Structure, photoluminescence and electrical properties of BaBi3.5Eu0.5Ti4O15 ceramics

Abstract Aurivillius phase BaBi 3.5 Eu 0.5 Ti 4 O 15 (BBET) ceramics were synthesized using a solid state reaction method. X-ray diffraction analysis confirmed that the compound is a four-layer Aurivillius oxide with tetragonal space group I 4/ mmm and Raman spectrum indicated that Eu 3+ ions occupy the A site. It was observed that the average grain size is 0.5–2.5 μm by the scanning electron microscope. The photoluminescence spectra showed that the intense emission bands centered at about 593 and 615 nm are due to the transitions of 5 D 0 → 7 F 1 and 5 D 0 → 7 F 2 of Eu 3+ ions respectively. The temperature of dielectric constant maximum, the room temperature dielectric constant and loss at 1 MHz are 373 °C, 222 and 0.013, respectively. The activation energy of dielectric relaxation was estimated to be 1.17 eV, which could be attributed to the thermal motion of oxygen vacancies. The BBET ceramics had a remnant polarization (2 P r ) of 0.75 μC/cm 2 at room temperature. The results suggest that BBET ceramics can be considered as a promising multifunctional optoelectronic material.