Thermodynamic studies of CaLaFe11O19(s)

S. K. Rakshit, S. C. Parida, Kristina Lilova, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Thermodynamic studies on CaLaFe11O19(s) were carried out using Knudsen effusion mass spectrometry and calorimetry, viz. differential scanning calorimetry and high temperature oxide melt solution calorimetry. Standard molar Gibbs free energy of formation (ΔfG 0m), enthalpy of formation and heat capacity (C 0p, m) of the compound were calculated as a function of temperature for the first time. C0p, m(CaLaFe 11O19) was determined and used for second law analysis, from which enthalpy and entropy of formation of the compound were calculated and the respective values are: ΔfH0m(298.15 K)/kJ mol-1=-6057(±8) and S0m(298.15 K)/J K-1 mol-1=427(±5). ΔfH 0m(298.15 K)/kJ mol-1: -6055(±6) was also calculated using oxide melt solution calorimetry, which is in close agreement with the second law value. A heat capacity anomaly was also observed at T=684 K. A table of thermodynamic data from 298.15 K to 1000 K for CaLaFe11O19(s) was also constructed to represent an optimized set of data.

Original languageEnglish (US)
Pages (from-to)68-74
Number of pages7
JournalJournal of Solid State Chemistry
Volume201
DOIs
StatePublished - May 2013
Externally publishedYes

Keywords

  • Curie temperature
  • Differential scanning calorimetry (DSC)
  • Magnetic materials

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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