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Electrical Conduction in Co 1‐χ Mg χ O
Author(s) -
KOUMOTO KUNIHITO,
YAMAYOSHI KEIKO,
YANAGIDA HIROAKI
Publication year - 1983
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1983.tb09965.x
Subject(s) - seebeck coefficient , electrical resistivity and conductivity , materials science , activation energy , vacancy defect , thermal conduction , cobalt , thermoelectric effect , analytical chemistry (journal) , conductivity , electron mobility , electrical conduction , condensed matter physics , chemistry , thermal conductivity , crystallography , thermodynamics , metallurgy , optoelectronics , electrical engineering , physics , chromatography , engineering , composite material
Electrical conductivity and thermoelectric power were measured on Co 1‐χ Mg χ O (0.16χ 0.87) at 900° to 1200°C. Electrical conductivity σ decreased and the activation energy increased with increasing MgO content. Seebeck coefficient α appeared to be positive for all χ. The difference in temperature dependence of σ and α was 0.2 to 0.5 eV and the hole mobility decreased with increasing MgO content. The results were interpreted as showing that electron holes were localized to cation clusters and their thermally activated hopping conduction was operative in the solid solution. The dominant lattice defect changed from singly to doubly ionized cobalt vacancy with increasing MgO content.