Three new publications from Electrosciences

Electrosciences has co-authored three new scientific peer reviewed papers with a focus on the ferroelectric behaviour of industrially important piezoelectrics: 1) theory and experiment at very low temperatures, 2) how to determine unpoled elastic properties and 3) fatigue effects at low electric fields. Details and links are found here:

We provide an insight into the switching of near-morphotropic composition of PZT, using molecular dynamics simulations and electrical measurements. The simulations and experiments exhibit qualitatively similar hysteretic behavior of the polarization for different temperatures showing widening of the P-E loops and the decrease in the coercive field toward high temperatures. Remarkably, we have shown that polarization switching at low temperatures occurs via polarization rotation, that is a fundamentally different mechanism from high-temperature switching, which is nucleation driven. 1) J. B. J. Chapman, O. T. Gindele, C. Vecchini, P. Thompson, M. Stewart, M. G. Cain, D. M. Duffy, and A. V. Kimmel, “Low temperature ferroelectric behavior in morphotropic Pb (Zr 1− xTi x)O 3,” Journal of the American Ceramic Society, vol. 5, pp. 1–9, Sep. 2017.
Schematic of unpoled PZT multilayer actuator

A new method to determine the un-poled elastic properties of ferroelectric materials.

2) C. R. Bowen, A. C. Dent, R. Stevens, M. G. Cain, and A. Avent, “A new method to determine the un-poled elastic properties of ferroelectric materials,” Sci. Technol. Adv. Mater., pp. 1–0, Mar. 2017.
Fatigue in PZT - circuitSchematic diagram of the circuit used to study switching behaviour of ferroelectric bulk samples. A high speed MOSFET was used to switch between a high voltage and ground. Measurement of the voltage across a reference resistor (50 Ω) allows monitoring of the transient current. The load resistance was 300 Ω. 3) T. Buchacher, S. Lepadatu, J. Allam, R. Dorey, and M. G. Cain, “Low field depoling phenomena in soft lead zirconate titanate ferroelectrics,” J Electroceram, pp. 1–7, Dec. 2016.