Abstract
Abstract The temperature dependence of the crystal structures of tin-modified lead zirconate titanate ceramics Pb(0.98)Nb0.02[Zr1−x,Snx)1−yTiy]1−zO3 was investigated by hot-stage transmission electron microscopy. The composition chosen for study, x=0.42 and y=0.04 (i.e., PZST 42/4/2), had a sequence of phase transformations on heating of antiferroelectric - multicell cubic - simple cubic. The presence of the multicell cubic phase was characterized by the existence of weak ½[110] superlattice spots in the temperature range between the antiferroelectric and simple cubic phases. The antiferroelectric phase in both compositions was characterized by the presence of one-dimensional regular arrays of antiphase domain boundaries and 1/x[110] superlattice spots. The modulation wavelength for the superlattice spot was found to be a strong function of temperature and was incommensurate with the lattice.
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