| $(Pb, Nd)(Ti, Mn)O_3$ 세라믹의 유전 및 압전특성 |
| 임주수, 신혁재, 오태희1, 김종희1, 송병무1, 이재신 |
울산대학교 재료공학과 금속공학과
1쌍용양회공업(주) 주앙연구소 |
| Dielectric and Piezoelectric Properties of $(Pb, Nd)(Ti, Mn)O_3$ Ceramics |
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| ABSTRACT |
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Dielectric and piezoelectric properties of (Pb1-1.5xLnx)(Ti0.98Mn0.02)O3 ceramics with x=0~0.2 have been investigated. Pb(Ti0.98Mn0.02)O3 showed poor sinterability and cracking on cooling, but the substitution of Nd3+ ions into Pb2+ sites resulted in dense microstructures without cracking through reducing crystallographic anisotropy. The Nd3+ substitution, however, deteriorated the temperature stability of the piezoelectric properties because of lowering the Curie point. Electromechanical anisotropy(Kt/Kp) indicated a maximum value of 10 when x=0.1. This result might be attributed to the counteracting effects that with increasing x, the lattice anisotropy decreases while the poling becomes easier due to the increase in O2- vacancy concentration. Thickness-shear mode resonators with (Pb0.85Nd0.1)(Ti0.98Mn0.02)O3 composition showed good resonant characteristics around 4.5 MHz. |
| Key words:
Lead titanate, Piezoelectric ceramics, Neodymium, Ceramic resonator |
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