Theory of Homologous Sublattices and Intracrystalline Equilibria

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Science  17 Aug 1962:
Vol. 137, Issue 3529, pp. 540-541
DOI: 10.1126/science.137.3529.540


A method is presented by which the isothermal-isobaric distribution of certain atomic or ionic species among two sublattices of a crystal may be calculated from the heterogeneous exchange equilibria of the species between two coexisting crystalline phases, one of which is the crystal under investigation. The method depends on structural homologies between the crystals. Quantitative data on the distribution of Mg2+ and Fe2+ in the mineral cummingtonite are found to agree with the theory.