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Research PapersNo Access

EFFECT OF SINTERING TEMPERATURE ON THE MICROSTRUCTURE AND THERMOELECTRIC PROPERTIES OF Ca_2.7Bi_0.3Co₄O₉

Department of Mathematical and Physical Sciences, Henan Institute of Engineering, Zhengzhou 451191, China

School of Physical Engineering and Material Physics Laboratory, Zhengzhou University, Zhengzhou 450052, China

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Department of Physics and Electronic Engineering, Zhoukou Normal University, Zhoukou 466001, China

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Department of Mathematical and Physical Sciences, Henan Institute of Engineering, Zhengzhou 451191, China

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School of Physical Engineering and Material Physics Laboratory, Zhengzhou University, Zhengzhou 450052, China

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https://doi.org/10.1142/S0217979209052777Cited by:3 (Source: Crossref)

Abstract

Ca_2.7Bi_0.3Co₄O₉ samples have been sintered in temperature range of 1183–1243 K by conventional solid-state reaction method. XRD and SEM investigations show that c-axis-oriented structure could be formed in these samples and Lotgering factors increase with the increase of sintering temperature when it is below 1223 K, from 52% for the sample sintered at 1183 K to 86% for the sample sintered at 1223 K. Due to decomposition of Ca_2.7Bi_0.3Co₄O₉, however, the c-axis-oriented structure was destroyed in the sample sintered at 1243 K although Ca_2.7Bi_0.3Co₄ O₉ phase could be recovered at the cooling stage. The size of grains in all samples increases with the increase of sintering temperature, but the relative densities are almost kept unchanged for the samples sintered at the temperature higher than 1183 K. Due to the highly textured structure, the transport properties of the sample sintered at 1223 K are anisotropic and its ZT values in the ab plane are obviously larger than those along the c-axis.

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Vol. 23, No. 18

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Received 3 December 2007

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