무연 BNBT 세라믹스의 압전특성에 미치는 La 2 O 3 의 영향

손영진; 윤만순; 어순철; Young-Jin Son; Man-Soon Yoon; Soon-Chul Ur

Korean Journal of Materials Research, Vol.15, No.12, 756-759, December, 2005

DOI10.3740/MRSK.2005.15.12.756 Export Citation

무연 BNBT 세라믹스의 압전특성에 미치는 La 2 O 3 의 영향

Effects of La 2 O 3 on the Piezoelectric Properties of Lead-Free (Bi 0.5 Na 0.5 ) 0.94 Ba 0.06 TiO 3 Piezoelectric Ceramics

손영진, 윤만순, 어순철 ^†

충주대학교 신소재공학과/친환경 에너지 변환 저장 소재 및 부품개발 연구센터

Young-Jin Son, Man-Soon Yoon, and Soon-Chul Ur^†

Department of Materials Science and Engineering/Research Center for Sustainble ECo-Devices and Materials (ReSEM), Chungju National University, Chungju, Chungbuk 380-702, Korea

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A lead free piezoelectric material, bismuth sodium barium titanate (Bi 0.5 Na 0.5 ) 0.94 Ba 0.06 TiO 3 (BNBT), was considered as an environment-friendly alternatives for the current PZT system. A perovskite BNBT was synthesized by conventional bulk ceramic processing technique. In order to improve piezoelectric properties, La 2 O 3 as a dopant was incorporated into the BNBT system up to 0.025 moi, ana the effects on subsequent the piezoelectric ana dielectric properties were systematically investigated. With increasing La 2 O 3 contents, the equilibrium grain shape was remarkably evidenced and sintered density was increased. Piezoelectric and dielectric properties were s]town to have maximum values at the La 2 O 3 contents of 0.02 mol. La 3+ ions seemed to act as a softener in the BNBT system and to enhance dielectric and piezoelectric properties in this study.

Keywords:BNBT;Lead-free piezoelectric;doping

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[1] Long J, Chen H, Meng Z, Mater. Sci. Eng. B, 99, 445 (2003)

[2] Setter N, Piezoelectric Materials in Devices, Ceramics Laboratory, EPFL, Swiss, p.389 (2002) (2002)

[3] Nagata H, Takenaka T, J. of Euro. Ceram. Soc., 21, 1299 (2001)

[4] Smolenskii GA, Isupov VA, Agranovskaya AI, Krainik NN, Sov. Phys. -Solid State, 2, 2651 (1961)

[5] Chu BJ, Chen DR, Lia GR, Yin QR, J. of Euro. Ceram. Soc., 22, 2115 (2002)

[6] Takenaka T, Maruyama K, Sakata K, Jpn. J. of Appl. Phys., 30, 2236 (1991)

[7] IRE Standards on Piezoelectric Crystals, Measurements of Piezoelectric Ceramics, Proc., 49, 1161 (1961) (1961)

[8] Peng C, Li JF, Gong W, Mater. Letters, 59, 1576 (2005)

[9] Porter DA, Easterling KE, Phase Transformations in Metals and Alloys, 2nd Edition, Chapman & Hall, p.115 (1989) (1989)

[10] Jaffe B, Piezoelectric ceramics, Academic Press, New York, p.237, (1971) (1971)

[11] Yamamoto T, Am. Ceram. Soc. Bull., 71, 978 (1992)

[12] Kim MJ, Choi SC, J. Kor. Ceram. Soc., 36, 1108 (1999)