Zhang, Mao-Hua ; Fulanovic, Lovro ; Egert, Sonja ; Ding, Hui ; Groszewicz, Pedro B. ; Kleebe, Hans-Joachim ; Molina-Luna, Leopoldo ; Koruza, Jurij (2020)
Electric-field-induced antiferroelectric to ferroelectric phase transition in polycrystalline NaNbO 3.
In: Acta Materialia, 200
doi: 10.1016/j.actamat.2020.09.002
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Electric-field-induced phase transitions are the most important characteristics of antiferroelectric mate- rials. However, in several prototype antiferroelectrics, these transitions are irreversible and the origin of this behavior is poorly understood. This prevents their widespread use, for example, in energy storage and memory applications. Here, we investigated the antiferroelectric-ferroelectric phase transitions in poly- crystalline NaNbO 3 , a material recently suggested as the basis for lead-free antiferroelectrics with high energy storage densities. An irreversible transition from the antiferroelectric state to a new state show- ing macroscopic piezoelectricity ( d 33 = 35 pC/N) was induced at 11.6 kV/mm (room temperature, 1 Hz), accompanied by a 33% drop in permittivity. Microscopically, a change from a translational antiferroelec- tric domain structure to a wedge-shaped ferroelectric domain structure was observed using transmis- sion electron microscopy. 23 Na solid-state nuclear magnetic resonance allowed for a detailed study of the local structure and revealed pure antiferroelectric and coexisting antiferroelectric/ferroelectric nature of the samples before and after the application of an electric field, respectively. Interestingly, despite the large electric fields applied, only 50 ±5% of the material underwent the antiferroelectric-ferroelectric phase transition, which was related to the material ´s microstructure. The temperature- and frequency- dependence of the phase transition was studied and compared to the behavior observed in lead-based antiferroelectric systems.

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