Issue 11, 1998
From the journal:

Journal of Materials Chemistry

Synthesis, structure, electrical and magnetic properties of the new non-stoichiometric perovskite phase, Ca2MnNbOγ

Angela Kruth,   Mitsuharu Tabuchi,   Ulrich Guth  and  Anthony R. West  

Abstract

The new phase Ca 2 MnNbO γ has an orthorhombic, GdFeO 3 structure with B site disorder of Mn and Nb. The oxygen content γ varies from 5.86 to 6.00 depending on heat treatment conditions. Treatment in high pressure O 2 required for full oxidation. Magnetic susceptibility measurements indicate mixed valence (2+, 3+) of Mn for γ=5.87 and Curie-Weiss paramagnetism at high temperatures. SQUID measurements indicate spin glass-like behaviour below 15 K. Ac impedance shows semiconducting behaviour, E=0.31(2) eV. On heating in O 2 -poor atmospheres, resistive surface layers and grain boundary effects are seen, which point to a p-type conduction mechanism.

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Article information

DOI
https://doi.org/10.1039/A804865G
Article type
Paper

J. Mater. Chem., 1998,8, 2515-2520

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Synthesis, structure, electrical and magnetic properties of the new non-stoichiometric perovskite phase, Ca2MnNbOγ

A. Kruth, M. Tabuchi, U. Guth and A. R. West, J. Mater. Chem., 1998, 8, 2515 DOI: 10.1039/A804865G

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