| 학회 |
한국재료학회 |
| 학술대회 |
2017년 가을 (11/15 ~ 11/17, 경주 현대호텔) |
| 권호 |
23권 2호 |
| 발표분야 |
8. 나노센서의 핵심기술과 최근 응용 분야(Nanotechnology-based Sensors and The Recent Applications) |
| 제목 |
입자 배향된 무연 압전 세라믹의 강유전 도메인 제어효과 |
| 초록 |
Recently developed lead-free incipient piezoceramics are promising candidates for off-resonance actuator applications with their exceptionally large electromechanical strains. Their commercialization currently faces three critical challenges: high driving electric field required for delivering the potentially available large strains, large strain hysteresis inappropriate for precision devices, and relatively large temperature dependence. Textured Bi0.5(Na0.78K0.22)0.5TiO3-baed ceramics were fabricated by reactive templated grain growth (RTGG) method with the viewpoint of improving the strain response and reducing the driving electric field from grain orientation. Textured BNKT-based ceramcis show high orientation factor (Lotgering’s factor), and exhibited large strain values at relatively lower applied electric field, which corresponds to a normalized strain (Smax/Emax) of ＞1000 pm/V. We found that the crystallographic orientation of textured ceramics could be adjusted depending on the kind of seed particles. The crystallographic orientation of the direction perpendicular to the casting direction for textured BNKT-based ceramics by Na0.5Bi4.5Ti4O15 seed particles are ＜200＞ instead of [002] that is commonly aimed at for tetragonal systems during RTGG process. In this study, we studied the anisotropic electrical properties of the textured BNKT-based ceramics by constraining polarization to the in-plane direction to casted surface. |
| 저자 |
안창원1, 최강호2, 조욱2, 이재신1
|
| 소속 |
1울산대, 2UNIST |
| 키워드 |
<P>Lead-free; piezoelectric; ceramics</P>
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| E-Mail |
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