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Thermochemistry of Hf-Zirconolite, CaHf Ti2O7

Published online by Cambridge University Press:  10 February 2011

Robert L. Putnam ,
Alexandra Navrotsky ,
Brian F. Woodfield ,
Jennifer L. Shapiro ,
Rebecca Stevens  and
Juliana Boerio-Goates
Robert L. Putnam
Affiliation:
Thermochemistry Facility; University of CA, Davis; 4440 Chemistry Annex; Davis, CA 95616 [email protected] [email protected]
Alexandra Navrotsky
Affiliation:
Thermochemistry Facility; University of CA, Davis; 4440 Chemistry Annex; Davis, CA 95616 [email protected] [email protected]
Brian F. Woodfield
Affiliation:
Department of Chemistry and Biochemistry; Brigham Young University; C100 BNSN Provo, UT 84602; [email protected] [email protected] [email protected]
Jennifer L. Shapiro
Affiliation:
Department of Chemistry and Biochemistry; Brigham Young University; C100 BNSN Provo, UT 84602; [email protected] [email protected] [email protected]
Rebecca Stevens
Affiliation:
Department of Chemistry and Biochemistry; Brigham Young University; C100 BNSN Provo, UT 84602; [email protected] [email protected] [email protected]
Juliana Boerio-Goates
Affiliation:
Department of Chemistry and Biochemistry; Brigham Young University; C100 BNSN Provo, UT 84602; [email protected] [email protected] [email protected]
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 11
Copyright
Copyright © Materials Research Society 1999

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References

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