Effects of Synthesized Method on the Properties of Sm-doped BaTiO3

The crystal structures and dielectric properties of Sm-doped BaTiO3 have been studied in terms of synthesized method. (Ba1-xSmx)TiO3 samples were prepared using the liquid mix method and solid state reaction. The lattice constants of (Ba1-xSmx)TiO3 system by the liquid-mix method steadily decreased with increasing Sm content. Curie temperature (T-c) moved to lower temperatures as the Sm content increased. In (Ba1-xSmx)TiO3 system by the solid state reaction, the crystal structure of (Ba1-xSmx)TiO3 switches to pseudo-cubic and the lattice constant increased with increasing Sm contents. The conventional mixing of starting powders and repeated calcinations processes did not yield the expected nominal composition, where Sm ions occupy mostly Ti sites even in the Ba deficient composition(Ba/Ti<1). The shift in To in this system is considerably larger than in the corresponding composition by the liquid mix method. The specimens doped with Sm<5 mol% had a substantially small grain size and with Sm>5 mol% a larger grain growth was developed.