| 학회 | 한국재료학회 |
| 학술대회 | 2018년 봄 (05/16 ~ 05/18, 삼척 쏠비치 호텔&리조트) |
| 권호 | 24권 1호 |
| 발표분야 | 2. 유전체/압전체의 도전과 미래(Challenges and Future for Dielectrics and Piezoelectrics)-오거나이저: 이순일 교수(창원대) |
| 제목 | BiFeO3-BaTiO3계 친환경 압전재료 |
| 초록 | Piezoelectric materials convert electrical energy into mechanical energy and vice versa, and are applied to actuators and sensors. Lead-free piezoelectric materials have been studied to replace the commonly used lead zirconate titanate (PZT) because of environmental and health issues. A new system of environment-friendly lead-free piezoelectric (1-x)BiFeO3-xBaTiO3 is a strong candidate to replace PZT. Piezoelectric (1-x)BiFeO3-xBaTiO3 (BFBT100x) solid solution ceramics were prepared by using conventional solid state reaction process with thermal quenching process. High performances of piezoelectric properties and high Curie temperatures were observed due to the reduced secondary phases and improved leakage current properties of BFBT100x ceramics. Best direct sensor piezoelectric coefficient was observed in BFBT33 ceramics where mixed phases were observed. And best converse actuator piezoelectric coefficient was observed in BFBT40 ceramics where softer ferroelectric properties were observed than in BFBT33 ceramics. The physical origin of these improved results will be discussed.[1] BFBT100x thin films were deposited by using pulsed laser deposition method. Polycrystalline thin films were prepared on platinized silicon substrates and best piezoelectric properties were observed in BFBT40 thin films by using piezoelectric force microscopy. The results were as good as those of lead-based thin films.[2] Epitaxial BFBT100x thin films were also prepared on LaAlO3(100) [LAO(100)] substrates and were compared with the results of polycrystalline thin films. Various epitaxial BFBT40 thin films with different crystal orientations were prepared on LAO(100), LAO(110) and LAO(111) substrates. Their ferroelectric, piezoelectric and magnetic properties were observed. The relations between each property and crystal direction will be discussed. [1] M.H. Lee et al., High‐Performance Lead‐Free Piezoceramics with High Curie Temperatures, Advanced Materials 27, 6976-6982 (2015). [2] J. Park et al., High piezoelectric performance of lead-free BiFeO3-BaTiO3 thin films grown by a pulsed laser deposition method, RSC Advances 6, 106899-106903 (2016). |
| 저자 | 송태권 |
| 소속 | 창원대 |
| 키워드 | <P>압전재료; 친환경; 강유전재료</P> |
