Description
Ferroelectrics are used to generate a displacement or force by applying an electric voltage. The underlying so-called piezoelectric effect is a coupling between electric field and strain. Being a polycrystalline material, piezoelectric properties have to be induced by the so-called poling process. This process may lead to a remanent polarization field which is not divergence free, in general. As a consequence, severe electric depolarization fields may occur. On the other hand, it is well known that ferroelelctrics possess a so-called weak electric conductivity, i.e., they are no perfect insulators. In lead-free ferroelectrics, this effect is even more pronounced than classical lead-based actuator soft-PZT materials.
Recommended Citation
Schwaab, H., & Kamlah, M. (2014). Modeling poling processes in ferroelectric devices taking into account weak electric conductivity. In A. Bajaj, P. Zavattieri, M. Koslowski, & T. Siegmund (Eds.). Proceedings of the Society of Engineering Science 51st Annual Technical Meeting, October 1-3, 2014 , West Lafayette: Purdue University Libraries Scholarly Publishing Services, 2014. https://docs.lib.purdue.edu/ses2014/honors/prager/6
Modeling poling processes in ferroelectric devices taking into account weak electric conductivity
Ferroelectrics are used to generate a displacement or force by applying an electric voltage. The underlying so-called piezoelectric effect is a coupling between electric field and strain. Being a polycrystalline material, piezoelectric properties have to be induced by the so-called poling process. This process may lead to a remanent polarization field which is not divergence free, in general. As a consequence, severe electric depolarization fields may occur. On the other hand, it is well known that ferroelelctrics possess a so-called weak electric conductivity, i.e., they are no perfect insulators. In lead-free ferroelectrics, this effect is even more pronounced than classical lead-based actuator soft-PZT materials.