Dielectric Properties of BaBi4Ti4O15 Ceramics Produced by Cost-Effective Chemical Method

Abstract

BaBi4Ti4O15, an Aurivillius compound,was synthesized by a cost-effective soft chemical route.The precursor was prepared by precipitating Bi-and Ba-oxalatesinsideaTiO2 powder suspension.A phase pure orthorhombic BaBi4Ti4O15 was synthesized by heating the precursor powder at1000 1C. The phaseformation behavior was investigated using TG-DSC and XRD.Densification behavior of the powder andmicrostructure development in sintered pellet was examined.Temperature dependent dielectric studyof the ceramic has been investigated in the temperature range300–780K and frequency range of1kHz–1MHz.The broad dielectric constant peaks at temperature Tm was frequency dependent.Thedielectric relaxation rate follows the Vogel–Fulcher relation with activation energy ¼ 0.2639 eV,relaxation frequency ¼ 4.951021 Hz, and freezing temperature ¼ 620 K. All these parameters indicate that BaBi4Ti4O15 is a relaxor ferroelectric.