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

Phase structures of two ceramics of Compositions BaNd₂Ti₅O₁₄ and Ba_3.75Nd_9.5Ti₁₈O₅₄, 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 Ba_3.75Nd_9.5Ti₁₈O₅₄ is a single-phase composition.