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

Jean-Claude Grivel, Zhao Yue, Maria Josefina Suarez Guevara, A. Watenphul

Research output: Contribution to journalJournal articleResearchpeer-review

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 Kα 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.
Original languageEnglish
JournalThermochimica Acta
Volume612
Pages (from-to)1-9
Number of pages9
ISSN0040-6031
DOIs
Publication statusPublished - 2015

Keywords

  • Caproate
  • FTIR
  • Lanthanum
  • Simultaneous TG-DTA
  • Thermal decomposition
  • Valerate
  • Decomposition
  • Differential thermal analysis
  • Ketones
  • Pyrolysis
  • X ray diffraction
  • Hot-stage microscopy
  • Intermediate product
  • Lanthanum(III)
  • Synchrotron source

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