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Grain size effect on the phase transformations of higher manganese silicide thermoelectric materials: An in situ energy dispersive x-ray diffraction study

Published online by Cambridge University Press:  13 May 2011

Aijun Zhou ,
Tiejun Zhu ,
Xinbing Zhao  and
Eckhard Mueller
Aijun Zhou
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; and State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China; and Institute of Materials Research, German Aerospace Center (DLR), 51147 Cologne, Germany
Tiejun Zhu
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Xinbing Zhao*
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Eckhard Mueller
Affiliation:
Institute of Materials Research, German Aerospace Center (DLR), 51147 Cologne, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Phase structures of microscale and nanoscale higher manganese silicides (HMSs) were investigated using in situ energy dispersive x-ray diffraction at high temperatures or/and high pressure. A few phase transformations accompanied with the presence of MnSi phase were observed in different temperature regions, which were associated with the interevolution of several incommensurate HMS phases. It was found that in nanostructured HMS, the interevolution of HMS was remarkable and accelerated compared to that in the micropowders. Meanwhile, high pressure was able to influence these phase transformations due to giant strain in the materials. The phase transformations were discussed from thermodynamic aspects with respect to the different formation enthalpy of Mn–Si system and the large surface energy and structural instability of the nanopowders.

Keywords

ThermoelectricX-ray diffractionPhase transformation
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 15: Focus Issue: Advances in Thermoelectric Materials , 14 August 2011 , pp. 1900 - 1906
Copyright
Copyright © Materials Research Society 2011

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References

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