Dielectric spectroscopy and ferroelectric studies of multiferroic bismuth ferrite modified barium titanate ceramics for energy storage capacitor applications

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2022-08, Vol.282, p.115791, Article 115791
• Main Authors: Priya Balmuchu, Shashi, Mangalampalli, S.R.N. Kiran, Dobbidi, Pamu
• Format: Article
• Language: English
• Subjects: Barium titanates; Bismuth; Bismuth ferrite; Ceramics; Composition; Dielectric; Energy storage; Ferroelectric; Ferroelectric materials; Ferroelectricity; Impedance spectroscopy; Multiferroic materials; Perovskite structure; Perovskites; Phase transitions; Solid solutions; Temperature dependence; Transition temperature
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2022.115791

•The BTBF1 ceramic showed enhanced dielectric properties with a large dielectric constant (εr = 1555) and low loss tangent (tanδ = 0.08) at 1 MHz.•The impedance studies suggest non-Debye type relaxation and NTCR (negative temperature coefficient of resistance) behavior of the composition.•Complex impedance analysis suggests the only grain effect in the conduction process by fitting the Nyquist plot with the RQC equivalent circuit.•BTBF1 ceramic showed an improved energy density of 39.91 mJ/cm3 and energy efficiency of 60.92%. This study reports a single-phase solid-solution of barium titanate- bismuth ferrite (1-x) BaTiO3-xBiFeO3 (x = 0.0, 0.1, 0.2 and 0.3, abbreviated as BTO, BTBF1, BTBF2 and BTBF3) composition fabricated via conventional solid-state reaction technique. The BFO modified BTO ceramics exhibit a single perovskite structure with pseudo-cubic (x ≥ 0.1) symmetry, and the c/a ratio decreases with an increase in BFO content. Dielectric studies suggest that the ferroelectric-paraelectric phase transition around 150 °C for BTBF1 ceramic increases to 180 °C for BTBF3 ceramic, attributed to the higher transition temperature of BFO ceramic. The temperature-dependent impedance studies suggest non-Debye type relaxation and NTCR (negative temperature coefficient of resistance) behavior of the composition. Among the prepared ceramics, BTBF1 ceramic showed an improved energy density of 39.91 mJ/cm3 and energy efficiency of 60.92%. Thus, prepared ceramics can be considered a potential candidate for energy storage applications.