Thermoelectric Properties of Ca^sub 3-x^Dy^sub x^Co^sub 4^O^sub 9+[delta]^ with x = 0.00, 0.02, 0.05, and 0.10

Polycrystalline samples of Ca^sub 3-x^Dy^sub x^Co^sub 4^O^sub 9+δ^ (x = 0.00, 0.02, 0.05, and 0.10) have been prepared by conventional solid-state synthesis. The x-ray diffraction (XRD) results revealed that all the samples are single phase. The thermoelectric properties were measured at 25 K to 300...

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Bibliographic Details
Published inJournal of electronic materials Vol. 42; no. 8; p. 2582
Main Authors Bhaskar, Ankam, Jhang, C-s, Liu, Chia-jyi
Format Journal Article
LanguageEnglish
Published Warrendale Springer Nature B.V 01.08.2013
Subjects
Crystallization
Diffraction
Electric properties
Metals
Thermodynamics
X-rays
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Summary:Polycrystalline samples of Ca^sub 3-x^Dy^sub x^Co^sub 4^O^sub 9+δ^ (x = 0.00, 0.02, 0.05, and 0.10) have been prepared by conventional solid-state synthesis. The x-ray diffraction (XRD) results revealed that all the samples are single phase. The thermoelectric properties were measured at 25 K to 300 K. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The electrical resistivity of all the samples exhibited the nonmetal-to-metal transition at below 75 K. The electrical resistivity decreased and the thermopower increased with increasing Dy^sup 3+^ content. Among all the samples, Ca^sub 2.9^Dy^sub 0.10^Co^sub 4^O^sub 9+δ^ had the highest dimensionless figure of merit of 0.044 at 300 K.[PUBLICATION ABSTRACT]
ISSN:0361-5235
1543-186X
DOI:10.1007/s11664-013-2634-8