Enhanced power factor of higher manganese silicide via melt spin synthesis method

Shi, Xiaoya; Li, Qiang; Shi, Xun; Chen, Lidong; Li, Yulong; He, Ying

doi:10.1063/1.4905243

Enhanced power factor of higher manganese silicide via melt spin synthesis method

Journal Article · Sun Dec 28 04:00:00 EST 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4905243· OSTI ID:22399185

Shi, Xiaoya; Li, Qiang ^[1]; Shi, Xun; Chen, Lidong ^[2]; Li, Yulong; He, Ying ^[2]

Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China)

We report on the thermoelectric properties of the higher manganese silicide MnSi{sub 1.75} synthesized by means of a one-step non-equilibrium method. The ultrahigh cooling rate generated from the melt-spin technique is found to be effective in reducing second phases, which are inevitable during the traditional solid state diffusion processes. Aside from being detrimental to thermoelectric properties, second phases skew the revealing of the intrinsic properties of this class of materials, for example, the optimal level of carrier concentration. With this melt-spin sample, we are able to formulate a simple model based on a single parabolic band that can well describe the carrier concentration dependence of the Seebeck coefficient and power factor of the data reported in the literature. An optimal carrier concentration around 5 × 10{sup 20 }cm{sup −3} at 300 K is predicted according to this model. The phase-pure melt-spin sample shows the largest power factor at high temperature, resulting in the highest zT value among the three samples in this paper.

OSTI ID:: 22399185

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 24 Vol. 116; ISSN JAPIAU; ISSN 0021-8979

Country of Publication:: United States

Language:: English

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MnS Incorporation into Higher Manganese Silicide Yields a Green Thermoelectric Composite with High Performance/Price Ratio Li, Zhiliang; Dong, Jin-Feng; Sun, Fu-Hua Advanced Science, Vol. 5, Issue 9 https://doi.org/10.1002/advs.201800626	journal	July 2018
Enhanced thermoelectric power factor of Re-substituted higher manganese silicides with small islands of MnSi secondary phase Chen, Xi; Zhou, Jianshi; Goodenough, John B. Journal of Materials Chemistry C, Vol. 3, Issue 40 https://doi.org/10.1039/c5tc01536g	journal	January 2015
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHARGE CARRIERS
CONCENTRATION RATIO
COOLING
DIFFUSION
MANGANESE SILICIDES
POWER FACTOR
SEEBECK EFFECT
SOLIDS
SPIN
SYNTHESIS
TEMPERATURE DEPENDENCE
THERMOELECTRIC PROPERTIES

Enhanced power factor of higher manganese silicide via melt spin synthesis method

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References (26)

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