Thermoelectric properties of single crystalline Ba8Al xSi46-x clathrate by using flux Czochralski method

Yuya Nagatomo, Naoki Mugita, Yusuke Nakakohara, Makoto Saisho, Mikihito Tajiri, Ryo Teranishi, Shinji Munetoh

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Abstract

Single crystalline Ba8AlxSi46-x clathrates for use as thermoelectric materials were synthesized by the flux Czochralski method. Their aluminum content increased with that of the solution. The Seebeck coeffcients and electric specifc resistances of the Ba8Al xSi46-x clathrates increased with aluminum content, whereas the carrier concentration decreased. The chemical compositions of the single crystalline samples from solutions of Ba8Al 30Si30, Ba8Al40Si30 and Ba8Al50Si30 were Ba7.8Al 14.1Si31.9, and Ba7.8Al14.6Si 31.4, and Ba7.8Al14.9SiSi31.1, respectively. The power factors of the single crystalline Ba 7.8Al14.1Si31.9, Ba7.8Al 14.6Si31.4 and Ba7.8Al14.9SiSi 31.1 at 773 K were 6.86×10-4 7.75×10 -4 and 8.89×10-4 V2/K2Ω m. The results indicate that the carrier concentration of the Ba 8AlxSi46-x clathrates can be controlled by the composition of the solution, and that the flux Czochralski method is effective for synthesizing high performance thermoelectric materials.

Original languageEnglish
Article number012008
JournalJournal of Physics: Conference Series
Volume379
Issue number1
DOIs
Publication statusPublished - Jan 1 2012
EventInternational Symposium on Materials Science and Innovation for Sustainable Society: Eco-Materials and Eco-Innovation for Global Sustainability, ECO-MATES 2011 - Osaka, Japan
Duration: Nov 28 2011Nov 30 2011

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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