ZT值达到0.29,比AgSbTe2约高0.08. 关键词:放电等离子烧结(SPS); AgSb1-xGaxTe2; 微结构; 热电性能; [全文内容正在添加中] ......
