Heat capacities of PbBi12O19(s) and phi-Pb5Bi8O17(s) were measured by differential scanning calorimetry in the temperature range 280 820K and 280 660 K, respectively. PbBi12O19(s) and phi-Pb5Bi8O17(s) showed order disorder transitions whose onset temperatures are 520K and 700 K, respectively. The measured heat capacities of PbBi12O19(s) and phi-Pb5Bi8O17(s) as a function of temperature are expressed as: Cp < PbBi12O19 > (JK-1 mol-1) = 791.68 + 112.18 * 10-3 T - 13.58 * 106 T -2 (280 - 820 K) Cp < phi-Pb5Bi8O17 > (JK-1 mol-1) = 700.02 + 161.58 * 10-3 T - 12.85 * 106 T -2 (280 - 660 K) Enthalpy increments, entropies and Gibbs energy functions were derived from the measured heat capacity data.
Compounds
#
Formula
Name
1
Bi12O19Pb
bismuth lead oxide Bi12PbO19
2
Bi8O17Pb5
bismuth lead oxide Bi8Pb5O17
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 heat capacity at constant pressure, J/K/mol ; Crystal
Temperature, K; Crystal
Pressure, kPa; Crystal
Crystal
Small sample (50 mg) DSC
7
POMD
2
Molar heat capacity at constant pressure, J/K/mol ; Crystal