Abstract
The microstructure of PbZr0.9Ti0.1O3 ceramics is studied by transmission electron microscopy. Two types of domain patterns are found, namely, the 109° domain with the F spots (12{hkl} superlattice reflections) observed in neighboring domains and the 71° domain with the F spots observed in one domain and having disappeared in the neighboring one. The computer simulation indicates that the F spots are forbidden at h=k positions so that they do not appear in the electron diffraction pattern if viewed along the [1̄10] direction. Based on this result, the observed two types of domain patterns and their corresponding diffraction patterns can be explained.
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