Crystal structure and thermoelectric properties of β-MoSi2

Takahiro Yamada; Hisanori Yamane

doi:10.1016/j.intermet.2011.02.003

Crystal structure and thermoelectric properties of β-MoSi₂

Takahiro Yamada, Hisanori Yamane

IMRAM - Division of Inorganic Material Research

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

A powder sample of a metastable phase β-MoSi₂ having the C40-type crystal structure was prepared by heating Mo sheets with a Na-Si melt at 858 K for 12 h to determine details of the crystal structure. The lattice constants (a = 4.6016(3) and c = 6.5700(3) ) and Si atom coordinate (y = 0.1658(2)) of β-MoSi₂ were determined by Rietveld analysis of the X-ray powder diffraction. The thermoelectric properties were refined for a bulk sample prepared by sintering the β-MoSi₂ powder at 773 K and 600 MPa. The electrical resistivity of the sintered β-MoSi₂ sample with a relative density of 65% of the theoretical one was 2.5 mΩ cm at 300 K, and slightly increased with increasing temperature from 300 to 725 K. The Seebeck coefficients changed from +60 to +89 μV/K in the temperature range from 330 to 725 K. The maximum thermoelectric power factor was 2.2 × 10^-6 W cm^-1 K^-2 at 725 K.

Original language	English
Pages (from-to)	908-912
Number of pages	5
Journal	Intermetallics
Volume	19
Issue number	7
DOIs	https://doi.org/10.1016/j.intermet.2011.02.003
Publication status	Published - 2011 Jul

Keywords

A. Molybdenum silicides
B. Crystallography
B. Thermoelectric properties
C. Melting

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10.1016/j.intermet.2011.02.003

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title = "Crystal structure and thermoelectric properties of β-MoSi2",

abstract = "A powder sample of a metastable phase β-MoSi2 having the C40-type crystal structure was prepared by heating Mo sheets with a Na-Si melt at 858 K for 12 h to determine details of the crystal structure. The lattice constants (a = 4.6016(3) and c = 6.5700(3) ) and Si atom coordinate (y = 0.1658(2)) of β-MoSi2 were determined by Rietveld analysis of the X-ray powder diffraction. The thermoelectric properties were refined for a bulk sample prepared by sintering the β-MoSi2 powder at 773 K and 600 MPa. The electrical resistivity of the sintered β-MoSi2 sample with a relative density of 65% of the theoretical one was 2.5 mΩ cm at 300 K, and slightly increased with increasing temperature from 300 to 725 K. The Seebeck coefficients changed from +60 to +89 μV/K in the temperature range from 330 to 725 K. The maximum thermoelectric power factor was 2.2 × 10-6 W cm-1 K-2 at 725 K.",

keywords = "A. Molybdenum silicides, B. Crystallography, B. Thermoelectric properties, C. Melting",

author = "Takahiro Yamada and Hisanori Yamane",

note = "Funding Information: This work was performed under the Inter-university Cooperative Research Program of the Institute for Materials Research, Tohoku University and was supported in part by a Grant-in-Aid for Young Scientists (A) ( 20685015 ) from the Ministry of Education, Culture, Sports, Science and Technology, Japan . We would like to thank Mr. Akira Okubo, Dr. Tetsuya Ashino, and Mr. Fuyuki Sakamoto, who all belong to Tohoku University, for sintering of the samples with the pulse-current pressure sintering equipment (Mr. Okubo) and for chemical quantitative analysis of elements in the samples (Dr. Ashino and Mr. Sakamoto).",

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N1 - Funding Information: This work was performed under the Inter-university Cooperative Research Program of the Institute for Materials Research, Tohoku University and was supported in part by a Grant-in-Aid for Young Scientists (A) ( 20685015 ) from the Ministry of Education, Culture, Sports, Science and Technology, Japan . We would like to thank Mr. Akira Okubo, Dr. Tetsuya Ashino, and Mr. Fuyuki Sakamoto, who all belong to Tohoku University, for sintering of the samples with the pulse-current pressure sintering equipment (Mr. Okubo) and for chemical quantitative analysis of elements in the samples (Dr. Ashino and Mr. Sakamoto).

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N2 - A powder sample of a metastable phase β-MoSi2 having the C40-type crystal structure was prepared by heating Mo sheets with a Na-Si melt at 858 K for 12 h to determine details of the crystal structure. The lattice constants (a = 4.6016(3) and c = 6.5700(3) ) and Si atom coordinate (y = 0.1658(2)) of β-MoSi2 were determined by Rietveld analysis of the X-ray powder diffraction. The thermoelectric properties were refined for a bulk sample prepared by sintering the β-MoSi2 powder at 773 K and 600 MPa. The electrical resistivity of the sintered β-MoSi2 sample with a relative density of 65% of the theoretical one was 2.5 mΩ cm at 300 K, and slightly increased with increasing temperature from 300 to 725 K. The Seebeck coefficients changed from +60 to +89 μV/K in the temperature range from 330 to 725 K. The maximum thermoelectric power factor was 2.2 × 10-6 W cm-1 K-2 at 725 K.

AB - A powder sample of a metastable phase β-MoSi2 having the C40-type crystal structure was prepared by heating Mo sheets with a Na-Si melt at 858 K for 12 h to determine details of the crystal structure. The lattice constants (a = 4.6016(3) and c = 6.5700(3) ) and Si atom coordinate (y = 0.1658(2)) of β-MoSi2 were determined by Rietveld analysis of the X-ray powder diffraction. The thermoelectric properties were refined for a bulk sample prepared by sintering the β-MoSi2 powder at 773 K and 600 MPa. The electrical resistivity of the sintered β-MoSi2 sample with a relative density of 65% of the theoretical one was 2.5 mΩ cm at 300 K, and slightly increased with increasing temperature from 300 to 725 K. The Seebeck coefficients changed from +60 to +89 μV/K in the temperature range from 330 to 725 K. The maximum thermoelectric power factor was 2.2 × 10-6 W cm-1 K-2 at 725 K.

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KW - C. Melting

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Crystal structure and thermoelectric properties of β-MoSi₂

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