Abstract
In this work, the effects of barium substitution on the local structure, dielectric and magnetic properties of the polycrystalline ceramics 0.6BiFeO3–0.4(Bi0.5K0.5)TiO3 (0.6BFO–0.4BKT) system was investigated. A solid-state reaction technique was used to synthesize the materials with barium (Ba) doping of 1, 3, 5, 7, and 10 mol%. XRD analysis reveals the coexistence between tetragonal and rhombohedral phases of single-phase perovskite in pure 0.6BFO–0.4BKT and the rhombohedral reach phase was found with increasing Ba content. XANES simulations indicate that the majority of Ba atoms occupy A-site in BKT lattice of Ba-doped 0.6BFO-0.4BKT, the oxidation state of Fe, Ti, and Ba ions are +3, +4 and+2, respectively. At 5 mol% of Ba doping content, the dielectric measurement shows the morphotropic phase boundary (MPB) and the maximum value of ferromagnetic characteristic were observed, indicating an optimum composition, properties and production conditions.
Highlights
Bismuth ferrite (BiFeO3) is considered one of the most promising multiferroic materials for realizing the full potential of multiferroic devices
The data shows that rhombohedral (BiFeO3; JCPDS file no. 74- 2016) and tetragonal (Bi0.5K0.5TiO3; JCPDS file no. 36-0339) phases coexist in the undoped of 0.6BFO–0.4BKT perovskite structure, which slightly shown a minor phase of Bi4Ti3O12
To further quantify the effects of Ba on the structure of 0.6BFO-0.4BKT, the x-ray absorption near edge spectroscopy (XANES) of Fe K-edge, Ti K-edge, and Ba L3-edge spectra are measured and discussed in order to establish the valence of Fe, Ti, and Ba, respectively
Summary
Bismuth ferrite (BiFeO3) is considered one of the most promising multiferroic materials for realizing the full potential of multiferroic devices. The 0.6BFO–0.4BKT ceramics prepared by the conventional solid-state reaction show no obvious ferroelectric switching and its Pr and d33 were very small (~10 C/cm and ~40 pC/N, respectively) even under high electric field amplitudes (Matsuo et al, 2010; Kim et al, 2010). This suggests that the ferroelectric and piezoelectric properties of the 0.6BFO–0.4BKT ceramics are highly dependent on the processing method. Local structure, dielectric and magnetic properties of Ba-doped BFO-BKT Ceramics are investigated with X-ray Absorption Near Edge Spectroscopy, the influence of B-doping and optimum composition is established with an integrated experimental and computational study
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