Characterization of the structural transition in Na0.75CoO 2

Q. Huang, J. W. Lynn, B. H. Toby, M. L. Foo, R. J. Cava

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


In the NaxCoO2 chemical system, a two-phase region is found at ambient temperature near x = 0.75. The manner in which that two-phase region is formed on cooling from a uniform single phase at temperatures above 340 K is reported here. The driving force that induces the phase separation appears to be a difference in Na composition of the two phases, which, though small, is accompanied by substantial differences in the unit cell parameters. Hysteretic behaviour in the transition is observed. One of the phases exhibits negative thermal expansion in the narrow temperature region where the phases are in the process of separating.

Original languageEnglish (US)
Pages (from-to)1831-1840
Number of pages10
JournalJournal of Physics Condensed Matter
Issue number12
StatePublished - Mar 30 2005

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics


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