Effects of KCl Addition on the K2CO3 Flux Growth of Ca3Co4O9 Crystals for a Thermoelectric Device

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Published 1 June 2003 • Copyright (c) 2003 The Japan Society of Applied Physics
, , Citation Masashi Mikami et al 2003 Jpn. J. Appl. Phys. 42 3549 DOI 10.1143/JJAP.42.3549

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1 Department of Electrical Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan

2 National Institute of Advanced Industrial Science and Technology, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan

Dates

  1. Received 20 November 2002
  2. Accepted 29 January 2003
  3. Published

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Abstract

Crystals of Ca3Co4O9 were grown by a solution method. We found that an appropriate amount of KCl addition to the K2CO3 flux can facilitate the growth of Ca3Co4O9 crystals and suppress the crystallization of Ca3Co2O6, which is the decomposed phase of Ca3Co4O9. Using a flux composition of K2CO3:KCl=4:1, we obtained large single Ca3Co4O9 crystals possessing a well-grown ab-plane. The largest crystal formed had a size of about 4.5×2.5×0.02 mm3. The in-plane electrical resistivity and Seebeck coefficient at 300 K are 12 mΩcm and 150 µV/K, respectively. The Seebeck coefficient exhibited is slightly larger than previously reported values.

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10.1143/JJAP.42.3549