Synthesis and dielectric properties of New Niobate Ba₅BiTi₃Nb₇O₃₀

Abstract

A new niobate Ba₅BiTi₃Nb₇O₃₀ was synthesized by the solid-state reaction. It was characterized by X-ray diffraction and dielectric constant measurements. The results show that Ba₅BiTi₃Nb₇O₃₀ is paraelectric at room temperature and belongs to tetragonal 4/mmm symmetry with unit cell parameters a=1.25020 nm, c=0.39704 nm. Ba₅BiTi₃Nb₇O₃₀ has only one phase transition, paraelectric to ferroelectric, below 0°C.

Keywords

niobate / structural analyses / dielectric properties

References

[1] Han Z Z, Sun D L, Yang Z H, . New Tungsten Bronze Crystal SCNN. J. Chin. Ceram. Soc., 1993, 21: 376-376.

[2] Neurgaonkar R R, Cory W K. Progress in Photorefractive Tungsten bronze Crystals. J. Opt. Soc. Am., 1986, 3(B): 276-276.

[3] Lundberg Monica, Sundberg Margarete. Studies of Phases in the KNbO₃−Nb₂O₅ System by High-Resolution Electron Microscopy and X-Ray Powder Diffraction. J. Solid State Chem., 1986, 63: 216-216.

[4] Daliang Sun, Yongyuan Song, Quanzhong Jiang, . Growth of Photorefractive Cu-doped KNSBN Crystal. J. Chin. Syn. Cryst., 1992, 21(2): 110-110.

[5] Neurgaokar R R, Cory W K, Oliver J R, . Growth and Ferroelectric Properties of Tungsten Bronze Sr_2−x xCa _x xNaNb₅O₁₅ Single Crystals. Mater. Res. Bull, 1988, 23(10): 1459-1459.

[6] Neurgaonkar R R, Nelson J G, Oliver J R. Ferroelectric Properties of the Tungsten Bronze M²⁺6M₂ ⁴⁺Nb₈O₃₀ Solid Solution Systems. Mater. Res. Bull, 1992, 27: 677-677.

[7] Neurgaonkar R R, Nelson J G, Oliver J R, . Structure and Ferroelectric Properties of the Tungsten Bronze Systems K₂Ln³⁺Nb₅O₁₅. Mater. Res. Bull, 1990, 25: 959-959.

[8] Liang Fang, Hui Zhang, Bolin Wu, Runzhang Yuan. Synthesis, Crystal Structure and Ferroelectric Properties of A New Niobate: Sr₆CrNb₉O₃₀. Progress in Crystal Growth and Characterization of Materials, 2000, 40(1): 161-165.