Thermodynamics Research Center, ThermoML : Journal of Chemical Thermodynamics

Determination of thermodynamic properties of Bi2Mo3O12 (s), Bi2MoO6 (s) and Bi6Mo2O15 (s)

Aiswarya, P.M., Kumar, S. Shyam, Ganesan, R., Gnanasekaran, T.
J. Chem. Thermodyn. 2019, 139, 105886
ABSTRACT
The standard molar Gibbs energy of formation of monoclinic phase of Bi2MoO6 (s) was determined by measuring the equilibrium oxygen partial pressures in the Bi (l) - MoO2 (s) -Bi2MoO6 (s) phase field using solid electrolyte based emf cells and it is given by the following expression: deltafGm.deg.less thanBi2MoO6greater than+-0.9/kJmol-1=-1382.3+0.5064(T/K)(T:773-1023K) The molar heat capacities of Bi2Mo3O12 (s), Bi6Mo2O15 (s) and Bi2MoO6 (s) were experimentally measured employing a differential scanning calorimeter. The heat capacities measured over a temperature range is given by: CPless thanBi2Mo3O12greater than(JK-1mol-1)+-16.4=416.7-7.1*10-3T-8.8*106T-2(T:328-818K) CPless thanBi6Mo2O15greater than(JK-1mol-1)+-23.4=529.8+67.9*10-3T-6.3*106T-2(T:318-808K) CPless thanBi2MoO6greater than(JK-1mol-1)+-8.8=221.4-1.5*10-3T-3.9*106T-2(T:318-818K) The internal consistency of the measured thermodynamic data of Bi2MoO6 (s) has been verified.
Compounds
# Formula Name
1 Mo molybdenum
2 Bi bismuth
3 O2 oxygen
4 Bi2Mo3O12 bismuth molybdate (Bi2Mo3O12)
5 Bi2MoO6 bismuth molybdate (Bi2MoO6)
6 Bi6Mo2O15 bismuth molybdate (Bi6Mo2O15)
7 MoO3 molybdenum oxide (MoO3)
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
  • 4
  • Molar heat capacity at constant pressure, J/K/mol ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • DSC
  • 12
  • POMD
  • 5
  • Molar heat capacity at constant pressure, J/K/mol ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • DSC
  • 12
  • POMD
  • 6
  • Molar heat capacity at constant pressure, J/K/mol ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • DSC
  • 12
  • POMD
  • 7
  • Molar heat capacity at constant pressure, J/K/mol ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • DSC
  • 10
  • RXND
  • 1
  • 2
  • 5
  • 3
  • Molar enthalpy of reaction, kJ/mol
  • e.m.f. measurements
  • 1
  • RXND
  • 1
  • 2
  • 5
  • 3
  • Molar Gibbs energy of reaction, kJ/mol
  • Calculated from EMF cell potential
  • 11