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Author Oide, Y. ♦ Miyazaki, Y. ♦ Ono, Y. ♦ Huang, X.Y. ♦ Kajitani, T.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2006
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Electricity & electronics ♦ Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Thermoelectricity ♦ Niobium ♦ Zirconium ♦ Cobalt ♦ Heating ♦ Electric resistance ♦ Temperature dependence ♦ Powders ♦ X-ray scattering ♦ Physics
Abstract Systematic ion substitution has been performed on the Co site in the rock-salt (RS)-type $[Ca_{2}CoO_{3}]$ subsystem of misfit-layered cobalt oxide $[Ca_{2}(Co_{1-x}A_{x})O_{3-delta}]$ $_{0.62}CoO_{2}$ (A = Nb, Ru, Ta, Pb, W, La and Zr). The oxygen deficiency delta and the decomposition temperature $T_{d}$ of the substituted samples have been determined by means of the thermogravimetric analysis (TGA). Upon heating, the oxygen atoms are gradually released from the RS-type subsystem up to delta~0.10. A small amount (x = 0.10) of the substitution remarkably increases Tdfrom 1173 K (x = 0) up to 1246 K (A = Nb). The Pb-substituted samples show substantial decrease in electrical resistivity p from 19.2 mOmegacm to 13.8 mOmegacm (x = 0.10) at 950 K. The highest thermoelectric power, $S^{2}p^{-1}$ = 2.1times10-4$WK^{-2}$ $m^{-1}$ , is realized for the Pb-substituted sample with x = 0.10 at 950 K
Description Author affiliation: Dept. of Appl. Phys., Tohoku Univ., Sendai (Oide, Y.; Miyazaki, Y.; Ono, Y.)
ISBN 1424408105
ISSN 10942734
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2006-08-06
Publisher Place Austria
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Size (in Bytes) 4.17 MB
Page Count 4
Starting Page 402
Ending Page 405


Source: IEEE Xplore Digital Library