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investigations of the La-Mn-O system

Authors
Journal
Journal of the Less Common Metals
0022-5088
Publisher
Elsevier
Publication Date
Volume
92
Issue
1
Identifiers
DOI: 10.1016/0022-5088(83)90224-2

Abstract

Abstract Solid state equilibrium relations were studied in the region of the La-Mn-O system bounded by LaMnO 3, MnO and La 2O 3. In the temperature range 900–1380°C the defective perovskite LaMnO 3−λ coexists directly in equilibrium with lanthanum oxide and manganous oxide. Above 1380°C an intermediate phase with the formula La 2MnO 4.15 appears. This phase has a structure of the K 2NiF 4 type with cation vacancies. The number of anion vacancies in LaMnO 3−λ increases with increasing temperature; at the limiting composition the value of λ changes from 0.015 at 900°C to 0.095 at 1450°C. The behaviour of the oxygen pressure of the LaMnO 3−λ-La 2O 3-MnO equilibrium system agrees with this variation in the composition of the LaMnO 3−λ phase.

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