Observation of dislocations and inclusions in neodymiumdoped yttrium aluminium garnet by transmission electron microscopy

Abstract

Abstract Dislocations and inclusions in neodymium-doped yttrium aluminium garnet were observed by transmission electron microscopy. Network dislocations on {111} planes are parallel to 〈110〉 directions and appear to be undissociated. Electron diffraction patterns from the inclusions show them to be single crystals of the orthorhombic yttrium aluminate perovskite-type. Electron microprobe analysis of similar inclusions indicates that they are crystals of yttrium neodymium aluminate, Y1-xNdxAlo3 (x  0.4). An orientation relationship between the inclusions and the garnet matrix is suggested.