Experimental investigations of viscoelastic and ferroelectric heating in PZT–5H

Abstract

This contribution focuses on the separation of two effects causing a temperature change in experiments with electrically loaded ferroelectrics. These materials are often subjected to cyclic loading, where viscoelasticity prevails at lower electric fields, whereas dissipative heating by domain switching governs the heating above the coercive field. Different frequencies and load amplitudes are investigated experimentally.

Hybrid modeling of viscoelastic and switching–induced heating in ferroelectrics

“…Generally both viscoelasticity and domain switching lead to dissipative heating in ferroelectrics, the latter effect dominating above the coercive field and typically amounting to 10-15 K [7]. With the presented new hybrid micromechanical-rheological model obviosly it is possible to calculate correctly the temperature from self-heating due to viscoelastic effects, see Fig.…”

“…where qS j is the surface heat flux, ϕ free the free energy density, T the absolute thermodynamic temperature and ẇtot and ẇirr are the total and irreversible parts of the electromechanical power, respectively. Note, while T is the absolute thermodynamic temperature of the material θ = T − T 0 (7) denotes a temperature change. Additionally to the dissipative power, from the first law of thermodynamics results the expression…”

A Multiscale Modeling Approach on Modeling Visco–ferroelectric Self Heating in Ferroelectrics

“…Generally, both viscoelasticity and domain switching lead to dissipative heating in ferroelectrics, the latter effect dominating above the coercive field and typically amounting to 10-15 K [9]. With the presented new hybrid micromechanical-rheological model, obviously it is possible to calculate correctly the temperature from self-heating due to viscoelastic effects, see Fig.…”