The potential lead-free piezoelectric material sodium bismuth titanate, Na 0.5 Bi 0.5 TiO 3 , was investigated by means of high-resolution single-crystal X-ray diffractometry. The splitting of Bragg peaks observed in the high-resolution reciprocal-space maps suggests that the average structure of Na 0.5 Bi 0.5 TiO 3 has lower than rhombohedral symmetry. This observation is contrary to the commonly adopted model, which has followed from many previous analyses of neutron and X-ray powder diffraction data.
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Gorfman et al. (2010) studied this question.
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