Electrical conductivity in oxides of manganese and related compounds

Bhide, V. G. ; Dani, R. H. (1961) Electrical conductivity in oxides of manganese and related compounds Physica, 27 (9). pp. 821-826. ISSN 0031-8914

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/003189...

Related URL: http://dx.doi.org/10.1016/0031-8914(61)90079-9


The electrical conductivity of various oxides of manganese has been discussed in the light of a super-exchange mechanism. MnO which is antiferromagnetic with 5 electrons on the 3d shell is a bad conductor because electrons cannot move down the chain of ions (Mn2+) coupled antiferromagnetically without violating Pauli's exclusion principle. On the other hand MnO2 is a good conductor with positive temperature coefficient of conductivity. Since MnO2 has 3 electrons in the 3d shell, the migration of electrons down the chain of antiferromagnetically coupled ions (Mn4+ is possible. This process has been shown to involve activation energy. The poor conductivity in Mn3O4 has been explained on the basis of its structure which may be described as Mn+2(Mn+2 Mn+4) O4.

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