Quartz Growth on X-Seeds.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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According to the present invention, dislocation-free quartz crystal boules, which are especially valuable for use in frequency and timing device applications, can be produced by utilizing a seed crystal cut or sliced from the X-plus region of a synthetically grown quartz boule. The seed crystal takes the form of a rectangular prism shaped slab or plate with its length directed along the crystallographic Y-axis orientation, its width directed along the X-axis orientation, its width directed along the X-axis orientation, and its thickness in the Z-axis orientation. Accordingly, the primary object of this invention is to provide synthetic quartz seed crystals for use in growing substantially dislocation-free quartz crystal boules for use in timing and frequency devices. Another object of this invention is to greatly reduce the number of dislocations and other defects in synthetic quartz grown for oscillator applications. Still another object of this invention is to provide Z-faced quartz seed crystals cut or sliced from the X-plus growing region of a quartx crystal boule.