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Issue 40, 2015

Thermal stability of Mg2Si0.3Sn0.7 under different heat treatment conditions

Author affiliations

Abstract

Sb-doped Mg2Si0.3Sn0.7 solid solutions were prepared by a two-step solid state reaction method followed by electron-discharge plasma activated sintering (Ed-PAS). Thermal stability was tested by changing heat treatment conditions, i.e., annealing temperature, annealing time, annealing atmosphere and preventive coatings. Mg loss is severe when the solid solutions are annealed in vacuum, due to the high saturated vapor pressure of Mg. As a consequence of Mg loss, the β Sn–Sb alloy formed. However, the solid solutions are oxidized when annealed in air. And this is effectively prevented when the samples are coated with boron nitride (BN) spray. The results showed that Mg2Si1−xSnx can be exposed for long periods of time to temperature up to about 823 K, provided it is protected with specific coatings. However, the structure becomes unstable when the temperature exceeds much beyond 823 K, mainly due to the peritectic reaction. The composition, microstructure and thermoelectric (TE) properties of the annealed samples were carefully explored and critically assessed.

Graphical abstract: Thermal stability of Mg2Si0.3Sn0.7 under different heat treatment conditions

Supplementary files

Article information


Submitted
20 May 2015
Accepted
23 Jun 2015
First published
23 Jun 2015

J. Mater. Chem. C, 2015,3, 10381-10387
Article type
Paper
Author version available

Thermal stability of Mg2Si0.3Sn0.7 under different heat treatment conditions

K. Yin, Q. Zhang, Y. Zheng, X. Su, X. Tang and C. Uher, J. Mater. Chem. C, 2015, 3, 10381 DOI: 10.1039/C5TC01434D

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