Temperature characteristics of piezoelectric ceramics

1.Temperature characteristics are used in the high-precision positioning and some special applications, the temperature characteristics of piezoelectric ceramic can not be ignored. Piezo plate working crystal temperature characteristics are mainly manifested in two aspects: 1, linear expansion, this refers to the piezoelectric ceramic and elongate with the temperature changes, because the stacked type piezoelectric ceramic is made of multi-chip piezoelectric ceramic stick and then its linear expansion coefficient is both affected by the impact of piezo vibration plate with P5 material. Ceramic plate is also affected by the connection between the material.
2. The effect of temperature on the piezoelectric / electrostrictive effect Piezoelectric /electrostrictive ceramic, which output displacement decreases with temperature increasing, the reduction of piezo ring datasheet pzt 4 is smaller, in the range of 0 ℃ ~ 50 ℃, only reducing 5% to 8%, electrostrictive ceramics is reducing, the magnitude of  that rather  larger, in the range of 0 ℃ ~ 50 ℃ ,reduction is about 65%. The hysteresis of piezo plates and block / electrostrictive ceramics also changes with temperature, the change of PZT 5 piezo rings for flow measurement is smaller, and the change of electrostrictive ceramics is larger. The temperature characteristics of electrostrictive ceramics are limited its application in the field of high precision positioning.