Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 81: Issue 3
Heat capacities and absolute entropies of UTi2O6 and CeTi2O6
Authors:
M. Donaldson Department of Chemistry and Biochemistry, Brigham Young University Provo, UT 8460, USA

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Rebecca Stevens Department of Chemistry and Biochemistry, Brigham Young University Provo, UT 8460, USA

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B. E. Lang Department of Chemistry and Biochemistry, Brigham Young University Provo, UT 8460, USA

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Juliana Boerio-Goates Department of Chemistry and Biochemistry, Brigham Young University Provo, UT 8460, USA

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B. F. Woodfielda Department of Chemistry and Biochemistry, Brigham Young University Provo, UT 8460, USA

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R. L. Putnam Thermochemistry Facility, Department of Chemical Engineering and Materials Science, University of California Davis, CA 95616, USA

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Alexandra Navrotsky Thermochemistry Facility, Department of Chemical Engineering and Materials Science, University of California Davis, Davis, CA 95616, USA

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Pages:
617–625
Online Publication Date:
08 Sep 2005
Publication Date:
01 Aug 2005
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-005-0833-0
Keywords:
enthalpy; entropy; thermodynamics; heat capacity; thermodynamic functions; brannerite; CeTi2O6; UTi2O6
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Summary As part of a larger study of the physical properties of potential ceramic hosts for nuclear wastes, we report the molar heat capacity of brannerite (UTi2O6) and its cerium analog (CeTi2O6) from 10 to 400 K using an adiabatic calorimeter. At 298.15 K the standard molar heat capacities are (179.46±0.18) J K-1 mol-1 for UTi2O6  and (172.78±0.17) J K-1 mol-1 for CeTi2O6. Entropies were calculated from smooth fits of the experimental data and were found to be (175.56±0.35) J K-1 mol-1 and (171.63±0.34) J K-1 mol-1 for UTi2O6 and CeTi2O6, respectively. Using these entropies and enthalpy of formation data reported in the literature, Gibb’s free energies of formation from the elements and constituent oxides were calculated. Standard free energies of formation from the elements are (-2814.7±5.6) kJ mol-1 for UTi2O6 and (-2786.3±5.6) kJ mol-1 for CeTi2O6. The free energy of formation from the oxides at T=298.15 K are (-5.31±0.01) kJ mol-1 and (15.88±0.03) kJ mol-1 for UTi2O6 and CeTi2O6, respectively.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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