High sensitivity or "soft" ceramics feature high sensitivity and permittivity, but under high drive conditions are susceptible to self heating beyond their operating temperature range . These materials are used in various pick-ups and sensors, low-power motor-type transducers, receivers, and low power generators.
The PZT500 series materials are all “soft” and fall between DOD Categories II and VI. They range in Curie temperatures from 165°C to 370°C. All these materials have been optimised for charge constants or coupling coefficients for specific applications. PZT5A series is often used as the receiver or generator element in hydrophones, accelerometers, and vibration sensors. PZT5A Series is a lead zirconate titanate with a high sensitivity, permittivity, and time stability. PZT502 and PZT503 are used as alternatives to PZT5A series materials when higher sensitivity is required. Both PZT502 and PZT503 have high acoustic sensitivity, and high coupling, whiles maintaining a high permittivity. PZT5H series is used in sensitive receivers and applications requiring fine movement control. It has been used in a wide range of applications from hydrophones to ink jet printers. PZT5H Series provides extremely high permittivity, coupling, and piezoelectric constant. PZT507 and PZT508 have been specifically formulated to surpass the electrical performance of PZT5H series materials. PZT5J1 material is used in fuses, hydrophones, and other applications that require a combination of high energy and high voltage output.
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