2013 Fiscal Year Final Research Report
Ferroelectric Domain Controlled Piezoelectric Ceramics and Their Devices for Environmental Friendly Materials
| Project/Area Number |
21560340
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Electronic materials/Electric materials
|
|---|
| Research Institution | Shizuoka Institute of Science and Technology |
|---|
Principal Investigator |
OGAWA Toshio 静岡理工科大学, 理工学部, 教授 (40247573)
|
|---|
| Project Period (FY) |
2009-04-01 – 2014-03-31
|
| Keywords | 圧電セラミックス / 超音波速度 / ヤング率 / ポアソン比 / 高周波超音波厚さ計 / 非鉛系圧電材料 / 鉛系圧電材料 / DC分極 |
|---|
| Research Abstract |
Material research and development on piezoelectric ceramics was proposed from viewpoints of relationships between piezoelectricity and elastic constants such as Young's modulus and Poisson's ratio. We developed a method to be convenient to measure acoustic wave velocities by an ultrasonic thickness gauge with high-frequency. From the relationships between kp (planar coupling factor of disk) vs longitudinal and transverse wave velocities, Young's modulus and Poisson's ratio, the kp lineally increased with decreasing Young's modulus and with increasing Poisson's ratio. It was clarified that higher kp values can be realized in lower Young's modulus, higher Poisson's ratio and lower bulk density for lead-free ceramics. Furthermore, the candidates of lead-free ceramic compositions with higher piezoelectricity were proposed. The measurement of sound velocities was an effective method for researching and developing piezoelectric materials.
|
