| 학회 |
한국재료학회 |
| 학술대회 |
2007년 가을 (11/02 ~ 11/02, 성균관대학교) |
| 권호 |
13권 2호 |
| 발표분야 |
전자재료 |
| 제목 |
Domain formations in heteroepitaxial lead titanate films fabricated by hydrothermal epitaxy below Curie temperature |
| 초록 |
The +c-mono domain and a-domain formation in heteroepitaxial PbTiO3 films fabricated by hydrothermal method at 200℃ below Curie temperature (=490℃) were observed. At the early stage of the growth (≤ 1h synthesis time), the islands with only the +c- mono domain with flat surface were formed. However, after this time, the islands were coalesced each other, and finally turned into the continuous film with thickness of ∼500nm. This continuous film had a small volume fraction of a-domains within the +c- mono domain matrix. It also had many small pyramids at the surface. The formation of the +c- mono domain shows that the positive polarization charges were strongly screened by the negatively charged surface layer at the film surface. It seems that the a-domains were formed as a result of the twinning of the tetragonal film that relaxes the strain energy due to both the thermal expansion coefficient, and lattice mismatch between the film and the substrate during cooling from 200℃. With finite element method (FEM) simulation, we will discuss the origin of the +c-mono domain formation and the mechanism of a-domain formation. |
| 저자 |
안세형1, 최시경2
|
| 소속 |
1Department of Materials Science and Engineering, 2Korea Advanced Institute of Science and Technology |
| 키워드 |
ferroelectric domain formation; hydrothermal epitaxy
|
| E-Mail |
|
