Abstract
Abstract The effects of different additions of Bi 2 O 3 (0, 2, 5 and 10 wt.%) on Na 2 Nb 4 O 11 ceramics have been studied by complex impedance spectroscopy analysis. The structural and dielectric properties of Na 2 Nb 4 O 11 ceramics with Bi 2 O 3 additions are also discussed as a possible material for microwave and radio frequency applications. Solid state reaction method was used for producing the target compound. The present work also reports on sample preparation, where polyvinyl alcohol was used as a binder to reduce the brittleness and the organic binder was burnt out during sintering process. X-ray diffraction at room temperature was used to identify phases formed as well as optimum calcinations conditions the production of Na 2 Nb 4 O 11 powder. Analysis was carried out to identify the pure-phase specimen by Rietveld refinement method. Based on this method a structure with the lattice parameters ( a = 10.840 A, b = 6.162 A and c = 12.745 A; α = 90°, β = 106.4° and γ = 90°) was found. The dielectric and electrical properties of Na 2 Nb 4 O 11 for appropriate amounts of Bi 2 O 3 additions has showed a considerable enhancement and overriding applications for microwave and radio frequency communications. The electrical behavior (complex impedance Z * , complex modulus M * ) were studied over a frequency range (1 Hz to 1 MHz) and temperature (553–713 K).
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