Matrix Phase in Ceramics with Composition near BaO·Nd2O3·5TiO2

Phase structures of two ceramics of Compositions BaNd2Ti5O14 and Ba3.75Nd9.5Ti18O54, both of which had earlier been reported to be single-phase materials, were investigated using electron microscopy and an electron probe microanalyzer. It was observed that the amount of secondary phases was much lower in ceramics prepared with the latter composition and that the composition of the matrix phase of both samples was near 4BaO·5 Nd2O3·18TiO2. These results indicate that only the composition Ba3.75Nd9.5Ti18O54 is a single-phase composition.