稀土元素对Bi_2Te_3基材料热电性能的影响一直是Bi_2Te_3基热电材料研究的热点.本文研究了不同Gd掺杂量Bi_2Te_3基热电材料的热压烧结工艺参数,运用XRD,SEM方法对材料的物相成分和形貌进行了表征,研究了20MPa下不同Gd掺杂对Bi_2Te_3基材料的载流子浓度、电导率、Seebeck系数的影响.研究结果表明,Gd掺杂没有明显改变Bi_2Te_3基材料的晶体结构,适量的Gd掺杂有利于减小载流子浓度、提高Bi_2Te_3基材料的热电性能.
The effects of rare earth elements on thermoelectric performances of Bi_2Te_3-based thermoelectric materials have always been hot topics. Here the hot-pressure sintering parameters versus different Gd dopants into Bi_2 Te_3-hased thermoelectric materials were studied. The composition and morphology were characterized by XRD and SEM analysis. The influences of different amounts of Gd dopants on the carrier concentration, electrical conductivity, and seebeck coefficient of Bi_2Te_3-based materials were studied. The results show that, Gd-dopant do not change the crystal structure of Bi_2Te_3-based materials evidently. An appropriate amount of Gd dopant is conducive to reducing the carrier concentration and improving the thermoelectric properties of Bi_2Te_3-based materials.
参考文献
| [1] | Ni HL;Zhu TJ;Zhao XB .Thermoelectric properties of hydrothermally synthesized and hot pressed n-type Bi2Te3 alloys with different contents of Te[J].Materials Science & Engineering, B. Solid-State Materials for Advanced Technology,2005(2):119-122. |
| [2] | Hugh W. Hillhouse;Mark T. Tuominen .Modeling the thermoelectric transport properties of nanowires embedded in oriented microporous and mesoporous films[J].Microporous and Mesoporous Materials,2001(1):39-50. |
| [3] | Chaput L;Pecheur P;Tobola J;Scherrer H .Transport in doped skutterudites: Ab initio electronic structure calculations[J].Physical review, B. Condensed matter and materials physics,2005(8):5126-1-5126-11-0. |
| [4] | 陈柔刚 .n型Bi<,2>Te<,3>系热电材料成型与性能研究[D].华中科技大学,2005. |
| [5] | 蒋俊,许高杰,崔平,陈立东.TeI4掺杂量对n型Bi2Te3基烧结材料热电性能的影响[J].物理学报,2006(09):4849-4853. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%