Abstract
In this work, a novel three-layer Aurivillius phase Sr1.25Bi2.75Nb1.25Ti1.75O12 was synthesized using the molten salt method, and the crystal structure, morphology, electrical, optical, and energy storage properties were systematically investigated. XRD data supported by the Le Bail refinement technique shows that the product adopts a B2cb orthorhombic crystal structure. FTIR analysis indicates that the Nb5+/Ti4+ ions occupy the perovskite B-site and suggests that the two local environments on the B-site as Ti–O–Ti and Nb–O–Nb linkages. Ferroelectric ordering takes place below the ferroelectric Curie temperature, Tc of 100 °C, which is also revealed by the open ferroelectric hysteresis loops. The characteristic of relaxor-ferroelectric behavior is characterized by the broadened phase transition peaks and the frequency-dispersive behavior. The energy storage density of 12.69 mJ/cm3 with an energy efficiency (η) of 42.1% was obtained in the ceramic sample at applied electric field of 75 kV/cm and room temperature. These findings will provide an important contribution to further research to explore new Aurivillius compounds as potential energy storage materials.
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