Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3425891
Keywords
bismuth compounds; calcium compounds; ceramics; cobalt compounds; electrical conductivity; thermoelectricity
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Funding
- Ministry of Science and Technology of China [2007CB607504]
- National High Technology Research and Development Program of China [2009AA03Z216]
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Textured Bi-substituted Ca2Co2O5 ceramics have been prepared using a coprecipitation method combined with spark plasma sintering. The Bi substitution is effective in increasing the grain orientation of the Ca2Co2O5-based ceramics (from 0.46 to 0.85). Electrical conductivity increases obviously with partial substitution of Bi3+ for Ca2+ (from 113.9 to 142.4 S/cm at 973 K). The Ca1.92Bi0.08Co2O5 sample exhibits higher power factor (4.4 x 10(-4) W m(-1) K-2) than that of pure Ca2Co2O5 (3.2 x 10(-4) W m(-1) K-2) at 973 K, indicating that the Ca2Co2O5 system is another promising p-type material for high-temperature thermoelectric applications. (C) 2010 American Institute of Physics. [doi:10.1063/1.3425891]
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