Optical transmittance and crystal‐lattice distortion and their relation were studied in hot‐pressed La‐doped Pb zirconate‐titanate (PLZT) ferroelectric ceramics at the ferroelectric‐antiferroelectric morphotropic phase boundary. In the thermally annealed condition, the crystal system of PLZT at the FE‐AFE morphotropic phase boundary was pseudotetragonal and similar to the antiferroelectric phase (AFE β ) appearing in Pb(Zr, Ti)O 3 and (Pb, Sr)ZrO 3 . Optical transmittance and crystal‐lattice distortion change monotonically with respect to the Zr/Ti ratio, and the optical transmittance increases approximately linearly with decreasing lattice distortion. In view of these relations and the temperature dependence of the optical transmittance, it is suggested that light scattering in PLZT ceramics is caused mainly by the variation in refractive index encountered as the light travels from one domain or grain into another.
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Miyauchi et al. (1975) studied this question.
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