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Edward B. Magrab
Edward B. Magrab
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Februar 2010
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New oxygen-deficient perovskite series, Ca2Mn2-xNbxOγ: 0&x&1.2
An extensive range of orthorhombic perovskites with the GdFeO
structure, variable B-cation content and variable oxygen content form according to the formula Ca
: 0&x&1.2. A second, closely-related, oxygen-deficient solid solution with a simple cubic perovskite structure forms over the range 0.3&x&0.8. Oxygen contents range from 5.0&γ&6.0 for x=0 to 5.8 &γ&6.0 for x=1.2 and are obtained by post-reaction heat treatment, either in air at different temperatures or in H
. The orthorhombic solid solutions are either oxygen-stoichiometric or lightly reduced and transform to the cubic structure on more extensive reduction. A phase diagram is presented showing the equilibrium γ values in air over the temperature range
°C. The variable composition of the solid solutions is accommodated by vacancies in up to 20% of the oxygen positions and variations in the oxidation state of Mn, between +2 and +4.
Article type:
J. Mater. Chem., 1999,9,
ReferenceManager
A. Kruth, U. Guth and A. R. West,
J. Mater. Chem., 1999,&9, 1579
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