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Abstract
α-quartz is an important piezoelectric material used in particular for its high frequency stability.
The increase of the power of high frequency oscillators implies α-quartz single crystal with a low concentration of defects.
Due to the low-temperature transition α → β quartz, the hydrothermal synthesis was selected to grow a-quartz single crystals.
On the basis of an analysis of the different factors able to induce physical and chemical defects in this lattice, new solvents and specific experimental (P, T) conditions have been investigated.