Subcoercive-field dielectric response of 0.5 (Ba 0.7 Ca 0.3 TiO 3 ) -0.5 (BaZr 0.2 Ti 0.8 O 3 ) thin film: peculiar third harmonic signature of phase transitions and residual ferroelectricity - Archive ouverte HAL Access content directly
Preprints, Working Papers, ... (Preprint) Year : 2023

Subcoercive-field dielectric response of 0.5 (Ba 0.7 Ca 0.3 TiO 3 ) -0.5 (BaZr 0.2 Ti 0.8 O 3 ) thin film: peculiar third harmonic signature of phase transitions and residual ferroelectricity

Abstract

Sub-coercive field non-linearities in 0.5 (Ba 0.7 Ca 0.3 TiO 3)-0.5 (BaZr 0.2 Ti 0.8 O 3) (BCTZ 50/50) thin film elaborated using pulsed laser deposition are studied using permittivity and phase angle of the third harmonic measurements as function of the AC measuring field E AC and temperature. The global phase transition temperature T max for which the permittivity is maximum, decreases from 330 K to 260 K when E AC increases. Rayleigh analysis of the AC field dependence of the relative permittivity shows a regular decrease of the domain wall motion contributions as temperature increases up to T max and an even more pronounced decrease above T max. This measurement reveals that the ferroelectric behavior subsists 70 K above the global phase transition. The phase angle of the third harmonic at temperatures below 275 K, is characteristic of a conventional ferroelectric and from 275 K to T max = 330 K of a relaxor. Above T max , the thin film exhibits a peculiar phase angle of the third harmonic, which consists of −180 ° → −270 °→ 0° instead of the −180° → −90° → 0° found for relaxor.
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hal-04259437 , version 1 (26-10-2023)

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Attribution - NonCommercial - NoDerivatives

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Kevin Nadaud, Guillaume F. Nataf, Nazir Jaber, Micka Bah, Béatrice Negulescu, et al.. Subcoercive-field dielectric response of 0.5 (Ba 0.7 Ca 0.3 TiO 3 ) -0.5 (BaZr 0.2 Ti 0.8 O 3 ) thin film: peculiar third harmonic signature of phase transitions and residual ferroelectricity. 2023. ⟨hal-04259437⟩
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