Work

Synthesis of Mn(AlxSi1-x)2+^|^delta; Solid Solutions Using NaAlSi and Their Thermoelectric Properties

Year: 2012

Type: article

Abstract: Polycrystalline homogeneous samples of Mn(AlxSi1-x)2+δ solid solutions were synthesized by heating the compacts of Mn, NaAlSi and Si powder mixtures with molar ratios Mn:Al:Si=0.95:y:2.05-y (y=0.80, 0.85, 0.90) at 1173 K for 12 h, followed by rinsing the samples with alcohol and water. The chemical analysis of the samples revealed that Mn(AlxSi1-x)2+δ solid solutions were formed with composition ranges of 0.37≤x≤0.40 and δ=0.04-0.08, and approximately 0.4 wt.% of Na was contaminated. The bulk sample of MnAl0.80Si1.25, which was prepared from the starting mixtures with y=0.85 and sintered at 1153-1178 K and 40 MPa for 10 min by the pulsed electric current sintering method, showed the highest thermoelectric figure of merit at 622 K (ZT=0.15).

Source: Journal of the Japan Society of Powder and Powder Metallurgy

DOI: 10.2497/jjspm.59.180

Authors: Takahiro Yamada, Suguru Asakura, Hisanori Yamane

Institutions: Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: diamond

Funder: Japan Society for the Promotion of Science

Award: Synthesis and characterization of metal silicides including volatile metals