Thermochemistry of rare earth oxyhydroxides, REOOH (RE = Eu to Lu)

Shuhao Yang, Matthew Powell, Joseph W. Kolis, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

As intermediate products of the dehydration of hydroxides or the hydration of oxides, rare earth oxyhydroxides (REOOH) have important implications for synthesis and potential applications in luminescent devices. Using high temperature oxide melt solution calorimetry and thermal analysis, thermodynamic properties of REOOH (RE ​= ​Eu to Lu), including enthalpies of dehydration and formation, were determined. The exothermic enthalpies of formation from oxides and endothermic enthalpies of dehydration demonstrate that oxyhydroxides are not only synthetic but also thermodynamic intermediates in rare earth oxide - water systems. The linear relationship between enthalpies of formation from oxides and ionic radius of RE3+ confirms the key role of cation size in the stability of REOOH, and reveals that REOOH with lighter rare earth elements are easier to form and harder to dehydrate, both thermodynamically and kinetically.

Original languageEnglish (US)
Article number121344
JournalJournal of Solid State Chemistry
Volume287
DOIs
StatePublished - Jul 2020
Externally publishedYes

Keywords

  • Calorimetry
  • Dehydration enthalpy
  • Formation enthalpy
  • Rare earth oxyhydroxide

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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