Heat Capacity and Standard Thermodynamic Functions of NaTi2(PO4)3 and NaHf2(PO4)3

Heat Capacity and Standard Thermodynamic Functions of NaTi2(PO4)3 and NaHf2(PO4)3

Heat capacity measurements of the crystalline phosphates NaTi2(PO4)3 and NaHf2(PO4)3 were performed between (6 and 650) K. Their thermodynamic functions, molar heat capacities C p,m 0, enthalpy [H o(T) − H o(0)], entropy S o(T), and Gibbs free energy G o(T) − H o(0), over the range from T → 0 to 650...

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Bibliographic Details
Published in:Journal of chemical and engineering data Vol. 55; no. 2; pp. 856 - 863
Main Authors: Pet'kov, Vladimir I, Asabina, Elena A, Markin, Alexey V, Smirnova, Natalia N
Format: Journal Article
Language:English
Published: American Chemical Society 11-02-2010
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Summary:Heat capacity measurements of the crystalline phosphates NaTi2(PO4)3 and NaHf2(PO4)3 were performed between (6 and 650) K. Their thermodynamic functions, molar heat capacities C p,m 0, enthalpy [H o(T) − H o(0)], entropy S o(T), and Gibbs free energy G o(T) − H o(0), over the range from T → 0 to 650 K, were calculated, and the fractal dimension D fr was evaluated. Standard entropies of formation at T = 298.15 K were estimated to be [(1174 ± 2) and (1207 ± 2)] J·K−1·mol−1 for NaTi2(PO4)3 and NaHf2(PO4)3, respectively.
ISSN:0021-9568
1520-5134
DOI:10.1021/je900494g