Abstract
Polycrystalline samples of BiTa 1− x Nb x O 4 (0≦ x≦1) were synthesized by a solid state reaction and characterized by powder X-ray diffraction. Rietveld structure refinement revealed that the variation of x in BiTa 1− x Nb x O 4 (0≦ x≦1) could cause the change in crystal structure. The structure of BiTa 1− x Nb x O 4 ( x=0.0 and 0.5) is triclinic system with space group P1. However, the structure of x=0.2, 0.8 and 1.0 is orthorhombic system with space group Pnna. Ultraviolet–visible diffuse reflectance spectroscopy measurement revealed that the band gap of triclinic compounds is wider than that of orthorhombic compounds.
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