A niobate was synthesized by doping Bi3＋ in the ternary system BaO Na2O Nb2O5. The crystal structure was determined by X ray powder diffraction,and it belongs to tetragonal tungsten bronze structure at room temperature with unit cell parameters a=1.24777 (2) nm,c=0.39266(1) nm,α =β =γ =90° .Measurements of dielectric properties indicate that phase transitions of Ba3NaBiNb10O30 from paraelectric to ferroelectric occurs at 400℃ ,which is lower than that of Ba2NaNb5O30.
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