ABSTRACT

The enthalpy increment measurements were performed using drop calorimetry on two lanthanide zirconates Ln2Zr2O7, Ln = La, Nd, with pyrochlore structure. The temperature dependence of heat capacity in the range (298 to 1550) K was derived by simultaneous linear regression of the measured enthalpies combined with the heat capacity data around ambient temperature. The obtained heat capacity C?poT P is compared to the limit of constant volume lattice Cv calculated from the analysis of low temperature specific heat data using a combined Debye Einstein harmonic approximation model.

Compounds

#	Formula	Name
1	Nd2O3	neodymium(III) oxide
2	La2O3	lanthanum oxide
3	La2O7Zr2	lanthanum zirconium oxide
4	Nd2O7Zr2	dineodymium(III) dizirconium(IV) 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 enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	1	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Drop calorimetry	2
POMD	1	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	1	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	1	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	2	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	2	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	2	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	2	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	2	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	2	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	2	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	3	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Drop calorimetry	2
POMD	3	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	3	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	3	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	3	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	3	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	3	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	4	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	4	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	4	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	4	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	4	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	4	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	4	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	4	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	4	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	4	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1
POMD	4	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	Drop calorimetry	1

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

High temperature heat capacity of Nd2Zr2O7 and La2Zr2O7 pyrochlores

Sedmidubsky, D., Benes, O., Konings, R. J. M.

ABSTRACT