Thermodynamics Research Center / ThermoML | Thermochimica Acta

Gibbs energy of formation of bismuth(III) oxide

Jacob, K. T., Mansoor, A. K.[Amal K.]
Thermochim. Acta 2016, 630, 90-96
ABSTRACT
The standard Gibbs energy of formation of Bi2O3 has been measured using a solid-state cell incorporating yttria-stabilized zirconia as the electrolyte and pure oxygen as the reference electrode. An innovative cell design, with a buffer electrode to absorb the electrochemical flux of oxygen through the electrolyte caused by trace electron/hole conduction, was used to measure the oxygen chemical potential over phase mixture Bi + Bi2O3 in the temperature range from 800 to 1473 K. A closed cell was used to avoid possible deviations from equilibrium caused by vaporization of bismuth and oxides of bismuth. The results for alpha-Bi2O3 in the temperature range from 800 to 1002 K can be summarized by, dGof(+-230)/J mol-1= -584235 + 289.28(T/K). For delta-Bi2O3 in the temperature range from 1002 to 1078 K: dGof(+-230)/J mol-1= -553669 + 258.77(T/K). The results are discussed in relation to thermodynamic information reported in the literature.
Compounds
# Formula Name
1 Bi2O3 bismuth oxide
2 O2 oxygen
3 Bi bismuth
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 of transition or fusion, kJ/mol ; Crystal 2
  • Crystal 2
  • Crystal 1
  • Air at 1 atmosphere
  • Derived from the emf measurements
  • 1
  • POMD
  • 1
  • Triple point temperature, K ; Crystal 2
  • Crystal 2
  • Crystal 1
  • Air at 1 atmosphere
  • Derived from the emf measurements
  • 1
  • RXND
  • 1
  • 3
  • 2
  • Molar enthalpy of reaction, kJ/mol
  • From e.m.f. measurements
  • 1
  • RXND
  • 1
  • 3
  • 2
  • Molar Gibbs energy of reaction, kJ/mol
  • Calculated from EMF cell potential
  • 11
  • RXND
  • 1
  • 3
  • 2
  • Molar Gibbs energy of reaction, kJ/mol
  • Calculated from EMF cell potential
  • 7
  • RXND
  • 1
  • 3
  • 2
  • Molar Gibbs energy of reaction, kJ/mol
  • Calculated from EMF cell potential
  • 16