Local antiferroelectric order of lattice distortion caused by an ionic size difference has been discovered in relaxor lead scandium niobate, Pb(Sc1/2Nb1/2)O₃, using an x-ray diffuse scattering technique. This ordering nature is thought to produce a glassy motion of ions in response to an applied electric field.
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Takesue et al. (1999) studied this question.
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