| 학회 | 한국재료학회 |
| 학술대회 | 2021년 봄 (05/12 ~ 05/14, 광주 김대중컨벤션센터) |
| 권호 | 27권 1호 |
| 발표분야 | A. 전자/반도체 재료 분과 |
| 제목 | Stable dielectric properties at high temperature of BaTiO3-(Bi0.5,Na0.5)TiO3 ceramics synthesized by hydrothermal synthesis. |
| 초록 | Recently great interests of hybrid cars or electronic cars lead to unlimited research about pulsed power system. The capacitors which are one of the most important components composing pulsed power system exhibit high energy density and thermal stability in wide range of temperature. Relaxor ferroelectric ceramics are promising materials to satisfying these requirements for pulsed power capacitors. In this study, relaxor ferroelectrics, BaTiO3-(Bi0.5, Na0.5)TiO3 (BT-BNT) system is introduced. The BT which is popular lead-free ferroelectrics has phase transitions at 0OC and 120OC, which causes dramatic change of dielectric permittivity. For addition of BNT its phase transition temperature is shifted to higher or lower temperature, and relaxation behavior was observed that can exhibit stable dielectric properties over a wide temperature range. Several approaches have been developed to overcome the limitations of the traditional solid state reaction process in preparing high-purity, ultra-fine BaTiO3, (Bi0.5, Na0.5)TiO3 powder with good chemical homogeneity at lower temperatures. Among the various preparation methods developed so far, the hydrothermal synthesis has been appeared to be one of suitable methods for the industrial requirements of BaTiO3,(Bi0.5, Na0.5)TiO3 powders. This method has the following advantages. The moderate temperatures required by this technique not only reduce the energy cost but also enhance the reactivity of the products and high-purity and single-phase oxides can be obtained at a relatively fast rate under elevated temperature and water vapor pressure. The micro structure observed by Fe-SEM and crystal structure and phase formation figured out via XRD. The dielectric properties such as high temperature dielectric permittivity, loss measured in the wide frequency range. |
| 저자 | 송태영, 성우준, 김한울, 권도균 |
| 소속 | 한국항공대 |
| 키워드 | BaTiO<SUB>3</SUB>; (Bi<SUB>0.5</SUB>; Na<SUB>0.5</SUB>)TiO<SUB>3</SUB>; Hydrothermal synthesis; High temperature dielectric properties |
