| 학회 |
한국재료학회 |
| 학술대회 |
2021년 봄 (05/12 ~ 05/14, 광주 김대중컨벤션센터) |
| 권호 |
27권 1호 |
| 발표분야 |
A. 전자/반도체 재료 분과 |
| 제목 |
Effects of SrTiO3 modification on piezoelectric and strain properties of lead‒free K0.5Na0.5NbO3‒based ceramics |
| 초록 |
Lead−free (1−x)K0.5Na0.5NbO3–xSrTiO3 (KNN–100xST) solid solution ceramics were prepared using conventional solid–state reaction method to investigate their phase transition behavior and electrical properties. It is known that SrTiO3 modification in lead−free KNN ceramics is able to improve piezoelectric properties as well as sinterability of KNN ceramics. The previous studies for SrTiO3−modified KNN ceramics have mainly focused on the enhancement of dielectric and piezoelectric properties using orthorhombictetragonal (O−T) phase transition concept. However, none of them clarified for the electromechanical strain behaviors near O−T phase boundary. In this work, the polymorphic phase boundary between the orthorhombic and the tetragonal phases can be found at 5 mol% of SrTiO3 content, where enhanced piezoelectric constant (d33) was observed. Besides, the normalized strain (d*33) was obtained from the unipolar strain at 4 kV/mm, which reached 210 pm/V as the highest values in KNN−5ST ceramics. |
| 저자 |
Trang An Duong, Hoang Thien Khoi Nguyen, Sang Sub Lee, Donghyeok Kim, Chang Won Ahn, Hyoung‒Su Han, Jae‒Shin Lee
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| 소속 |
Univ. of Ulsan |
| 키워드 |
lead−free; SrTiO<SUB>3</SUB>; tetragonal; strain
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| E-Mail |
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