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Erschienen in:
01.08.2014 | Original Paper
Synthesis and dielectric properties of the Aurivillius oxide BaBi4Ti4O15 by the Pechini method
Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 2/2014
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Abstract
Barium bismuth titanate (BaBi4Ti4O15, BBT) powders were synthesized using the Pechini method, and related ceramics were prepared using a solid-state reaction method. The structure and morphology of the BBT specimens were examined by the X-ray diffraction and scanning electron microscopy. Complexation of citric acid with metallic cations was detected by Fourier-transform infrared spectroscopy. Thermal analyses of the obtained gels were performed using differential thermal gravimetry. Pure BBT powders could be obtained at a relatively low temperature of 500 °C. A broad dielectric peak around Curie temperature and significant frequency diffusion of the maximum dielectric permittivity were observed. The diffuseness parameter was 1.82, and relaxation was attributed to cationic disordering at the A-site of BBT.