Work

Solid‐State Synthesis and Thermoelectric Properties of Mg2+xSi0.7Sn0.3Sbm

Year: 2013

Type: article

Abstract: Mg2+xSi0.7Sn0.3Sbm (0 ≤ x ≤ 0.2, m = 0 or 0.01) solid solutions have been successfully prepared by mechanical alloying and hot pressing as a solid‐state synthesis route. All specimens were identified as phases with antifluorite structure and showed n‐type conduction. The electrical conductivity of Mg‐excess solid solutions was enhanced due to increased electron concentrations. The absolute values of the Seebeck coefficient varied substantially with Sb doping and excess Mg, which was attributed to the change in carrier concentration. The onset temperature of bipolar conduction was shifted higher with Sb doping and excess Mg. The lowest thermal conductivity of 1.3 W/mK was obtained for Mg2Si0.7Sn0.3Sb0.01. A maximum ZT of 0.64 was achieved at 723 K for Mg2.2Si0.7Sn0.3Sb0.01.

Source: Journal of Nanomaterials

DOI: 10.1155/2013/815925

Authors: Sin-Wook You, Il-Ho Kim, Soon-Mok Choi, Won-Seon Seo

Institutions: Korea National University of Transportation, Korea University of Technology and Education, Korea Institute of Ceramic Engineering and Technology

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,375

Funder: Ministry of Trade, Industry and Energy