TY - JOUR
T1 - Microstructure and thermoelectric properties of higher manganese silicides fabricated via gas atomization and spark plasma sintering
AU - Liu, Lei
AU - Oda, Hiraku
AU - Onda, Tetsuhiko
AU - Yodoshi, Noriharu
AU - Wada, Takeshi
AU - Chen, Zhong Chun
N1 - Funding Information:
This work was performed under the Inter-University Cooperative Research Program (No. 17G0017) of the Cooperative Research and Development Center for Advanced Materials, Institute for Materials Research, Tohoku University. The first author also acknowledges the China Scholarship Council (No. 201706080015) for providing the financial support.
Funding Information:
This work was performed under the Inter-University Cooperative Research Program (No. 17G0017 ) of the Cooperative Research and Development Center for Advanced Materials, Institute for Materials Research, Tohoku University. The first author also acknowledges the China Scholarship Council (No. 201706080015 ) for providing the financial support.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/7/15
Y1 - 2020/7/15
N2 - Higher manganese silicides (HMS) powders were successfully prepared by a gas atomization technique. The gas atomized (GAed) powders showed spherical morphologies and a wide particle size distribution. No MnSi and Si phases were detected by XRD analyses, indicating that the high cooling rate during rapid solidification is effective in inhibiting the formation of second phases. When the GAed powders were consolidated by spark plasma sintering (SPS), the densified samples revealed almost the same phase composition as the powders and an isotropic feature. The contrast differences between different grains in backscattered electron images are believed to be associated with orientation differences. The HMS samples SPSed at different temperatures exhibited similar values of the Seebeck coefficient, but larger electrical conductivity and power factor were obtained in the sample SPSed at 1000 °C. Moreover, the HMS samples showed higher fracture toughness compared to those fabricated by a solid-state reaction and SPS process.
AB - Higher manganese silicides (HMS) powders were successfully prepared by a gas atomization technique. The gas atomized (GAed) powders showed spherical morphologies and a wide particle size distribution. No MnSi and Si phases were detected by XRD analyses, indicating that the high cooling rate during rapid solidification is effective in inhibiting the formation of second phases. When the GAed powders were consolidated by spark plasma sintering (SPS), the densified samples revealed almost the same phase composition as the powders and an isotropic feature. The contrast differences between different grains in backscattered electron images are believed to be associated with orientation differences. The HMS samples SPSed at different temperatures exhibited similar values of the Seebeck coefficient, but larger electrical conductivity and power factor were obtained in the sample SPSed at 1000 °C. Moreover, the HMS samples showed higher fracture toughness compared to those fabricated by a solid-state reaction and SPS process.
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U2 - 10.1016/j.matchemphys.2020.122990
DO - 10.1016/j.matchemphys.2020.122990
M3 - Article
AN - SCOPUS:85082859101
SN - 0254-0584
VL - 249
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
M1 - 122990
ER -