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Article Dans Une Revue Sensor letters Année : 2011

Micro-Macro Correlation in Ferroelectric Materials: Depolarization Mechanism Owing Mechanical Stress

Résumé

Piezoelectric ceramics are commonly used in numerous piezoelectric actuators and sensors. Most ferroelectric materials behave as piezoelectric for low driving levels. The increase of electric field, temperature or stress levels leads to a depoling and results in some degradation of dielectric and piezoelectric performances. It is usually considered that this latter phenomenon is due to the irreversible domain wall motion as well as nucleation and growth of new domains. The domain configuration of ferroelectric materials significantly influences their behaviour under compressive stress, electric field and temperature driving. A fine description of domain organization can help to understand the piezoelectric and dielectric responses. The purpose of this work is to analyse these phenomena throughout a multi-scale approach. Microscopic, X-ray measurements have been performed on several ceramics with different crystallographic symmetries in order to evaluate the percentage of switched domains (PSD). The macroscopic polarization state was simulated from PSD and compared to experimental results. An estimation of depolarization mechanisms under stress is proposed. From these results, it can be concluded that domain switching induced by compressive stress was mainly controlled by the mechanical applied stress. Dipole–dipole interactions appear to be no predominant. In addition, influences of temperature and electric field are analysed.

Domaines

Matériaux
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Dates et versions

hal-04283044 , version 1 (13-11-2023)

Identifiants

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Abdelowahed Hajjaji, Mohamed Rguiti, Yahia Boughaleb, Zina Sassi, Sophie d'Astorg, et al.. Micro-Macro Correlation in Ferroelectric Materials: Depolarization Mechanism Owing Mechanical Stress. Sensor letters, 2011, 9 (6), pp.2190-2193. ⟨10.1166/sl.2011.1792⟩. ⟨hal-04283044⟩
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