Energetics of La2-xSrxCuO4-y solid solutions (0.0 ≤ x ≤ 1.0)

Joseph Bularzik, Alexandra Navrotsky, Joseph DiCarlo, Joseph Bringley, Bruce Scott, Steven Trail

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

Compounds in the La2-xSrxCuO4-y series have been synthesized in the single phase range 0 ≤ x ≤ 1. High temperature solution calorimetry in molten lead borate was used to determine the heats of formation from oxide components. The enthalpy of formation becomes more exothermic with increasing Sr substitution 0 ≤ x ≤ 0.15 and then remains approximately constant for 0.15 ≤ x ≤ 1. This trend can be explained by the balance between the (formal) substitution La3+ + Cu2+ = Sr2+ + Cu3+ and the loss of oxygen, keeping copper formally divalent but creating oxygen vacancies. Using a transposed temperature drop method, the heat of oxidation was determined to be -129 kJ/(mole O2) by a comparison of samples with the same strontium content but a different oxygen content.

Original languageEnglish (US)
Pages (from-to)418-429
Number of pages12
JournalJournal of Solid State Chemistry
Volume93
Issue number2
DOIs
StatePublished - Aug 1991
Externally publishedYes

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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