Abstract
The effect of Nb 2 O 5 content on the microstructure development and the dielectric characteristics of tungsten-bronze-structured polycrystalline Ba 2 Na 1 Nb 5 O 15 (BNN) ceramics was studied. The compositions of stoichiometry, Nb 2 O 5–deficient and Nb 2 O 5–excess BNN were prepared and sintered at 1250 °C for 2 h in oxygen. We report the development of second phases, microstructure and dielectric behavior of polycrystalline BNN ceramics, which was not reported ever. The Nb 2 O 5 content affect lattice constant of the sintered body, which contributed to the change of phase transformation temperature. The stoichiometric BNN showed the lowest densification, while an optically transparent sample was obtained in Nb 2 O 5–excess highly dense sample.
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