The hydrothermal growth of alpha-quartz and the nature of the physico-chemical defects detected in the resulting crystal
Résumé
The development of α-quartz for high frequencies devices leads to a strong reduction of the thickness of the piezoelectric sheet. Such a thickness is comparable to the size of the defects. Consequently, the main objective for the improvement of the performances of α-quartz used as a piezoelectric material is to reduce the density of physico-chemical defects.
Our work has been focussed in two directions:
(i) the identification of different physico-chemical defects using the overlap of different techniques (X-ray topography, IR spectroscopy, Cathodoluminescence, Thermo-luminescence, EPR,…)
(ii) attempts at improving the correlations between the different parameters governing the hydrothermal crystal growth of a-quartz and the nature or the density of defects.
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