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Gels with nominal molar compositions of CaO⋅MgO⋅2SiO2 and CaO⋅MgO⋅1.95SiO2 using a mixture of each individual metal alkoxide were prepared without adding hydrochloric acid as a catalyst. The crystallization of CaMgSi2O6 (diopside) by heating the gels at various temperatures was investigated. Elemental analysis by EPMA showed the microscopic compositional nonuniformity of the metals in the gels. It was found from DTA-TG, XRD and FTIR analyses that calcium silicates firstly crystallized from a gel-like glass upon heating at temperatures below 1073K, beyond which CaMgSi2O6 formed as a predominant crystalline phase. This crystallization process was different from that observed for calcined powders of carbonate and oxides prepared by the conventional solid-state reaction method.

Effect of Hydrochloric Acid Catalyst on the Crystallization of Sol-Gel-Derived CaMgSi2O6 Gels.