Abstract
The microstructure of domains and boundaries in a bulk orthorhombic La2/3Ca1/3MnO3 material is analysed by applying symmetry group theory. Group theory predicts that the 120degrees and 90degrees orientation domains occur in bulk La1-xCaxMnO3 (LCMO) when the cubic LCMO transforms into the orthorhombic LCMO by means of a structural phase transition. The orientation domains are observed and characterized by means of electron diffraction and high-resolution electron microscopy. Antiphase boundaries due to the loss of translation operations have displacement vectors of 1/2[010](O), 1/2[101](O) and 1/2[111](O), according to the group theory. Diffraction contrast technique reveals that the displacive vector of most antiphase boundaries is 1/2[111](O), which is also confirmed by means of high-resolution electron microscopy.
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