热电效应
兴奋剂
合金
材料科学
电阻率和电导率
热电材料
杂质
声子散射
声子
分析化学(期刊)
凝聚态物理
热导率
化学
物理
冶金
复合材料
光电子学
热力学
有机化学
量子力学
色谱法
作者
Yan Chen,Chao Wang,Zheng Ma,Lanwei Li,Shuyao Li,Jianli Wang
标识
DOI:10.1016/j.cap.2020.09.019
摘要
n-type Mg3Sb2–Mg3Bi2 alloy shows as a potential new thermoelectric material (TE) and has been widely researched recently. The pure phase n-type Mg3·20(Sb0·3Bi0.7)1.99Te0.01 were prepared by adjusting Mg content with the Bi impurity phase being effectively suppressed. Then, Co element was doped into the pure phase and the electrical conductivity of samples were improved. With a high power factor of 20.3 μW cm−1K−2 for Mg3·185Co0·015(Sb0·3Bi0.7)1.99Te0.01 at 525 K. Additionally, it was found that the phonon scattering is enhanced due to the larger atomic mass of Co comparing to Mg and the lattice thermal conductivity is reduced. As a result, a high ZT value of ~ 1.03 at 525 K is achieved for the Mg3·185Co0·015(Sb0·3Bi0.7)1.99Te0.01.
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