Model the nonlinear behavior of the PZT depending of the electric field and the thermal condition
Lead Zirconate Titanate (PZT) is one of the more efficient piezoelectric material used in several practical applications such as ultrasonic transducers and piezoelectric resonators. PZT exhibits greater sensitivity and has a higher operating temperature compared to other piezo materials. Due to its physical strength, chemical inertness, tailorability, and relatively low manufacture costs, it is one of the most used piezo ceramics in the industry. Being piezoelectric, PZT develops a voltage across two of its faces when compressed (useful for sensor applications) and deforms the structure when an external electric field is applied (useful for actuator applications). However, PZT is also ferroelectric which means that its spontaneous electric polarization can be reversed in the presence of a high electric field. The polarization curve is showing some hysteresis. Moreover, PZT is also showing some pyroelectric behavior and can create a voltage difference under changing temperature conditions.
Imec is developing new type of piezoelectric actuators based on PZT piezo material subject to high voltage and high temperature. The goal of this postdoc will be to model carefully the nonlinear behavior of the PZT depending of the electric field and the thermal condition. Finite Element Method will be used to capture the full nonlinear problem. This model will be validated with experimental measurements on representative test structures. Finally, a reduced model will be proposed including the nonlinearities for fast simulations for a specific application. The postdoctoral researcher will be in contact with different teams at imec, including the process team.
Type of work: 15% literature study, 70% modeling, 15% characterization
Supervisor: Ingrid De Wolf
We offer you the opportunity to join one of the world’s premier research centers in nanotechnology at its headquarters in Leuven, Belgium. With your talent, passion and expertise, you’ll become part of a team that makes the impossible possible. Together, we shape the technology that will determine the society of tomorrow. We are proud of our open, multicultural, and informal working environment with ample possibilities to take initiative and show responsibility. We commit to supporting and guiding you in this process, not only with words but also with tangible actions. Through imec.academy, 'our corporate university', we actively invest in your development to further your technical and personal growth. We are aware that your valuable contribution makes imec a top player in its field. Your energy and commitment are therefore appreciated by means of a competitive salary with many fringe benefits.
This postdoctoral position is funded by imec through KU Leuven. Because of the specific financing statute which targets international mobility for postdocs, only candidates who did not stay or work/study in Belgium for more than 24 months in the past 3 years can be considered for the position (short stays such as holiday, participation in conferences, etc. are not taken into account).Continue reading
|Title||Postdoctoral Researcher Modeling of nonlinear behavior of PZT micro-actuator|
|Job location||Kapeldreef 75, B-3001 Heverlee|
|Published||March 31, 2020|
|Job types||Postdoc  |
|Fields||Materials Engineering,   Thermodynamics,   Materials Physics,   Electrical Engineering,   Mechanical Engineering,   Computational Engineering,   Electronics  |