Thermodynamic study of orthorhombic Tx and tetragonal T′ lanthanum cuprate, La2CuO4

K. I. Lilova, R. Hord, L. Alff, B. Albert, A. Navrotsky

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The enthalpies of transition among the Tx, T′, and T-La2CuO4 phases are obtained from a combination of differential scanning calorimetry, high temperature oxide melt solution calorimetry, and transposed temperature drop calorimetry. The enthalpy of transformation of Tx to T is 2.32 ± 0.07 kJ/mol and the corresponding entropy of transition is 4.38 ± 0.13 J/(mol K). The T′ modification, with an average of 1.40 kJ/mol, is less stable in enthalpy than Tx but at 0.96 kJ/mol, more stable in enthalpy than T. Although we cannot rule out a small stability field at temperatures near the Tx-T transition at 530 K, T′ is most likely metastable at all temperatures.

Original languageEnglish (US)
Pages (from-to)91-94
Number of pages4
JournalJournal of Solid State Chemistry
StatePublished - 2013
Externally publishedYes


  • High-temperature calorimetry
  • High-temperature superconductor
  • Thermodynamics
  • Transition enthalpies

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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