A new niobate crystal was synthesized for the first time in BaO-Na2O-Co2O3-Nb2O5 system by solid state reaction and the flux method. The new compound was studied by X-ray diffraction, electron probe, X-ray microanalysis,chemical analysis and SEM. The result of the X-ray diffraction shows that Ba5NaCo0.5Nb9.5O30 belongs to tetragonal tungsten bronze structure with space group P4bm(100) and lattice parameters a=b=12.4453(2), c=3.9770(3) and Z=1. The structure of the compound is different from that of Ba4Na2Nb10O30.
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