Temperature dependence of structural parameters in the perovskite Na0.74WO3

Charles Darlington, Joseph Hriljac, KS Knight

Research output: Contribution to journalArticle

3 Citations (Scopus)


NaxWO3 undergoes three phase transitions involving tilting of the oxygen octahedra about <100 > pseudocubic directions. We have measured the temperature dependence of the lattice parameters between 200 and 750 K - a temperature range that spans the three transitions - and determined the evolution of the structure within each phase as temperature changes. The experiments were performed on the highresolution powder diffractometer HRPD, Rutherford Appleton Laboratory, UK, using time-of-flight neutron diffraction. The critical exponent that describes the temperature dependence of the total tilt angle has been evaluated. An unexpected change in the thermal expansion coefficient in the cubic phase is not understood: an argument based on Landau's theory of phase transitions is used to demonstrate that the change is not the result of co-existence of two phases.
Original languageEnglish
Pages (from-to)854-868
Number of pages15
JournalPhysica Status Solidi B-Basic Solid State Physics
Issue number4
Publication statusPublished - 1 Jan 2005


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