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

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...

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Veröffentlicht in:Physica Status Solidi (b) 2005-03, Vol.242 (4), p.854-868
Hauptverfasser: Darlington, C. N. W., Hriljac, J. A., Knight, K. S.
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Hriljac, J. A.
Knight, K. S.
description 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 high‐resolution 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. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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subjects 61.12.Ld
61.50.Ah
61.50.Ks
61.66.Fn
63.20.Ry
64.70.Kb
Exact sciences and technology
Physics
title Temperature dependence of structural parameters in the perovskite Na0.74WO3
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