Short and long range order of Half-Heusler phases in (Ti,Zr,Hf)CoSb thermoelectric compounds

被引：32

作者：

Rausch, Elisabeth ^{[1
]}

Castegnaro, Marcus Vinicius ^{[2
]}

Bernardi, Fabiano ^{[2
]}

Alves, Maria C. Martins ^{[3
]}

Morais, Jonder ^{[2
]}

Balke, Benjamin ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Analyt & Inorgan Chem, D-55099 Mainz, Germany

[2] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil

[3] Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil

来源：

ACTA MATERIALIA | 2016年 / 115卷

关键词：

EXAFS; Half-Heusler compounds; Thermoelectric materials; Phase-separation; TRANSPORT-PROPERTIES; CO; ALLOYS; CO2TISN; DENSITY; CO2ZRSN; ZR; TI;

D O I：

10.1016/j.actamat.2016.05.041

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The structural properties of (Ti,Zr,Hf)CoSb thermoelectric Half-Heusler compounds were investigated by synchrotron radiation based techniques. The short-range order, in particular the environment of the Co atoms, was studied by extended X-Ray absorption fine structure spectroscopy and the long range order by powder X-Ray diffraction. Structural models were obtained for the single phase materials TiCoSb0.85Sn0.15, ZrCoSb0.85Sn0.15, and HfCoSb0.85Sn0.15, These models were transferred for the phase-separated material Ti0.5Hf0.5CoSb0.85Sn0.15. As a result, proving that each Half-Heusler phase was well ordered, apart from the intermixing of Ti and Hf on its designated crystallographic lattice site. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：308 / 313

页数：6

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