ABSTRACT

In the present work temperature dependence of heat capacity of KTh2(PO4)3 has been measured for the first time in the range from 5.5 to 350 K by precision adiabatic vacuum calorimetry. The experimental data were used to calculate standard thermodynamic functions, namely the heat capacity CpcentsX(T), enthalpy HcentsX(T) . HcentsX(0), entropy ScentsX(T) . ScentsX(0) and Gibbs function GcentsX(T) . HcentsX(0), for the range from T _ 0 to 350 K. The value of the fractal dimension D in the function of multifractal generalization of Debye!|s theory of the heat capacity of solids was estimated and the character of heterodynamics of structure was detected. The high-temperature Xray diffraction method was used for the determination of thermal expansion coefficients.

Compounds

#	Formula	Name
1	KO12P3Th2	potassium dithorium trisphosphate

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	Vacuum adiabatic calorimetry	40
POMD	1	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	40
POMD	1	Molar entropy, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	40
POMD	1	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	X-ray diffraction	10
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	24
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	56
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	94

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Low-temperature heat capacity and thermodynamic functions of KTh2(PO4)3

Knyazev, A. V., Smirnova, N. N., Manyakina, M. E., Shushunov, A. N.

ABSTRACT