초록 close

In this study, microstructural, dielectric and electrical properties of (Pb0.83) (La0.2Ce0.8)0.08TiO3(PCT) ceramics as a function of MnO2 addition and electrode size variation were investigated for 30 MHz high frequency ceramic resonator application. Grain size was gradually increased according to the increase of MnO2 addition amount. Moreover, the density showed a constant value with increasing MnO2 addition amount. Dielectric constant was decreased with increasing MnO2 addition amount. Curie temperature of all the composition ceramics was nearly constant around 330℃. The maximum D.R.of 50.5 dB and maximum Qmt3 of 1842 in the 3rd overtone vibration mode were appeared at the composition of 0.3wt% MnO2, respectively.