Numéro |
J. Phys. IV France
Volume 126, June 2005
|
|
---|---|---|
Page(s) | 27 - 30 | |
DOI | https://doi.org/10.1051/jp4:2005126006 |
J. Phys. IV France 126 (2005) 27-30
DOI: 10.1051/jp4:2005126006
Piezoelectric properties at high temperature in
-quartz
materials
O. Cambon1, J. Haines1, G. Fraysse1, D.A. Keen2 and M.G. Tucker3 1 Université Montpellier II, Laboratoire de Physicochimie de la Matière Condensée, UMR CNRS 5617, Place E. Bataillon, 34095 Montpellier Cedex 05, France
2 Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, UK and ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
3 Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
Abstract
The performances of resonators made of -quartz
and GaPO4 are compared based on piezoelectric measurements up to 850°C. Up to now, no explanation was available for the observed decrease in
piezoelectric performances well below the phase transition temperature in
these materials. Total neutron scattering measurements were used to
determine the instantaneous structural disorder as a function of
temperature. The losses of piezoelectric properties measured above 700
C
for GaPO4 can thus be correlated to an important degree of structural
disorder, which is evaluated by various angular distributions. The
distribution of the intertetrahedral O-O-O bridging angle values becomes
very wide for this material between 700 and 800
C. The relative movement
of the tetrahedra can provide an explanation for the observed piezoelectric
losses well before the phase transition.
© EDP Sciences 2005