The microstructures of domains and boundaries in bulk orthorhombic La2/3Ca1/3MnO3 were analyzed by using symmetry-group theory. This predicted that the 120° and 90° orientation domains occurred in bulk La1-xCaxMnO3 when the cubic material transformed into orthorhombic material via a structural phase transition. The orientation domains were characterized by means of electron diffraction and high-resolution electron microscopy. The antiphase boundaries which were due to the loss of translation operations had displacement vectors of ½[010]O, ½[101]O and ½[111]O, according to group theory. Diffraction contrast techniques revealed that the displacive vector of most antiphase boundaries was ½[111]O. This was confirmed by means of high-resolution electron microscopy.

Transmission Electron Microscopy Investigation of Domains and Boundaries in Bulk La2/3Ca1/3MnO3. D.D.Liang, C.H.Lei, Q.Y.Xu, Y.Ding: Philosophical Magazine, 2003, 83[25], 2915-27