PMN계 완화형 강유전체에서의 압전물성

박재환; 박재관; 김윤호; 박순자; Jae-Hwan Park; Jae-Gwan Park; Yoonho Kirn; Soon Ja Park

Korean Journal of Materials Research, Vol.9, No.3, 240-243, March, 1999

Export Citation

PMN계 완화형 강유전체에서의 압전물성

Piezoelectric Properties in PMN-based Relaxor Ferroelectrics

박재환, 박재관, 김윤호, 박순자 ¹

한국과학기술연구원 재료연구부
¹서울대학교 재료공학부

Jae-Hwan Park, Jae-Gwan Park, Yoonho Kirn, and Soon Ja Park¹

Materials Science and Technology Division, Korea lnstitute of Science and Technology, Seoul 130-650, Korea
¹School of Material Science, Seoul National University, Seoul 151-742, Korea

초록

0.9PMN-0.1PT계의 압전물성을 상전이 온도를 포함하는 -40℃~100℃의 넓은 온도범위에서 조사하였다. 압전물성의 측정을 위해 상전이 온도 이하인 -40℃에서 시편을 분극처리를 한 후 승온하면서 공진반공진법에 의해 측정하였다. 0℃ 이하에서 압전체의 필요충분조건인 압전 spectrum이 선명하게 나타남을 통해서 상전이 온도보다 충분히 낮은 온도에서 0.9PMN-0.1PT가 압저체임을 확인하였다. 상전이온도인 40℃보다 훨씬 높은 90℃ 정도의 온도에서도 압전 spectrum이 관찰되고 있음을 통해서 0.9PMN-0.1PT 완화형 강유전체의 경우 상전이온도 이상에서도 전기기계 변환이 일어나고 있으며 강유전체인 압전체의 성질을 띠고 있다는 것을 확인하였다.

Piezoelectric properties of 0.9PMN-0.1PT relaxor ferroelectrics were investigated in the temperature range of -40℃ ~100℃. After poled at -40℃, electro-mechanical properties of the samples were measured by resonanceantiresonance method. As the resonance behavior was shown in impedance spectrum obtained below 0℃, it can be conduded that 0.9PMN-0.1PT is bona-fide ferroelectrics below the phase transition temperature. It is very noteworthy that electro-mechanical resonance occurs at the temperatures far above the phase transition temperature. It is concluded that ferroelectricity in 0.9PMN-0.1PT relaxor were verified far above the phase transition temperature.

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[6] Park JH, Kim BK, Park SJ, J. Am. Ceram. Soc., 79(2), 430 (1996)

[7] Park JH, Hong KS, Park SJ, J. Appl. Phys., 81(4), 2039 (1997)

[8] Pilgrim SM, Massuda M, Prodey JD, Ritter AP, J. Am. Ceram. Soc., 75, 1964 (1992)

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[13] Jaffe B, Cook WR, Jaffe H, Piezoelectric Ceramics, Academic Press, London (1971).