PNN 치환에 따른 PMW-PNN-PZT-BF 세라믹스의 미세구조와 압전 특성 (Microstructure and Piezoelectric Properties of Low Temperature Sintering PMW-PNN-PZT-BF Ceramics According to PNN Substitution)

서지정보

· 발행기관 : 한국전기전자재료학회
· 수록지 정보 : 전기전자재료학회논문지 / 29권 / 2호 / 90 ~ 94페이지
· 저자명 : 신상훈, 류주현

초록

본 연구에서는 초음파 센서용 조성으로 응용을 위하여 우수한 압전성능지수(d33·g33)를 갖는 세라믹스를 개발하기 위하여,0.9925[Pb(Mg1/2W1/2)0.03(Ni1/3Nb2/3)x(Zr0.5Ti0.5)0.97-xO3 + 0.0075 BiFeO3 + 0.2wt%Li2CO3 + 0.25wt%CaCO3 조성에 PNN을 치환하는 실험을 통하여 세라믹스의 미세구조와 압전 및 강유전 특성에 미치는 영향을 조사한 결과. XRD 패턴의 결과 x=PNN 가 증가함에 따라 x= 0.08 까지는 정방정상(Tetragonal)을 확인하였으며, x= 0.10에서는 상경계(MPB)로 생각되며, x= 0.12 에서는 (002), (200) 피크가 점차 하나의 피크로 합쳐지며 능면체(Rhombohedral)상에 가까워지는 것으로 사료 된다.. PNN의 치환량이 x= 0.10 일 때의 시편에서 density= 7.82 g/cm3, kp= 0.61, εr= 2183, d33= 566 pC/N, g33= 29.28(10-3 mV/N),d33·g33=16.57 pm2/N으로 초음파센서응용에 적합한 특성을 얻었다.

영어초록

In this work, [Pb(Mg1/2W1/2)0.03(Ni1/3Nb2/3)x(Zr0.5Ti0.5)0.97-xO3-BiFeO3] (x= 0.02 to 0.12) composition ceramics were fabricated by the conventional soild state reaction method, their microstructure and ferroelectric properties were investigated according to the amount of PNN substitution. The addition of small amount of BiFeO3, Li2CO3, and CaCO3 were used inorder to decrease the sintering temperature of the ceramics. The x-ray diffraction patterns (XRD) of all ceramics exhibited a perovskite structure. The sinterability of PMW-PNN-PZT-BF ceramics was remarkably improved using liquid phase sintering of CaCO3, Li2CO3. However, it was identified from of the X-ray diffraction patterns that the secondary phase formed in grain boundaries decreased the piezoelectric properties. According to the substitution of PNN, the crystal structure of ceramics is transformed gradually from a tetragonal to rhombohedral phase. The x= 0.10 mol PNN-substituted PMW-PNN-PZT-BF ceramics sintered at 920℃ have the optimum values of piezoelectric constant(d33), piezoelectric figure of merit(d33·g33), planar piezoelectric coupling coefficient(kp) and density : d33= 566 [pC/N], g33= 29.28(10-3 mV/N).d33·g33=16.57 pm2/N.kp= 0.61, density= 7.82[g/cm3]. suitable for duplex ultrasonic sensor application.

참고자료

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