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Studies on different LaMnO 3+δ samples have revealed that there is no correlation between the magnetic properties and large values of δ (Mn 4+ content) or the rhombohedral structure of the material. From powder x-ray diffraction studies, it was found that those LaMnO 3+δ samples showing well defined ferromagnetic transitions are of mixed-phase character: an La 1- x MnO 3+δ phase and minor amounts of an La-rich phase. The results give sufficient evidence to conclude that the self-doped, La-deficient, phases formed are responsible for ferromagnetism in LaMnO 3+δ .
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Joy et al. (2002) studied this question.
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