A linked structural and electronic transition in Na0.63CoO2

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Authors

Colleges, School and Institutes

Abstract

A structural transition at 158 degrees C in Na0.63CoO2 is associated with a resistivity anomaly. Raman spectroscopy suggests a change in Na ordering at the transition and, for the first time, we have identified the nature of this rearrangement using variable temperature neutron powder diffraction. On heating, some Na ions migrate to the thermodynamically less stable (Na1) site from Na2, consistent with loss of an incommensurate superstructure. It is suggested that the change in Na order is linked to a change in the electronic band structure, which is reflected in the resistivity anomaly.

Details

Original languageEnglish
Pages (from-to)1342-
JournalJournal of Materials Chemistry
Volume18
Issue number12
Publication statusPublished - 1 Jan 2008