ABSTRACT

The compounds, Cr2TeO6(s), Fe2TeO6(s) and Ni3TeO6(s) were synthesized by solid-state route andcharacterized using X-ray diffraction technique. Thermal expansion of Fe2TeO6(s) and Ni3TeO6(s)were studied by high temperature X-ray diffraction technique in the temperature range 298 973 K and298 923 K, respectively. The average volume thermal expansion coefficient of Fe2TeO6(s) and Ni3TeO6(s) were determined to be 2.46 * 10-5and 3.02 * 10-5K-1, respectively. Heat capacity of Cr2TeO6(s),Fe2TeO6(s) and Ni3TeO6(s) was measured, in the temperature range of 300 870 K, employing temper-ature modulated differential scanning calorimeter. The Gibbs energy of formation of Fe2TeO6(s) andNi3TeO6(s) were measured using transpiration method. An empirical function was derived to computeenthalpy of formation of AnTeO6(s) (where A = various elements of periodic table, n = 2, 3 or 6). Self consis-tent thermodynamic functions of Cr2TeO6(s), Fe2TeO6(s) and Ni3TeO6(s) were calculated. The chemicalpotential diagrams of A Te O (A = Cr, Fe, Te) system were also constructed.

Compounds

#	Formula	Name
1	Fe2O3	ferric oxide
2	O2Te	tellurium dioxide
3	O2	oxygen
4	NiO	nickel(II) oxide
5	Cr2O6Te	chromium(III) tellurate(VI) (Cr2TeO6)
6	Fe2O6Te	iron(III) tellurate(VI) (Fe2TeO6)
7	Ni3O6Te	nickel(II) tellurate(VI) (Ni3TeO6)

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	5	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	13
POMD	6	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	X-ray diffraction	8
POMD	6	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	13
POMD	7	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	X-ray diffraction	8
POMD	7	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	13
RXND	1 2 6 3	Molar Gibbs energy of reaction, kJ/mol				transpiration	12
RXND	4 2 7 3	Molar Gibbs energy of reaction, kJ/mol				transpiration	11

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Thermo physico-chemical investigations on A-Te-O (A = Cr, Fe, Ni) system

Sahu, M.[Manjulata], Rawat, D.[Deepak], Vats, B. G.[Bal Govind], Saxena, M. K., Dash, S.[Smruti]

ABSTRACT