비납계 (Bi1/2Na1/2)TiO3 . Ba(Cu1/3Nb2/3)O3 세라믹의 압전 및 변위 특성

류정호; 정대용; Jungho Ryu; Dae-Yong Jeong

Korean Journal of Materials Research, Vol.21, No.11, 628-633, November, 2011

DOI10.3740/MRSK.2011.21.11.628 Export Citation

비납계 (Bi1/2Na1/2)TiO3 . Ba(Cu1/3Nb2/3)O3 세라믹의 압전 및 변위 특성

Piezoelectric and Strain Properties of Lead-free (Bi1/2Na1/2)TiO3 . Ba(Cu1/3Nb2/3)O3 Ceramics

류정호, 정대용^{1, †}

재료연구소 기능세라믹 그룹
¹인하대학교 신소재공학부

Jungho Ryu, and Dae-Yong Jeong^{1, †}

Functional Ceramics Research Group, Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam 641-831, Korea
¹School of Materials Engineering, Inha University, Incheon 402-751, Korea

E-mail:

Studies on lead-free piezoelectrics have been attractive as means of meeting environmental requirements. We synthesized lead-free piezoelectric (Bi1/2Na1/2)TiO3.Ba(Cu1/3Nb2/3)O3 (BNT-BCN) ceramics, and their dielectric, piezoelectric, and strain behavior were characterized. As BCN with a tetragonal phase was incorporated into the rhombohedral BNT lattice, the lattice constant increased. A small amount of BCN increased the density and dielectric constant forming the complete solid solution with BNT. However, BCN above 10 mol% was precipitated into a separate phase, and which was detected with XRD. In addition, EDX measurement revealed that Cu in BCN was not distributed homogeneously but was accumulated in a certain area. A lower density with a large amount of BCN was attributed to the nonsinterable property of BCN with large tetragonaliy. The dielectric constant vs the temperature change and the strain vs the electric field indicated that the ferroelectric property of BNT was diminished and paraelectric behavior was enhanced with the BCN addition. BNT-7.5BCN showed a 0.11% unimorph strain with a 9.0 kV/mm electric field with little hysteresis.

Keywords:piezoelectric;(Bi1/2Na1/2)TiO3 - Ba(Cu1/3Nb2/3)O3;lead free;strain

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[2] Lee EG, Lee J, Korean J. Mater. Res., 21(7), 391 (2011)

[3] Ryu J, Choi JJ, Hahn BD, Park DS, Yoon WH, Kim KH, Appl. Phys. Lett., 90, 20

[4] Demartin Maeder M, Damjanovic D, Setter N, J. Electroceramics, 13, 385 (2004)

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[15] Maurya D, Ahn CW, Zhang SJ, Priya S, J. Am. Ceram. Soc., 93(5), 1225 (2010)