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논문 기본 정보

자료유형
학술대회자료
저자정보
Khansur, Neamul Hayet (Dept. of Materials Sci. and Eng., Research center for Sustainable Eco-Devices and Materials [ReSEM], Chungju National University) Ur, Soon-Chul (Dept. of Materials Sci. and Eng., Research center for Sustainable Eco-Devices and Materials [ReSEM], Chungju National University) Yoon, Man-Soon (Dept. of Materials Sci. and Eng., Research center for Sustainable Eco-Devices and Materials [ReSEM], Chungju National University)
저널정보
한국재료학회 한국재료학회 학술발표대회 한국재료학회 2009년도 추계학술발표대회
발행연도
2009.1
수록면
311 - 311 (1page)

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In an approach to acclimate ourselves torecent ecological consciousness trend, a lead-free piezoelectric material, bismuth sodium titanate (abbreviated as BNT) based bismuth sodium barium titanate (abbreviated as BNT-BT), was considered as an environment-friendly alternative for a lead based piezoelectric system. Ceramic specimens of0.94[(BixNa0.5)TiO3]-0.06[BaTiO3] (x = 0.500~0.515) compositions were prepared by a modified mixed oxide method. To increase the chemical homogeneity andre action activity, high energy mechanical milling machine and pre-milled nanosized powder has been used. In this method (BixNa0.5)TiO3 (x=0.500~0.515) andBaTiO3 were prepared separately from pre-milled constituent materials at low calcination temperature and then separately prepared BNTX (X=1, 2, 3 and 4) and BT were mixed by high energy mechanical milling machine. Without further calcination step the mixed powders were pressed into disk shape and sintered at $1110^{\circ}C$. Microstructures, phase structures and electrical properties of the ceramic specimens were systematically investigated. Highly dense ceramic specimens with homogenous grains were prepared in spite of relatively low sintering temperature. Phase structures were not significantly influenced by the excess amount Bi. Large variation on the piezoelectric and dielectric properties was detected at relative high excess Bi amounts. When $x{\leq}0.505$, the specimens exhibit insignificant variation in piezoelectric and dielectric constant though depolarization temperature is found to be decreased. Considerable amount of decrease in piezoelectric and dielectric properties are observed with higher excess of Bi amounts ($x{\geq}0.505$). This research indicates the advantages of high energy mechanical milling and importance of proper maintenance of Bi stoichiometry.

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