Abstract
Some tungsten–bronze ferroelectrics were synthesized and characterized in the BaO-Sm 2O 3-TiO 2-Nb 2O 5 system. Ba 4Sm 2Ti 4Nb 6O 30 and Ba 5SmTi 3Nb 7O 30 had the tetragonal filled tungsten–bronze structure; while Ba 3Sm 3Ti 5Nb 5O 30 consisted of the orthorhombic tungsten–bronze major phase and the BaTi 4O 9 secondary phase. The present dielectric ceramics exhibited relaxor behavior with the maximum temperatures around 185, 285 and 130 °C for Ba 3Sm 3Ti 5Nb 5O 30, Ba 4Sm 2Ti 4Nb 6O 30 and Ba 5SmTi 3Nb 7O 30, respectively. Moreover, Ba 3Sm 3Ti 5Nb 5O 30 exhibited a second possible phase transition around 93 °C.
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