Getting the lead out: The bonding preferences of three octahedral-site cations permit the accommodation of the small, low-symmetry Bi3+ cation on the twelve-coordinate A site of the perovskite structure, affording a lead-free ferroelectric material (see picture). The graph shows the temperature dependence of the relative permittivity (○, left axis) and the dielectric loss (▴, right axis).
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Bridges et al. (2007) studied this question.
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