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DOI: 10.1039/A804865G (Paper) Reference Section for: J. Mater. Chem., 1998, 8, 2515-2520

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

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

Abstract

The new phase Ca2MnNbOγ has an orthorhombic, GdFeO3 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 O2 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 O2-poor atmospheres, resistive surface layers and grain boundary effects are seen, which point to a p-type conduction mechanism.

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