Name: ThermoML Representation of Published Experimental Data from Thermochimica Acta (0040-6031, Elsevier)
Creator: Thermodynamics Research Center
License: https://www.nist.gov/open/license

ABSTRACT

The heat capacity and the enthalpy increments of strontium niobate Sr2Nb2O7 and calcium niobate Ca2Nb2O7 were measured by the relaxation time method (2-300 K), DSC (260-360 K) and drop calorimetry (720-1370 K). Temperature dependencies of the molar heat capacity were derived by the least squares method from the experimental data. The molar entropies at 298.15 K were evaluated from the low temperature heat capacity measurements.

Compounds

#	Formula	Name
1	Nb2O7Sr2	niobium strontium oxide (Nb2Sr2O7)
2	Ca2Nb2O7	niobium calcium oxide (Nb2Ca2O7)

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	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	X-ray diffraction	1
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Relaxation time	124
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	74
POMD	1	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Drop calorimetry	25
POMD	2	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	X-ray diffraction	1
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Relaxation time	122
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	28
POMD	2	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Drop calorimetry	13

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Heat capacity, enthalpy and entropy of strontium niobate Sr2Nb2O7 and calcium niobate Ca2Nb2O7

Leitner, J., Hampl, M.[Milan], Ruzicka, K.[Kvetoslav], Straka, M.[Martin], Sedmidubsky, D., Svoboda, P.[Pavel]

ABSTRACT