Year: 2004
Type: article
Abstract: Highly textured Ca-doped (ZnO) m In 2 O 3 ( m is an integer) ceramics were fabricated by the reactive templated grain growth (RTGG) method and their thermoelectric properties were examined. Platelike ZnSO 4 ·3Zn(OH) 2 particles were used as reactive templates and mixed with In 2 O 3 and CaCO 3 powders into a stack of tapes. In situ formation and subsequent sintering resulted in textured Ca-doped (ZnO) m In 2 O 3 ceramics. The electrical conductivity of the textured specimen along the a b -plane was almost two times larger than that of the textured specimen along the c -axis and about 30% larger than that of a nontextured specimen. On the other hand, the Seebeck coefficients of the textured specimen exhibited a small anisotropy. The thermal conductivity of the RTGG specimen along the a b -plane was higher than that of the RTGG specimen along the c -axis. However, both specimens showed similar values at high temperatures. As a result, the Ca-doped specimen along the a b -plane with a composite phase of (ZnO) 3 In 2 O 3 and (ZnO) 4 In 2 O 3 showed a Z T value of 0.31 (at 1053 K), compared with 0.23 (at 1053 K) for the nontextured specimen.
DOI: 10.1143/jjap.43.7133
Authors: Hisashi Kaga, Ryoji Asahi, Toshihiko Tani
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1662653752