Abstract
SrxBi6-xFe1-x/2Co1-x/2Ti3+xO18 (x = 0, 0.25, 0.5, 0.75, 1)(SBFCT-x) ceramics were prepared by the sol-gel auto-combustion method, and their microstructures, ferroelectric, magnetic and dielectric properties were investigated. All samples show layer-perovskited Aurivillius phase, which confirms that Sr doping does not affect the structure of SBFCT ceramics. The coexistence of ferroelectricity and ferromagnetism were observed at room temperature for all the samples. The largest remnant polarization (2Pr ˜ 17.4 μC/cm2) is observed in the SBFCT-1 ceramic, while the SBFCT-0.5 ceramic shows the highest remnant magnetization (2Mr ˜ 0.74 emu/g). To explore the effect of valance states of magnetic ions on the properties, we analysed the content variation of Fe2+, Co2+, and oxygen vacancies by the X-ray photoelectron spectroscopy results. Furthermore, dielectric anomalies have been found around 400 K, which can be ascribed to the hopping process of oxygen vacancies. The effects of Sr and Ti substitution on ferroelectric and magnetic properties have been investigated and discussed.
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