Variations of Piezoelectric Properties and Compressive Strength of PZT Ceramics with Poling Directions

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J. Korean Ceram. Soc. > Volume 32(10); 1995 > Article

Journal of the Korean Ceramic Society 1995;32(10): 1131.

분극방향에 따른 PZT 세라믹스의 압전특성 및 압축파괴강도의 변화

임진호, 손준호, 김정주, 박병옥, 조상희

경북대학교 무기재료공학과

Variations of Piezoelectric Properties and Compressive Strength of PZT Ceramics with Poling Directions

ABSTRACT

Variations of piezoelectric properties and compressive strength of Sr-doped PZT ceramics were investigated with poling direction. The electro-mechanical coupling constants (k31 and k33) were increased linearly with increasing poling strength. The volume fraction of intergranular fracture also increased with incresing poling strength due to weakening of grain boundaries by domain rearrangement during poling process. The internal stresses induced from the poling at 2.5 kV/mm parallel and perpendicular to the poling direction poled were 405 MPa and 89 MPa, respectively. The compressive strength of the specimen poled parallel to the poling direction was higher than that perpendicular to the poling direction.

Key words: PZT, Poling, Compressive strength, Internal stress