The effect of PbO content on the properties of modified lead titanate ceramic resonator

The effect of PbO content which varied from 72 to 87 mole% on the resonator properties of ceramics Pb_1-1-5xLa_xTiO₃ + 0.5 wt% MnO₂ (with x=0.12) has been examined. The mechanical quality factor Qm increases with the PbO content. On the other hand, in the deficient case of PbO, the dielectric constant E T3 3 and the temperature coefficient TCF₃ decrease; the mechanical quality factor Qm_t3 and the coupling factor k_t3 increase which make certain improvement on the ceramic resonators utilizing third harmonic thickness vibration when compared with stoichiometric PbO content (82 mole%).