1995 年 17 巻 8 号 p. 372-377
Cation and cation vacancy distribution equilibria in the cubic phase of jacobsite-hausmannite solid solution system have been calculated by a defect-chemical approach as a function of some equilibrium constants, partial pressure of oxygen Po2 and compositional ratio x in MnxFe3−xO4 (x=1 to 3). The concentration of metal vacancy was zero and a considerable amount of Fe2+ in the octahedral site, which was equal to Fe3+ in the tetrahedral site, appeared in case of appropriate values of equilibrium constants and small values of Po2. The distribution results in a fairly good agreement with the reported Mössbauer spectroscopic data. In spite of constant metal ratio, the concentraion of Fe2+ is lessened with increasing Po2 and metal vacancy in the tetrahedral site appeared considerably. These results suggest that the estimation of temperature and Po2 for formation of natural specimen is possible from the observed values of cation distribution, if some thermodynamic values are known.