Phase relations in the system K{sub 2}MoO{sub 4}-KPO{sub 3}-MoO{sub 3}-Bi{sub 2}O{sub 3}: A new phosphate K{sub 3}Bi{sub 5}(PO{sub 4}){sub 6}

Journal Article · Sat Dec 15 04:00:00 EST 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2007.10.001· OSTI ID:21043762

Terebilenko, Kateryna V ^[1]; Slobodyanik, Nikolay S; Domasevitch, Konstantin V ^[1]; Pushkin, Denis V ^[2]; Baumer, Vyacheslav N ^[3]; Sudavtsova, Valentina S ^[4]

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1. Inorganic Chemistry Department, Kiev University, Volodimirska Street 64, Kiev 01033 (Ukraine)
2. Samara State University, Ac. Pavlov St. 1, Samara 443011 (Russian Federation)
3. STC 'Institute for Single Crystals' NAS of Ukraine, 60 Lenin ave., Kharkiv 61001 (Ukraine)
4. Physical Chemistry Department, Kiev University, Volodimirska Street 64, Kiev 01033 (Ukraine)

Phase equilibrium in the pseudo-quaternary system K{sub 2}O-MoO{sub 3}-P{sub 2}O{sub 5}-Bi{sub 2}O{sub 3} was studied as three-component solvent K{sub 2}MoO{sub 4}-KPO{sub 3}-MoO{sub 3} containing 15 mol% Bi{sub 2}O{sub 3} during slow cooling and spontaneous crystallization. The results of the investigation were shown on a composition diagram, which indicates the crystallization fields of K{sub 2}Bi(PO{sub 4})(MoO{sub 4}), K{sub 5}Bi(MoO{sub 4}){sub 4}, BiPO{sub 4} and K{sub 3}Bi{sub 5}(PO{sub 4}){sub 6}. New phosphate K{sub 3}Bi{sub 5}(PO{sub 4}){sub 6} was characterized by single-crystal X-ray diffraction (space group C2/c, a=17.680(4), b=6.9370(14), c=18.700(4) A, {beta}=113.79(3){sup o}) and FTIR spectroscopy. The possibility of lone electron pair stereoactivity of bismuth was suggested using the calculations of characteristics of the Voronoi-Dirichlet polyhedra for K{sub 3}Bi{sub 5}(PO{sub 4}){sub 6} and K{sub 2}Bi(PO{sub 4})(MoO{sub 4}). - Graphical abstract: Composition diagram of the K{sub 2}MoO{sub 4}-KPO{sub 3}-MoO{sub 3} system containing 15 mol% Bi{sub 2}O{sub 3} with approximate fields of phase formation bismuth phosphates, molybdate and phosphate-molybdate.

• OSTI ID: 21043762
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 12 Vol. 180; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
BISMUTH OXIDES
BISMUTH PHOSPHATES
CRYSTALLIZATION
ELECTRON PAIRS
FOURIER TRANSFORMATION
INFRARED SPECTRA
MOLYBDATES
MOLYBDENUM OXIDES
MONOCLINIC LATTICES
MONOCRYSTALS
PHOSPHORUS OXIDES
POTASSIUM OXIDES
SOLVENTS
SPACE GROUPS
SPECTROSCOPY
X-RAY DIFFRACTION