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Abstract
The ferroelectric and antiphase domain structures of Gd2(MoO4)3 have been studied by means of electron microscopy. Anomalous right-angled ferroelectric domain walls in (001) films were observed and the lattice distortions around them were analysed by the use of the moire technique. The existence of antiphase boundaries due to the space group of the ferroelectric phase was proved in the dark-field images produced by the superlattice reflections.