Abstract
Solid solutions (1 − x)NBT– xBF, between rhombohedral compounds Na 0.5Bi 0.5TiO 3 (NBT) and BiFeO 3 (BF) were studied and a continuous R3 c solid solution was evidenced. Lattice parameters and rhombohedral distortion evolution with BF content were studied. The “ a” pseudo-cubic parameter ( a p) increases linearly with BF rate, as the “ α” pseudo-cubic one ( α p) presents a more complex behaviour. The study of the dielectric properties evidenced two different ranges, with a limit composition around 50% of BF. TEM studies of the reciprocal space showed that the relaxor behaviour of NBT-rich samples is correlated both with superstructure spots and diffusion rows along some particular directions.
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