Efeito do dopante Ba sobre as propriedades estruturais e microestruturais de ceramicas Bi0.5Na0.5TiO3
Document typeConference report
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Recently, Bi0,5Na0,5TiO3 (BNT) based ceramics has been widely studied as one promising material lead-free for piezoelectric applications. The Ba addition in BNT ((Bi0,5Na0,5)1-xBaxTiO3 - BNT-xBT) has attracted considerable attention due to the existence of a rhombohedral-tetragonal morphotropic phase boundary (MPB) near x = 0.06, where it shows maximized piezoelectric properties. In this study, BNT-XBT ceramics near the MPB (0.05 = x = 0.07), were prepared by solid-state reaction method. The effect of Ba doping on structure and microstructure of the BNT-xBT ceramics was investigated. The X-ray diffraction results show MPB for 0.06 = x <0.07. Raman spectroscopy suggests tetragonal symmetry, wich presence of the band at 300 cm-1 for composition x = 0.07, confirming the presence of the MPB region below this composition. Scanning electron microscopy images indicate apparent decrease of the grain size with increasing Ba concentration.
CitationBosco, V., Cerdeiras, E., Mestres, L., Machado, R., Ochoa, D. A., Garcia, J. E. Efeito do dopante Ba sobre as propriedades estruturais e microestruturais de ceramicas Bi0.5Na0.5TiO3. A: Congreso Brasileiro de Cerâmica. "59º Congreso Brasileiro de Cerâmica - Proceeding Book". Aracajú: 2015, p. 1868-1875.
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