Introduction of porous structure:A feasible and promising method for improving thermoelectric performance of Bi_2Te_3 based bulks

查看全文 作　　者：Jie [1,2]Hu;Xi’An [1,2]Fan;Chengpeng [1,2]Jiang;Bo [1,2]Feng;Qiusheng [1,2]Xiang;Guangqiang [1]Li;Zhu [1,2]He;Yawei [1,2,3]Li

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology;[2]Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology;[3]National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology,Wuhan University of Science and Technology

出　　处：《Journal of Materials Science & Technology》索引2018年第34卷第12期,共6页

基　　金：supported financially by the National Natural Science Foundation of China(Nos.11074195 and 51674181);the Key Projects of Hubei Provincial Department of Education(No.D20151103) 摘　　要：The porous p-type Bi_(0.4)Sb_(1.6)Te_3 bulks containing irregularly and randomly oriented pores were obtained by artificially controlling the relative density of sintered samples during resistance pressing sintering process. It is demonstrated that the thermoelectric performances are significantly affected by the porous structure, especially for the electrical and thermal conductivity due to the enhanced carrier scattering and phonon scattering. The increasing porosity resulted in the obvious decrease in electrical and thermal conductivity, and little change in Seebeck coefficients. It is encouraging that the reduction of thermal conductivity can compensate for the deterioration of electrical performance, leading to the enhancement in thermoelectric figure of merit(ZT). The maximum ZT value of 1.0 was obtained for the sample with a relative density of 90% at 333 K. Unfortunately, the increase in porosity also brought in obvious degradations in Vickers hardness from 51.71 to 27.74 HV. It is worth mentioning that although the Vickers hardness of the sample with a relative density of 90% decreased to 40.12 HV, it was still about twice as high as that of the zone melting sample(21.25 HV). To summarize, introducing pores structure into bulks properly not only enhances the ZT value of Bi_2Te_3 based alloys, but also reduces the use of raw materials and saves production cost. 关键词：THERMOELECTRIC materials POROUS structure BI2TE3 Thermal CONDUCTIVITY VICKERS HARDNESS

相关文献

参考文献（38）
引证文献（1）
耦合文献（0）

参考文献(38)

引证文献(1)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Introduction of porous structure:A feasible and promising method for improving thermoelectric performance of Bi_2Te_3 based bulks

参考文献(38)

引证文献(1)

用户提示