TY - JOUR
T1 - A new anhydrous bismuth potassium nitrate, K 3Bi 2(NO 3) 9
T2 - Synthesis, structure characterization and thermal decomposition
AU - Goaz, A.
AU - Uvarov, V.
AU - Popov, I.
AU - Shenawi-Khalil, S.
AU - Sasson, Y.
PY - 2012/2/15
Y1 - 2012/2/15
N2 - 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) , and belongs to P4 332 (No. 212) space group. New phase is isostructural with the K 3Ln 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). 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.
AB - 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) , and belongs to P4 332 (No. 212) space group. New phase is isostructural with the K 3Ln 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). 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.
KW - Anhydrous double nitrates
KW - Bismuth nitrates
KW - Ionic radius
KW - Rietveld refinement
KW - Thermal decomposition
UR - http://www.scopus.com/inward/record.url?scp=84455205501&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2011.10.066
DO - 10.1016/j.jallcom.2011.10.066
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AN - SCOPUS:84455205501
SN - 0925-8388
VL - 514
SP - 30
EP - 34
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -