Abstract
Various types of boundary in orthorhombic calcium zirconate (CaZrO3) were examined using conventional transmission electron microscopy (CTEM), high-resolution electron microscopy (HREM), selected-area diffraction (SAED) and convergent-beam electron diffraction (CBED). Two types of interface, namelyδ-boundaries and coherent twin boundaries were identified and analysed. Theδ-boundaries were studied using CTEM, SAED and CBED; the twin boundaries were investigated using the additional technique of HREM. Pseudosymmetric twinning was observed in CaZrO3 where the two domains were related to each other by either a 180° or a 90° rotation about an axis perpendicular to (101). A different type of twin boundary, where the adjacent domains were related by a 180° rotation about the normal to (100), was also noted. The observations are compared with previous studies on other ABO3-type compounds isostructural with CaZrO3.
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