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Title: Electrical conductivity and seebeck coefficient of nonstoichiometric La sub 1 minus x Sr sub x CoO sub 3 minus. delta

Abstract

This paper reports the conductivity and Seebeck coefficient of the perovskite-type oxides La{sub 1 {minus} x}Sr{sub x}CoO{sub 3 {minus} {delta}}(x = 0-0.7) measured in 10{sup {minus} 5}-1 atm O{sub 2} gas at temperatures 25{degrees}-1000{degrees}C. The results are discussed in relation to the lattice-parameter and oxygen nonstoichiometry. Close relationships were found between the temperature dependence of the conductivity and the rhombohedral angle, {alpha}. For La{sub 1 {minus} x}Sr{sub x}CoO{sub 3 {minus} {delta}} {lt} 60.3{degrees}-60.4{degrees} (LaCoO{sub 3 {minus} {delta}} above 800{degrees}C and La{sub 1 {minus} x}Sr{sub x}CoO{sub 3 {minus} {delta}} with x {gt} 0.5 at room temperature), the conductivity decreases with temperature, suggesting metallic conduction. For La{sub 1 {minus} x}Sr{sub x}CoO{sub 3 {minus} {delta}} with {alpha} {gt} 60.4{degrees}, the conductivity increases with temperature like semiconductors. In the oxides with metallic conduction, the conductivity was found to decrease with increase in the oxygen vacancy concentration. Because the conduction band is composed of the Co-O-Co network, it is considered that the band is distributed by the formation of oxygen vacancies and becomes narrower, resulting in the decrease in conductivity.

Authors:
 [1];  [2];  [3];  [4];  [5]
  1. Inst. of Environmental Science and Technology, Yokohama National Univ., Tokiwadai, Hodogaya-ku, Yokohama 240 (JP)
  2. Fundamental Research Laboratories, NEC Corporation, Miyamae-ku, Kawasaki 213 (JP)
  3. Research Inst. of Electrical Communication, Tohoku Univ., Katahira, Sendai 980 (JP)
  4. Research Inst., National Rehabilitation Center of Disabled, Namiki, Tokorozawa, Saitama 359 (JP)
  5. Dept. of Industrial Chemistry, Science Univ. of Tokyo, Yamazaki, Noda, Chiba 278 (JP)
Publication Date:
OSTI Identifier:
6837087
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society; (USA)
Additional Journal Information:
Journal Volume: 136:7; Journal Issue: 7; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 30 DIRECT ENERGY CONVERSION; PEROVSKITE; ELECTRIC CONDUCTIVITY; COBALT OXIDES; LANTHANUM OXIDES; LATTICE PARAMETERS; SEEBECK EFFECT; STRONTIUM OXIDES; TEMPERATURE DEPENDENCE; VACANCIES; ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CALCIUM OXIDES; CHALCOGENIDES; COBALT COMPOUNDS; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; ELECTRICAL PROPERTIES; LANTHANUM COMPOUNDS; MINERALS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; PEROVSKITES; PHYSICAL PROPERTIES; POINT DEFECTS; RARE EARTH COMPOUNDS; STRONTIUM COMPOUNDS; TITANIUM COMPOUNDS; TITANIUM OXIDES; TRANSITION ELEMENT COMPOUNDS; NESDPS Office of Nuclear Energy Space and Defense Power Systems; 360204* - Ceramics, Cermets, & Refractories- Physical Properties; 360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies; 300300 - Thermoelectric Generators

Citation Formats

Mizusaki, J, Tabuchi, J, Matsuura, T, Yamauchi, S, and Fucki, K. Electrical conductivity and seebeck coefficient of nonstoichiometric La sub 1 minus x Sr sub x CoO sub 3 minus. delta. United States: N. p., 1989. Web. doi:10.1149/1.2097187.
Mizusaki, J, Tabuchi, J, Matsuura, T, Yamauchi, S, & Fucki, K. Electrical conductivity and seebeck coefficient of nonstoichiometric La sub 1 minus x Sr sub x CoO sub 3 minus. delta. United States. https://doi.org/10.1149/1.2097187
Mizusaki, J, Tabuchi, J, Matsuura, T, Yamauchi, S, and Fucki, K. Sat . "Electrical conductivity and seebeck coefficient of nonstoichiometric La sub 1 minus x Sr sub x CoO sub 3 minus. delta". United States. https://doi.org/10.1149/1.2097187.
@article{osti_6837087,
title = {Electrical conductivity and seebeck coefficient of nonstoichiometric La sub 1 minus x Sr sub x CoO sub 3 minus. delta},
author = {Mizusaki, J and Tabuchi, J and Matsuura, T and Yamauchi, S and Fucki, K},
abstractNote = {This paper reports the conductivity and Seebeck coefficient of the perovskite-type oxides La{sub 1 {minus} x}Sr{sub x}CoO{sub 3 {minus} {delta}}(x = 0-0.7) measured in 10{sup {minus} 5}-1 atm O{sub 2} gas at temperatures 25{degrees}-1000{degrees}C. The results are discussed in relation to the lattice-parameter and oxygen nonstoichiometry. Close relationships were found between the temperature dependence of the conductivity and the rhombohedral angle, {alpha}. For La{sub 1 {minus} x}Sr{sub x}CoO{sub 3 {minus} {delta}} {lt} 60.3{degrees}-60.4{degrees} (LaCoO{sub 3 {minus} {delta}} above 800{degrees}C and La{sub 1 {minus} x}Sr{sub x}CoO{sub 3 {minus} {delta}} with x {gt} 0.5 at room temperature), the conductivity decreases with temperature, suggesting metallic conduction. For La{sub 1 {minus} x}Sr{sub x}CoO{sub 3 {minus} {delta}} with {alpha} {gt} 60.4{degrees}, the conductivity increases with temperature like semiconductors. In the oxides with metallic conduction, the conductivity was found to decrease with increase in the oxygen vacancy concentration. Because the conduction band is composed of the Co-O-Co network, it is considered that the band is distributed by the formation of oxygen vacancies and becomes narrower, resulting in the decrease in conductivity.},
doi = {10.1149/1.2097187},
url = {https://www.osti.gov/biblio/6837087}, journal = {Journal of the Electrochemical Society; (USA)},
issn = {0013-4651},
number = 7,
volume = 136:7,
place = {United States},
year = {1989},
month = {7}
}