Fundamental thermodynamics of actinide-bearing mineral waste forms.

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This report summarizes work after completion of a three-year project and our current ongoing efforts. Research efforts at UC Davis have focused on establishing the thermodynamic properties of zirconolite and pyrochlore, and the synthesis of other minerals relevant to storage of nuclear material. Heat capacity, entropy, enthalpy of formation, and fkee energy of formation data were established for zirconolite, CaZrTi{sub 2}O{sub 7}, in the range from 0 to 1500 K. The heat capacity, entropy, enthalpy of formation, and free energy of formation at 298 K for zirconolite are 211.9 J/K mol, 193.3 J/K mol, -3713.8 kJ/mol, and -35 14.6 kJ/mol, ... continued below

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2 p.

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Gallegos, U. F. (Ubaldo F.) & Putnam, R. L. (Robert L.) January 1, 2002.

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Description

This report summarizes work after completion of a three-year project and our current ongoing efforts. Research efforts at UC Davis have focused on establishing the thermodynamic properties of zirconolite and pyrochlore, and the synthesis of other minerals relevant to storage of nuclear material. Heat capacity, entropy, enthalpy of formation, and fkee energy of formation data were established for zirconolite, CaZrTi{sub 2}O{sub 7}, in the range from 0 to 1500 K. The heat capacity, entropy, enthalpy of formation, and free energy of formation at 298 K for zirconolite are 211.9 J/K mol, 193.3 J/K mol, -3713.8 kJ/mol, and -35 14.6 kJ/mol, respectively. Solution calorimetry experiments with cerium pyrochlore, Ca{sub 0.8}Ce{sub 1.2}Ti{sub 2}O{sub 7}, are complete. Heat capacity data and confirmation of the pyrochlore composition are required for final data analysis. Synthesis and characterization of CaHfTi{sub 2}O{sub 7}, CaZr{sub 0.5}Hf{sub 0.5}Ti{sub 2}O{sub 7}, Gd{sub 2}Ti{sub 2}O{sub 7}, and CeTi{sub 2}O{sub 6} is complete. Research efforts at Los Alamos have focused on establishing synthesis techniques for actinide-bearing minerals and preparation of the calorimetry laboratory. The preparation of Pu-pyrochlore, nominally CaPuTi{sub 2}O{sub 7} has been achieved by Ebbinghaus at Lawrence Livermore National Laboratory. A sample of this material has been sent to Putnam at Los Alamos National Laboratory.

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2 p.

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  • Submitted to: 9th Biennial International Conference on Nuclear and Hazardous Waste Management, August 4-8, 2002, Reno, NV

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  • Report No.: LA-UR-02-0562
  • Report No.: LA-UR-02-562
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 976063
  • Archival Resource Key: ark:/67531/metadc931425

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  • January 1, 2002

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 9, 2016, 11:32 p.m.

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Gallegos, U. F. (Ubaldo F.) & Putnam, R. L. (Robert L.). Fundamental thermodynamics of actinide-bearing mineral waste forms., article, January 1, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc931425/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.