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J. Korean Ceram. Soc. > Volume 33(6); 1996 > Article
Journal of the Korean Ceramic Society 1996;33(6): 672.
(Pb,La)$TiO_3$ 강유전체 세라믹에서 분역반전과 Acoustic Emission의 관계
최동구, 최시경
한국과학기술원 재료공학과
The Relationship between Domain Switching and Acoustic Emission in (Pb,La)$TiO_3$ Ferroelectric Ceramacs
ABSTRACT
The relationship between domain switching and acoustic emission (AE) during poling was investigated using the tetragonal ferroelectric ceramics with composition of (Pb,La)TiO3+0.01MnO2 The amount of AE generation during poling increased with increasing dc electric field and raising temperature. It was confirmed that the change of the amount of AE generation with poling condition resulted from the difference of the amount of 90$^{circ}$ domain switching and total amount of AE generation for 10 minutes was approximately proportional to the amount of 90$^{circ}$domain switching. The A generations of two specimens which have different tetragonality rations(c/s rations) 15 at% and 24at% La-doped were also investigated. The sample with c/a ratio of 1.012 where 90$^{circ}$ domains are dominate had larger amount of AE generation and 90$^{circ}$ domain switching compared with the sample with c/a ratio of 1.004 where 180$^{circ}$ domains are dominant.
Key words: Ferroelectric ceramics, Poling Acoustic, emission, Domain switching
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