About this Journal Submit a Manuscript Table of Contents
Journal of Nanomaterials
Volume 2013 (2013), Article ID 815925, 4 pages
http://dx.doi.org/10.1155/2013/815925
Research Article

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

1Department of Materials Science and Engineering, Korea National University of Transportation, Chungju, Chungbuk 380-702, Republic of Korea
2School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education, Cheonan, Chungnam 330-708, Republic of Korea
3Energy and Environmental Materials Division, Korea Institute of Ceramic Engineering and Technology, Seoul 153-801, Republic of Korea

Received 29 May 2013; Revised 1 August 2013; Accepted 7 August 2013

Academic Editor: Hyung-Ho Park

Copyright © 2013 Sin-Wook You et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Mg2+xSi0.7Sn0.3Sbm ( , 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.