Year: 2017
Type: article
Abstract: 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.
DOI: 10.2497/jjspm.64.461
Authors: Yuzuru MIYAZAKI, Haruki HAMADA, Yuta KIKUCHI, Kei HAYASHI
Institution: Tohoku University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2752782716