ABSTRACT

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.

Compounds

#	Formula	Name
1	NaO12P3Ti2	sodium dititania triphosphate
2	Hf2NaO12P3	sodium dihafnium triphosphate

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	187
POMD	1	Molar entropy, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	59
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	41
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	136
POMD	1	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	41
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	178
POMD	2	Molar entropy, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	41
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	41
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	119
POMD	2	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	41

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

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

Petkov, V.[Vladimir], Asabina, E.[Elena], Markin, A.[Alexey], Smirnova, N.[Natalia]

ABSTRACT