Sn和Te掺杂对CrSb<sub>2</sub>热电性能的不同影响

材料研究学报

2010, Vol. 24

Issue (4): 429-433

研究论文

本期目录 | 过刊浏览

Sn和Te掺杂对CrSb₂热电性能的不同影响

李海金, 张清, 刘义, 孙文斌

安徽工业大学数理学院马鞍山 243032

The Different Effect of Sn and Te Substitution for Sb on Thermoelectric Properties of CrSb2

LI Haijin, ZHANG Qing, LIU Yi, SUN Wenbin

School of Mathematics and Physics, Anhui University of Technology, Ma’anshan 243002

引用本文:

李海金张清刘义孙文斌. Sn和Te掺杂对CrSb₂热电性能的不同影响[J]. 材料研究学报, 2010, 24(4): 429-433.
, , , . The Different Effect of Sn and Te Substitution for Sb on Thermoelectric Properties of CrSb2[J]. Chin J Mater Res, 2010, 24(4): 429-433.

全文: PDF(1018 KB)

摘要:

研究了Sn、Te掺杂对CrSb₂热电性能的不同影响。结果表明, Sn、Te掺杂引起的晶格畸变使电子浓度提高, Te替代Sb是n--型掺杂, 而Sn替代Sb是p--型掺杂。由于补偿效应, CrSb _1.99Sn _0.01的电子浓度小于CrSb _1.99 Te _0.01的电子浓度, 导致Sn掺杂使CrSb₂的电阻率和热电势|S|降低的幅度较小。掺杂后声子杂质(Sn、Te)散射增强, CrSb _1.99 Sn _0.01和CrSb _1.99 Te _0.01的热导率都明显减小, 而Te的原子量比Sn的大, 散射作用更强, 热导率减小的幅度更加明显。因此, Te掺杂改善了CrSb₂的热电性能, 而Sn掺杂没有改善其性能。此外, 由于Sn和Te的d轨道填满了电子而没有磁性, 掺杂后样品的Neel温度没有明显改变。

关键词 ：材料科学基础学科 , CrSb₂, 电阻率 , 热电势 , 热导率

Abstract：

The different effect of Sn and Te substitution for Sb on thermoelectric properties of CrSb2 was investigated. The results show that the effect of lattice distortion after doping leads to the increase in the electron concentration of CrSb2. The substitution of Sn and Te for Sb can be regarded as p–doping and n–doping, respectively, the electron concentration of CrSb1.99Sn0.01 is smaller than that of CrSb1.99Te0.01 due to the compensation effect, leading to lesser decrease of resistivity and the absolute value of thermopower |S| for Sn doping than that of Te doping. Thermal conductivity of CrSb1.99Sn0.01 and CrSb1.99Te0.01 decreased after doping, which can be attributed to the enhancement of the phonon
scattering by impurity (Sn and Te, respectively) atoms, the atomic mass of Te is greater than that of Sn, the phonon scattering by impurity atoms is stronger, resulting in the more decrease of thermal conductivity for Te doping. As a result, the thermoelectric properties of CrSb2 was improved by Te doping, however, Sn doping did not meet the purpose of improving the performance of CrSb2. In addition, the Neel temperature does not change much after doping, which can be attributable to non-magnetic feature with full 3d orbits for Sn and Te.

Key words： foundational discipline in materials science CrSb2 resistivity thermo-power thermal conductivity

收稿日期: 2010-04-15

ZTFLH:

O482

基金资助:

国家自然科学青年基金50701043资助项目。

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https://www.cjmr.org/CN/ 或 https://www.cjmr.org/CN/Y2010/V24/I4/429

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