Abstract
A new K 3Bi 2(NO 3) 9 phase was discovered at a synthesis of Bi-containing photocatalysts. K 3Bi 2(NO 3) 9 has cubic structure with unit cell parameter a = 13.5354(20) Å, and belongs to P4 332 (No. 212) space group. New phase is isostructural with the K 3 Ln 2(NO 3) 9 ( Ln = La, Ce, Pr, Nd, and Sm) phases. The crystal structure was refined from powder X-ray diffraction (XRD) data. The R wp factor at Rietveld refinement was equal to 8.62%. The morphology of K 3Bi 2(NO 3) 9 was characterized using scanning electron microscopy. The value of ionic radius of Bi 3+ in 12-fold coordination calculated from the unit cell parameter was found to be 1.314(5) Å. K 3Bi 2(NO 3) 9 phase and products of its thermal decomposition were studied using XRD, Fourier transform infrared spectroscopy (FTIR) methods and thermal gravimetric analysis (TGA). At 350 °C, K 3Bi 2(NO 3) 9 phase was transformed to new unknown intermediate bismuth potassium nitrate that most likely belongs to Sillen type of structure. Geometrical solution for unit cell of this phase was proposed.
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