Abstract
Aurivillius phase BaBi3.5Eu0.5Ti4O15 (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 I4/mmm and Raman spectrum indicated that Eu3+ ions occupy the A site. It was observed that the average grain size is 0.5–2.5μm by the scanning electron microscope. The photoluminescence spectra showed that the intense emission bands centered at about 593 and 615nm are due to the transitions of 5D0→7F1 and 5D0→7F2 of Eu3+ ions respectively. The temperature of dielectric constant maximum, the room temperature dielectric constant and loss at 1MHz are 373°C, 222 and 0.013, respectively. The activation energy of dielectric relaxation was estimated to be 1.17eV, which could be attributed to the thermal motion of oxygen vacancies. The BBET ceramics had a remnant polarization (2Pr) of 0.75μC/cm2 at room temperature. The results suggest that BBET ceramics can be considered as a promising multifunctional optoelectronic material.
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