A new niobate crystal was synthesized for the first time in BaO-NaO-Cr2O3-Nb2O3 system by the 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 X-ray powder diffraction shows that Ba5NaCr0.5Nb9.5O30 belongs to the tetragonal tungsten bronze structure, with space group P4 bm(100) and lattice parameters a=b=12.4450(2)A°,c=3.9931(2)A° and Z=1. The X-ray powder diffraction lines of the compound were well indexed.
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