Abstract
The solid solubility, disorder, and decomposition relationships in the system CaCO3-MgCO3 were investigated in the pressure range of from 10 to 10,000 bars and at temperatures of from 700° to 1,200° C. A sealed-tube technique was used for the most part in an internally heated pressure vessel designed for rapid operation. The top of the solvus outlining the two-phase field of magnesian calcites and dolomite is at a temperature of 1,075° C. at the composition Ca57Mg43, and above the solvus a single-phase region extends from CaCO3 to CaMg(CO3)2. The solubility gap between CaMg(CO3)2 and MgCO3 is considerably larger, and solubility of Ca++ in MgCO3 and Mg++ in CaMg(CO3)2 is quite limited at 1,100° C. Cation disorder in stoichiometric dolomite becomes observable at approximately 1,000° C. and is complete at approximately 1,200° C., at which temperature CaMg(CO3)2 has the calcite-type structure. There is no evidence for anything but a continuous (higher-order) transformation over this 200° C. interval. Disorder...
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