Half-Heusler phase formation and Ni atom distribution in M-Ni-Sn (M = Hf, Ti, Zr) systems

被引：18
|
作者：
Guzik, Matylda N. [1 ,2 ]
Echevarria-Bonet, Cristina [1 ]
Riktor, Marit D. [3 ]
Carvalho, Patricia A. [3 ]
Gunnaes, Anette E. [2 ]
Sorby, Magnus H. [1 ]
Hauback, Bjorn C. [1 ]
机构：
[1] Inst Energy Technol, Phys Dept, POB 40, N-2027 Kjeller, Norway
[2] Univ Oslo, Dept Phys, POB 1048, N-0316 Oslo, Norway
[3] SINTEF Mat & Chem, POB 124, N-0316 Oslo, Norway
来源：
ACTA MATERIALIA | 2018年 / 148卷
关键词：
Thermoelectric materials; Half-Heusler compounds; Powder X-ray diffraction; Phase separation; Solid solution; THERMOELECTRIC-MATERIALS; ALLOYS; PERFORMANCE; CRYSTALS; GAP;
D O I：
10.1016/j.actamat.2018.01.019
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
High resolution synchrotron radiation powder X-ray diffraction (SR-PXD) and scanning transmission electron microscopy (STEM) have been employed for structural characterization of MNiSn, M0.5M'0.5NiSn and M0.5M'M-0.25"0.25NiSn (M, M', M" = Hf, Ti, Zr) half-Heusler compounds, synthesized by arc melting and thermal annealing. Rietveld refinement results demonstrate that ternary Ti- and Hf-based compositions crystallize with only one half-Heulser phase, while two cubic phases are found in samples with nominal composition ZrNiSn. The performed analysis does not suggest obvious presence of excess Ni in any of the ternary compounds. Instead, it shows disordered distribution of the stoichiometric Ni atoms over 4c and the nominally vacant 4d sites in ZrNiSn as well as formation of Ni vacancies at the 4c site in ZrNi0.98Sn. (c) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：216 / 224
页数：9
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