| Project/Area Number |
25400323
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Condensed matter physics I
|
|---|
| Research Institution | Nagoya Institute of Technology |
|---|
Principal Investigator |
Iwata Makoto 名古屋工業大学, 工学(系)研究科(研究院), 教授 (40262886)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
MAEDA MASAKI 名古屋工業大学, 大学院工学研究科, 教授 (10091745)
|
|---|
| Research Collaborator |
ISHIBASHI YOSHIHIRO 名古屋大学, 名誉教授
ANDO KENICHIROU 名古屋工業大学, 大学院工学研究科, 大学院生
YOKOI RYUTA 名古屋工業大学, 大学院工学研究科, 大学院生
SUGIYAMA YUTA 名古屋工業大学, 大学院工学研究科, 大学院生
NAGAHASHI RYO 名古屋工業大学, 大学院工学研究科, 大学院生
|
|---|
| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Project Status |
Completed (Fiscal Year 2015)
|
| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
|
|---|
| Keywords | 強誘電体 / 電場誘起相転移 / 構造相転移 / モルフォトロピック相境界 / 電場相図 / 臨界点 / ペロブスカイト / 誘電率 |
|---|
| Outline of Final Research Achievements |
The purpose of our study is to clarify responses of the polarization under the electric field near the morphotropic phase boundary in the perovskite-type ferroelectric Pb(Zn1/3Nb2/3)O3-PbTiO3 (PZN-PT) mixed crystal system. In the present study, we experimentally clarified the temperature-concentration-field phase diagram in PZN-PT. It was found that on the phase diagram, the critical endpoint exists under the electric field along the [001]-direction, and the stable orthorhombic phase exists under zero field. The Curie-Weiss constant in PZN-8%PT can be determined by using our results of the dielectric constant in the high temperature range and T0 obtained from the temperature-field phase diagram. Furthermore, it was clarified that the reason why the third-order dielectric susceptibility takes positive value in the paraelectric phase is that the phase transition under zero field is of the first-order.
|
