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Structural Characterization of YMexMn1−xO3 (Me=Cu, Ni, Co) Perovskites

✍ Scribed by Carlos Moure; Dionisio Gutierrez; Octavio Peña; Pedro Duran

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
435 KB
Volume
163
Category
Article
ISSN
0022-4596

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✦ Synopsis

The structural properties of the YMe x Mn 1؊x O 3 (Me ‫؍‬ Cu, Ni, Co) pseudobinary oxides have been studied by X-ray di4raction and electrical measurements. The powders were prepared by solid state reaction between the corresponding oxides. The incorporation in solid solution of small divalent cations, Cu 2؉ , Ni 2؉ , and Co 2؉ , substituting for Mn in the hexagonal YMnO 3 compound, leads to a phase transition in which a perovskite-type structure is formed. The amount of substituting cation necessary for such a transition depends on the cation nature and, to a small extent, on the ionic radius. The phase transition depends strongly on the progressive substitution of the Jahn+Teller Mn 3؉ cation and therefore of the cooperative Jahn+Teller interaction weakness. The steric in6uence plays a secondary role, as is shown by the very small variation of the tolerance factor, t, as a function of the cation content. The solid solutions with perovskite-type structure show semiconducting behavior. The conductivity mechanism is of a thermally activated small polaron hopping.

2002 Elsevier Science (USA)

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