Abstract
DIFFERENT types of deformation extend the range of frequencies that quartz plates can cover and a single plate may be used for totally different ranges when made to vibrate in different modes. To obtain most of these various modes of vibration the plates must be cut from the mother quartz at different angles with respect to the electrical, mechanical and optical axes of the quartz crystal. There are also special orientations which provide better frequency stability in cases of temperature changes, and these orientations are used where stringent temperature requirements apply.
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Quartz Crystal Model. Nature 154, 405 (1944). https://doi.org/10.1038/154405a0
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DOI: https://doi.org/10.1038/154405a0