Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Thermodynamic properties of Pr7O12

Jacob, K.T., Muraleedharan, S.[Srilekshmi]
J. Chem. Thermodyn. 2019, 136, 54-58
ABSTRACT
To explore the potential of Pr7O12 in a biphasic oxygen buffer in automobile exhaust control systems, thermodynamic data for Pr7O12 are required. Since there is no information on Pr7O12 in thermodynamic data compilations, its Gibbs energy of formation has been determined relative to that of Pr2O3 as a function of temperature in the range from 850 to 1200 K using a solid-state electrochemical technique. The standard molar Gibbs energy of formation of Pr7O12 from elements can be represented by two equations. In the range from 850 to 1068 K, DG f (J mol-1) = -6454317 + 1085.52 (T/K). From 1068 to 1204 K, DG f (J mol-1) = -6467695 + 1097.77 (T/K).
Compounds
# Formula Name
1 O3Pr2 praseodymium oxide (Pr2O3)
2 O2 oxygen
3 O12Pr7 praseodymium oxide (Pr7O12)
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
  • 3
  • Mass density, kg/m3 ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • X-ray diffraction
  • 1
  • RXND
  • 1
  • 3
  • 2
  • Molar Gibbs energy of reaction, kJ/mol
  • Calculated from EMF cell potential
  • 15