High-temperature, structural disorder, phase transitions, and piezoelectric properties of GaPO4

J. Haines, O. Cambon, N. Prudhomme, G. Fraysse, D. A. Keen, L. C. Chapon, and M. G. Tucker
Phys. Rev. B 73, 014103 – Published 6 January 2006

Abstract

Gallium orthophosphate was studied at high temperature up to 1303K by total neutron scattering and 1173K by piezoelectric measurements. Rietveld refinements at 1223K confirm the stability of the structural distortion in the α-quartz-type phase with an average tilt angle δ=18.8° at this temperature. In contrast, reverse Monte Carlo (RMC) refinements of total neutron scattering data indicate that, whereas the degree of structural disorder initially slowly varies over a very large temperature interval in the α-quartz-type phase, an increase in disorder is observed beginning above 1023K. Piezoelectric measurements indicate that the quality factor (Q) of GaPO4 resonators remains stable up to this temperature above which the piezoelectric properties of the material degrade. This degradation can be correlated to the increase in structural disorder. RMC refinements indicate that the high-temperature β-cristobalite-type phase at 1303K is characterized by significant thermally induced disorder with oxygen atom density forming a continuous ring around the vector joining neighboring gallium and phosphorous atoms. Gallium phosphate may be expected to retain its piezoelectric properties up to within 200K of the phase transition temperature and as a consequence be used in applications at temperatures slightly above 1000K.

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  • Received 15 September 2005

DOI:https://doi.org/10.1103/PhysRevB.73.014103

©2006 American Physical Society

Authors & Affiliations

J. Haines*, O. Cambon, N. Prudhomme, and G. Fraysse

  • Laboratoire de Physico-Chimie de la Matière Condensée, UMR CNRS 5617, Université Montpellier II, Place Eugène Bataillon, cc003, 34095 Montpellier cedex 5, France

D. A. Keen

  • Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom
  • and ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom

L. C. Chapon

  • ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom

M. G. Tucker

  • Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, United Kingdom

  • *Author to whom correspondence should be addressed. Emailaddress: jhaines@lpmc.univ-montp2.fr

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Vol. 73, Iss. 1 — 1 January 2006

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