| Title |
Piezoelectric Characteristics of Pb(Mnsub 1/3Nb 23)Osub 3-Pb(Zr, Ti)Osub 3 Ceramics with CeO_2 Impurity for the Piezoelectric Transformer |
| Authors |
류주현(Ryu, Ju-Hyeon) ; 서성재(Seo, Seong-Jae) |
| Keywords |
Mechanical quality factor(Q_m) ; Electromechanical coupling coefficient(k_p) ; Rosen type piezoelectric transformer ; Voltage step-up ratios |
| Abstract |
Piezoelectric properties of PMN-PZT ceramics with CeO_2 impurity were investigated. Mechanical quality factor, Q_m of 1792, 1285 and the electromechanical coupling coefficient, k_p of 0.52, 0.54 were obtained from the specimen with 0.25 and 0.5 mole % CeO_2 respectively. Curie temperature was decreased with the addition of CeO_2 while the electric coercive field was proportional to the amount of impurity. Based on the system ceramics with 0.5 mole % cerium oxide, a Rosen type piezoelectric transformer was fabricated and tested. Voltage step-up ratios of 230 and 13 were obtained from the transformer at no load and 100 kΩ resistance, respectively. Experimental results showed a potential of the transformer for the practical use coupled with the expected strength increase by the grain size refinement. |