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The silicon-free end member of the hydrogrossular solid solution series, katoite Ca 3 Al 2 [(OH) 4 ] 3 , was synthesized in a solid-media, piston-cylinder apparatus. The enthalpy of formation from the component oxides was measured by high-temperature oxide melt calorimetry and found to be ΔHf = 2255.6 ± 12.2 kJ/mol; the resulting enthalpy of formation from the elements is ΔHf = 25551.5 ± 16.4 kJ/mol. From this value, enthalpies for breakdown reactions of hydrogrossular were calculated and the relative energetic stability of katoite evaluated.

Enthalpy of formation of katoite Ca 3 Al 2 [(OH) 4 ] 3 : Energetics of the hydrogarnet substitution