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Electrical Properties and Cation Valencies in Mn 3 O 4
Author(s) -
DORRIS S.E.,
MASON T.O.
Publication year - 1988
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.1151-2916.1988.tb05057.x
Subject(s) - electrical resistivity and conductivity , polaron , seebeck coefficient , disproportionation , octahedron , materials science , manganese , condensed matter physics , atmospheric temperature range , electrical conduction , crystallography , thermal conduction , chemistry , electron , crystal structure , thermodynamics , metallurgy , physics , biochemistry , quantum mechanics , composite material , catalysis
The electrical conductivity and thermopower of Mn 3 O 4 were measured in the temperature range 920° to 1530°C. Electrical conduction in cubic Mn 3 O 4 is explained by the small polaron hopping of electron holes between Mn 4+ and Mn 3+ on octahedral sites. The concentrations of Mn 4+ and Mn 3+ are governed by the disproportionation equilibrium 2Mn oct 3+ ⇄Mn oct 4+ + Mn oct 2+ . This model also explains the electrical behavior of NiMn 2 O 4 and CuMn 2 O 4 .