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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. N-ray microanalysis, chemical analysis and SEM. The result of the X-ray diffraction shows that Ba5 NaCo0.5 Nb9.5 OK) belongs to tetragonal tungsten bronze structure with space group P4bm( 100) and lattice parameters a = b = 12.4453(2) A, c = 3. 9770 (3) A and Z = 1. The structure of the compound is different from that ofrrrrrrrrrnBa4Na2Nb10O30
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. N-ray microanalysis, chemical analysis and SEM. The result of the X-ray diffraction analysis of the Ba5 NaCo0.5 Nb9.5 OK) belongs to a tetragonal tungsten bronze structure with space group P4bm (100) and lattice parameters a = b = 12.4453 (2) A, c = 3 . 9770 (3) A and Z = 1. The structure of the compound is different from that of r r r r r r r r nBa4Na2Nb10O30