ABSTRACT

In the present work potassium antimony tungsten oxide with pyrochlore structure is refined by the Rietveld method (space group Fd3m, Z=8). The temperature dependences of heat capacity have been measured first in the range from 7 to 370 K for these compound. The experimental data were used to calculate standard thermodynamic functions, namely the heat capacity o Cp (.), enthalpy ( ) (0) o o H poundsV { H , entropy So(T) - So(0) and Gibbs function ( ) (0) o o G poundsV { H , for the range from T _ 0 to 370 K. The differential scanning calorimetry was applied to measure decomposition temperature of compound under study. The high-temperature X-ray diffraction was used for the determining temperatures of phase transitions and thermal expansion coefficient.

Compounds

#	Formula	Name
1	KO5SbW	antimony potassium tungsten oxide

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	44
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal 1	Temperature, K; Crystal 1	Pressure, kPa; Crystal 1	Crystal 1	Small (less than 1 g) adiabatic calorimetry	191
POMD	1	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	44
POMD	1	Molar entropy, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	44
POMD	1	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal		Crystal Air at 1 atmosphere	X-ray diffraction	11

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Crystal structure and thermodynamic properties of potassium antimony tungsten oxide

Knyazev, A. V.[Aleksandr V.], Tananaev, I. G.[Ivan G.], Kuznetsova, N. Y.[Nataliya Yu.], Smirnova, N. N.[Nataliya N.], Letyanina, I. A.[Irene A.], Ladenkov, I. V.[Igor V.]

ABSTRACT