RESEARCH ON HIGH POWER TRANSDUCER CERAMICS. STRESS SENSITIVITY OF PIEZOELECTRIC CERAMICS: PART II: HEAT TREATMENT.
CLEVITE CORP CLEVELAND OH ELECTRONIC RESEARCH DIV
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The large rise in permittivity experienced by transducer ceramics when subjected to stress parallel to the polar axis can reduce the utility of these materials. Measurements are described on PZT-4 and PZT-8, representative of ceramics useful for high power high stress applications, for which a stabilizing heat treatment has reduced the change in permittivity. It is shown that the stabilizing effect is permanent. Several stress cycles to 10 to 20 kpsi also stabilize these ceramics. It is shown that the stabilization with stress for stress cycles to 10 kpsi is not permanent. Measurements were made over an aging range from one day to six months. Author
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