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Thermochemistry of Hf-Zirconolite, CaHf Ti2O7

  • Robert L. Putnam (a1), Alexandra Navrotsky (a1), Brian F. Woodfield (a2), Jennifer L. Shapiro (a2), Rebecca Stevens (a2) and Juliana Boerio-Goates (a2)...

Abstract

The formation enthalpy, - 3752.3 ± 4.7 kJ·mol−1, of Hf-zirconolite, CaHfTi2O7, was obtained using high temperature oxide-melt solution calorimetry. Combined with heat capacity data obtained using low temperature adiabatic calorimetry we report the heat capacity (Cp) and the standard molar formation energetics (ΔH°f. elements, Δ S°T, and ΔG°f. elements)for Hf-zirconolite from T = 298.15 K to T = 1500 K. Comparison of Hf-zirconolite with Zr-zirconolite is made.

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