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Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/14256

Title: Improvement on the High Temperature Thermoelectric Performance of Ga-doped Misfit-layered Ca3Co4-xGaxO9+δ (x = 0, 0.05, 0.1, and 0.2)
Authors: Nong, N. V.;Liu, Chia-Jyi;Ohtak, M.
Contributors: 物理學系
Keywords: Thermoelectricity;Misfit cobalt oxides;Figure of merit;Hot press
Date: 2010-02
Issue Date: 2012-09-10T06:16:08Z
Publisher: Elsevier
Abstract: Highly densified Ca3Co4−xGaxO9+δ (0 ≤ x ≤ 0.2) misfit-layered thermoelectric oxides are prepared by solid state reaction methods followed by hot-pressing. Thermoelectric properties of the samples are measured from room temperature to 1200 K. The results show that partial Ga substitution leads to a simultaneous increase of the electrical conductivity and thermopower. The Ga-doped samples have lower thermal conductivity than that of the non-doped sample in the high temperature region (>600 K). The x = 0.05 sample shows a higher figure of merit (Z = 3.37 × 10−4 K−1) than that of the non-doped sample (Z = 1.98 × 10−4 K−1) at 1073 K, indicating significant improvement of the thermoelectric performance of Ca3Co4O9+δ by partial Ga substitution for Co.
Relation: Journal of Alloys and Compounds, 491(1-2): 53-56
Appears in Collections:[物理學系] 期刊論文

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