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Temperature Dependence of the Main Piezoelectric Parameters of a Nb-Li Doped Pzt Ceramic

By: Tanasoiu, C.; Miclea, C.; David, C.; Miclea, C.T.; Trupina, L.; Cioangher, M.; Amarande, L.;

2006 / IEEE / 1-4244-0109-7

Description

This item was taken from the IEEE Conference ' Temperature Dependence of the Main Piezoelectric Parameters of a Nb-Li Doped Pzt Ceramic ' A study was made on the temperature behavior of the main piezoelectric parameters, namely the electromechanical coupling factor kp, the mechanical quality factor Qm, the dielectric permittivity ¿ (real and imaginary part), the loss tangent tg¿ and the piezoelectric charge constants d33 and d31 of a soft type piezoelectric material. It was evidenced that temperatures under 150°C do not influence these parameters, which means that every transducer made from this type of material may be successfully used up to this temperature. Between 150oC and 250°C, the piezoelectric properties undergo more or less important changes, mainly due to the depoling effect. After that, at temperatures over 250°C, they degrade very rapidly, tending to zero.