Thermodynamics Research Center / ThermoML | Thermochimica Acta

Studies on the thermal decomposition of lanthanum(III) valerate and lanthanum(III) caproate in argon

Grivel, J.-C., Zhao, Y., Suarez Guevara, M. J., Watenphul, A.
Thermochim. Acta 2015, 612, 1-9
ABSTRACT
The decomposition of La-valerate (La(C4H9CO2)3 xH2O (x 0.45)) and La-caproate (La(C5H11CO2)3 xH2O (x 0.30)) was studied upon heating at 5 C/min in a flow of argon. Using a variety of techniques including simultaneous TG-DTA, FTIR, X-ray diffraction with both laboratory Cu Ka and synchrotron sources as well as hot-stage microscopy, it was found that both compounds melt prior to decomposition and that the main decomposition stage from the molten, anhydrous state leads to the formation of La-dioxycarbonate (La2O2CO3) via an unstable intermediate product and release of symmetrical ketones. Final decomposition to La2O3 takes place with release of CO2.
Compounds
# Formula Name
1 C15H27LaO6 lanthanum(III) pentanoate
2 C18H33LaO6 lanthanum(III) hexanoate
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
  • Triple point temperature, K ; Crystal 2
  • Crystal 2
  • Crystal 1
  • Air at 1 atmosphere
  • DTA
  • 1
  • POMD
  • 1
  • Triple point temperature, K ; Crystal 1
  • Crystal 1
  • Smectic liquid crystal
  • Air at 1 atmosphere
  • DTA
  • 1
  • POMD
  • 1
  • Triple point temperature, K ; Smectic liquid crystal
  • Smectic liquid crystal
  • Liquid
  • Air at 1 atmosphere
  • DTA
  • 1
  • POMD
  • 1
  • Molar enthalpy of transition or fusion, kJ/mol ; Crystal 1
  • Crystal 1
  • Smectic liquid crystal
  • Air at 1 atmosphere
  • DSC
  • 1
  • POMD
  • 1
  • Molar enthalpy of transition or fusion, kJ/mol ; Smectic liquid crystal
  • Smectic liquid crystal
  • Liquid
  • Air at 1 atmosphere
  • DSC
  • 1
  • POMD
  • 2
  • Triple point temperature, K ; Crystal 2
  • Crystal 2
  • Crystal 1
  • Air at 1 atmosphere
  • DTA
  • 1
  • POMD
  • 2
  • Triple point temperature, K ; Crystal 1
  • Crystal 1
  • Smectic liquid crystal
  • Air at 1 atmosphere
  • DTA
  • 1
  • POMD
  • 2
  • Triple point temperature, K ; Smectic liquid crystal
  • Smectic liquid crystal
  • Liquid
  • Air at 1 atmosphere
  • DTA
  • 1
  • POMD
  • 2
  • Molar enthalpy of transition or fusion, kJ/mol ; Crystal 2
  • Crystal 2
  • Crystal 1
  • Air at 1 atmosphere
  • DSC
  • 1
  • POMD
  • 2
  • Molar enthalpy of transition or fusion, kJ/mol ; Crystal 1
  • Crystal 1
  • Smectic liquid crystal
  • Air at 1 atmosphere
  • DSC
  • 1
  • POMD
  • 2
  • Molar enthalpy of transition or fusion, kJ/mol ; Smectic liquid crystal
  • Smectic liquid crystal
  • Liquid
  • Air at 1 atmosphere
  • DSC
  • 1