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Raman, infrared, EPR and dielectric investigations on ferroelectric (Pb1−3x/2/Lax)TiO3:0.003 Mn ceramics show that the perturbed sublattice of Pb2+ acts as a homogeneous medium. The description of the overall behaviour by means of the virtual crystal approximation is suggested.
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Windsch et al. (1990) studied this question.
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