| 학회 | 한국재료학회 |
| 학술대회 | 2009년 가을 (11/05 ~ 11/06, 포항공과대학교) |
| 권호 | 15권 2호 |
| 발표분야 | B. Nanomaterilas Technology(나노소재 기술) |
| 제목 | Fabrication of Nano Sized Lead Free BNBT Piezoelectric Ceramics by Modified Mixed Oxide Method |
| 초록 | Abstract: To date, the most widely used piezoelectrics belong to the lead zirconate titanate (PZT) family because of its superior piezoelectric properties. However, the hazardous lead content present within these materials raises serious environmental concerns moreover the toxicity of lead presents serious threat to human health. Therefore, there has been a growing interest in developing alternative lead-free piezoelectric materials that can eventually replace the current lead-based ones. 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. (Bi0.5Na0.5)0.94Ba0.06TiO3 (abbreviated as BNBT) ceramic of near MPB composition was synthesized by two different processes. Modified mixed oxide method is involved with the addition of pre-synthesized BaTiO3 and pre-milled Bi2O3, Na2CO3, BaCO3 powders and calcination powder milled with a high energy milling machine in order to obtain a nano particle size. Conventional mixed oxide method also performed to compare with the former process. The particle size of the powder exposed to heavy high energy milling reduced to 60nm, whereas that of the conventionally ball-milled powder without the pre-milling and the pre-synthesis process had a larger size of ~300nm. To investigate the effects of the modified process on the characteristic of BNBT ceramics, the dielectric and the piezoelectric properties of sintered specimens fabricated by the two different processes were evaluated. It was found that the properties of the nano-sized BNBT ceramic near the MPB composition were increased by the modified mixing and milling method. The modified mixing and milling method was considered to be a new and promising process for lead-free piezoelectric ceramics owing to their excellent piezoelectric/dielectric properties. |
| 저자 | Woong-Jae Lee1, Oun-Yeon Choi2, Young-Ju Ahn3, Gwang-Su Lee4, Neamul Hayet Khansur5, Man-Soon Yoon6, Soon-Chul Ur1 |
| 소속 | 1Dept. of Materials Sci. and Eng., 2Research center for Sustainable Eco-Devices and Materials (ReSEM), 3Chungju National Univ., 4Chungbuk, 5380-702, 6Republic of Korea. |
| 키워드 | Modified Mixed Oxide Method; Nano Sized; BNBT; Piezoelectric |
