Abstract
The tetragonal-to-cubic transformation of hausmannite, Mn 3O 4, was studied by high-temperature X-ray analysis. The transformation exhibits properties characteristic of diffusionless processes, i.e., coexistence of regions of tetragonal and cubic phases, and hysteresis. The position of the coexistence region with regard to temperature depends on the oxygen stoichiometry and/or concentration of Mn 3+ ions.
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