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

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journal contribution
posted on 11.02.2010, 00:00 by Vladimir I. Pet'kov, Elena A. Asabina, Alexey V. Markin, Natalia N. Smirnova
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 Cp,m0, enthalpy [Ho(T) − Ho(0)], entropy So(T), and Gibbs free energy Go(T) − Ho(0), over the range from T → 0 to 650 K, were calculated, and the fractal dimension Dfr 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.