Preparation of piezoelectric quartz unseeded acoustic surface wafer
A piezoelectric crystal, seedless technology, applied in chemical instruments and methods, crystal growth, single crystal growth, etc., can solve the problems of low yield and material utilization, small electromechanical coupling coefficient, shortened production cycle, etc. The effect of improving yield and material utilization, eliminating angle deviation, and shortening production cycle
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[0015] The present invention will be further described below in conjunction with specific examples.
[0016] The preparation method of the piezoelectric crystal seedless crystal acoustic watch chip comprises the following steps:
[0017] a. Select a piezoelectric substrate with a surface acoustic wave propagation direction angle and a size of 2 to 6 inches as the seed crystal, which is a crystal wafer with a low corrosion tunnel density (within 50) at the surface acoustic wave propagation direction angle;
[0018] b. Place the above-mentioned seed crystal in the autoclave through the "Z" shape tool holder;
[0019] c. fill sodium hydroxide, sodium carbonate alkali solution in above-mentioned autoclave, seed crystal is placed on the top of autoclave, the raw material that dissolving is placed on the bottom of autoclave, makes solution upward convection move;
[0020] d. Use the hydrothermal temperature difference method of the five-stage automatic power control type to control...
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