C. MICLEA, C. TĂNĂSOIU, L. AMARANDE, C.F. MICLEA, C. PLĂVIŢU, M. CIOANGHER, L. TRUPINA, C.T. MICLEA, C. DAVID
Effect of Temperature on The Main Piezoelectric Parameters of A Soft PZT Ceramic

Abstract. The temperature behavior of the main piezoelectric parameters, such as the electromechanical coupling factor kp, the mechanical quality factor Qm, the dielectric permittivity ε (real and imaginary part), the loss tangent tan δ, the piezoelectric charge constants d33 and d31 and the voltage constants g33 and g31 of a soft type piezoelectric material was investigated. The results showed that temperatures under 150°C do not influence these parameters, which indicate that every transducer made from this type of material may be successfully used up to this temperature. Between 150°C and 250°C, the piezoelectric properties undergo more or less important changes, mainly due to the depoling effect and above that, at temperatures over 250°C, they degrade very rapidly, tending to zero.

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