Synthesis and dielectric properties of Ba₃NaBiNb₁₀O₃₀ ceramics

Abstract

A new niobate Ba₃NaBiNb₁₀O₃₀ was synthesized by the solid state reaction. The reaction mixture was characterized by thermogravimetric and differential thermal analysis (TG-DTA), X-ray diffraction and dielectric constant measurements. The results show that Ba₃NaBiNb₁₀O₃₀ has an orthorhombic tungsten bronze structure with space group Cmm2 and the unit cell parameters are a=1.7660(1) nm, a=1.7626(1) nm, c=0. 78621(6) nm, Z=4. Ba₃NaBiNb₁₀O₃₀ undergoes two phase transitions at 200°C and 400°C, respectively.

Keywords

tungsten bronze structure / X-ray diffraction / dielectric properties

References

[1] Neurgaonkar R R, Cory W K. Progress in Photorefractive Tungsten Bronze Crystals. J. Opt. Soc. B., 1986, 3: 274-274.

[2] Hui Zhang, Liang Fang, Runzhang Yuan. Synthesis and Dielectric Properties of a New Tantalate Ba₃TiTa₄O₁₅. Acta Phys.-Chim. Sin., 2001, 17: 747-747.

[3] 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: 161-165.

[4] Neurgaonkar R R, Cory W K, Oliver J R, . Growth and Ferroelectric Properties of Tungsten Bronze Sr₂-_xxCa_xxNaNb₅O₁₅ Single Crystals. Mater. Res. Bull, 1988, 23(10): 1459-1459.

[5] Neurgaonkar R R, Nelson J G, Oliver J R. Ferroelectric Properties of the Tungsten Bronze M₆ ²⁺ M₂ ⁴⁺Nb₈O₃₀ Solid Solution Systems. Mater. Res. Bull, 1992, 27: 677-677.

[6] Hui Zhang, Liang Fang, Bolin Wu, Runzhang Yuan. Structure and Ferroelectric Property of a NEW Niobate Sr₆FeNb₉O₃₀. J. Wuhan Univ. of Tech.-Mater. Sci. Ed., 2000, 15(4): 48-48.

[7] H Zhang, L Fang, B L Wu. JCPDS 49-539,Powder Diffraction File. ICDD, USA, 1998

[8] Errandonea G, savary H, Schneck J. Crystal Narrowing of a Central Peak at the Ferroelectric transition of Ba₂NaNb₅O₁₅. Ferroelectrics, 1984, 55: 19-19.

[9] Verwerft M, Van Tendeloo G, Van Landuyt J, . A Complementary Study by Electron Microscopy of Modulated Phases in Ba₂NaNb₅O₁₅. Ferroelectrics, 1988, 88: 27-27.