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American Mineralogist; March 1999; v. 84; no. 3; p. 389-391
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Enthalpy of formation of katoite Ca 2 Al 2 [(OH) 4 ] 3 ; energetics of the hydrogarnet substitution

Mirko Schoenitz, and Alexandra Navrotsky

University of California, Department of Chemical Engineering and Materials Science, Davis, CA, United States

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 Delta H f = -255.6+ or -12.2 kJ/mol; the resulting enthalpy of formation from the elements is Delta H f = -5551.5+ or -16.4 kJ/mol. From this value, enthalpies for breakdown reactions of hydrogrossular were calculated and the relative energetic stability of katoite evaluated.

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