TY - JOUR
T1 - Enhanced thermoelectric properties of chimney-ladder type higher manganese silicides
AU - Miyazaki, Yuzuru
AU - Hamada, Haruki
AU - Kikuchi, Yuta
AU - Hayashi, Kei
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/8
Y1 - 2017/8
N2 - To further enhance thermoelectric (TE) properties of higher manganese silicides (HMSs), the dissipation of layered precipitates of the MnSi phase as well as the optimization of the hole carrier concentration are critical. We have systematically studied electronic structure of partially substituted solid solutions of (Mn1-xMx)Si1.7 with M = transition metals and prepared bulk samples of such solid solutions by spark plasma sintering. A 2 at% substitution of manganese with vanadium is found to dissipate the MnSi-precipitates effectively, results in a substantial increase in electrical conductivity from 3 × 104 S/m to approximately 5 × 104 S/m at 800 K. The resulting TE power factor reaches 1.86 mW/K2m at 710 K, 30% higher than that of V-free samples.
AB - To further enhance thermoelectric (TE) properties of higher manganese silicides (HMSs), the dissipation of layered precipitates of the MnSi phase as well as the optimization of the hole carrier concentration are critical. We have systematically studied electronic structure of partially substituted solid solutions of (Mn1-xMx)Si1.7 with M = transition metals and prepared bulk samples of such solid solutions by spark plasma sintering. A 2 at% substitution of manganese with vanadium is found to dissipate the MnSi-precipitates effectively, results in a substantial increase in electrical conductivity from 3 × 104 S/m to approximately 5 × 104 S/m at 800 K. The resulting TE power factor reaches 1.86 mW/K2m at 710 K, 30% higher than that of V-free samples.
KW - Chimney-ladder phase
KW - Higher manganese silicide
KW - Incommensurate composite crystal
KW - Thermoelectric properties
KW - Valence electron counts
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U2 - 10.2497/jjspm.64.461
DO - 10.2497/jjspm.64.461
M3 - Review article
AN - SCOPUS:85028926131
VL - 64
SP - 461
EP - 466
JO - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
JF - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
SN - 0532-8799
IS - 8
ER -