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The phase diagram of the quasi‐binary Mn3O4Al2O3 system in air has been redetermined at temperatures from 850 to 1550°C with the help of the X‐ray powder diffraction technique including high‐temperature diffractometry. Lattice constants of manganese aluminates and the powder diffraction patterns of Mn3O4, MnAl2O4 and Mn2AlO4 are presented. The influence of specimen cooling on the cubic‐to‐tetragonal transition of MnAl spinels is demonstrated. The inversion degree of the spinal compounds is discussed.
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Dekker et al. (1975) studied this question.
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