MICROSTRUCTURAL STUDY OF THE LI+ ION SUBSTITUTED PEROVSKITES LI0.5-3XND0.5+XTIO3

摘要

The microstructure of samples of different polymorphs belonging to the cation-deficient Li0.5-3xNd0.5+xTiO3 0.016 < x < 0.12 solid solution has been studied by ED and TEM. The basic cell of all of them is a diagonal perovskite with dimensions similar to root 2(p) similar to root 2a(p) similar to 2a(p). However, important differences between the polymorphs have been found in the microstructure. While in C-phase samples a randomly oriented microdomain structure of the basic cell is found, for the beta polymorph materials a more complex domain microstructure gives rise to a very large superperiodicity (a = 58.6 Angstrom b = 90.7 Angstrom) as is also the case for the alpha' polymorph samples. (C) 1997 Academic Press. [References: 18]