Synthesis and characterization of phosphates in molten systems Cs{sub 2}O-P{sub 2}O{sub 5}-CaO-M{sup III}{sub 2}O{sub 3} (M{sup III}-Al, Fe, Cr)

Journal Article · Tue Mar 15 04:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.01.042· OSTI ID:21494220

Strutynska, Nataliya Yu ^[1]; Baumer, Vyacheslav N ^[2]; Slobodyanik, Nikolay S; Ogorodnyk, Ivan V ^[1]; Shishkin, Oleg V ^[2]

---

1. Department of Inorganic Chemistry, Taras Shevchenko National University, Volodymyrska str. 64, Kyiv 01601 (Ukraine)
2. STC 'Institute for Single Crystals', National Academy of Science of Ukraine, Lenina ave. 60, Kharkiv 61001 (Ukraine)

The crystallization of complex phosphates from the melts of Cs{sub 2}O-P{sub 2}O{sub 5}-CaO-M{sup III}{sub 2}O{sub 3} (M{sup III}-Al, Fe, Cr) systems have been investigated at fixed value Cs/P molar ratios equal to 0.7, 1.0 and 1.3 and Sa/P=0.2 and Ca/M{sup III}=1. The fields of crystallization of CsCaP{sub 3}O{sub 9}, {beta}-Ca{sub 2}P{sub 2}O{sub 7}, Cs{sub 2}CaP{sub 2}O{sub 7}, Cs{sub 3}CaFe(P{sub 2}O{sub 7}){sub 2}, Ca{sub 9}M{sup III}(PO{sub 4}){sub 7} (M{sup III}-Fe, Cr), Cs{sub 0.63}Ca{sub 9.63}Fe{sub 0.37}(PO{sub 4}){sub 7} and CsCa{sub 10}(PO{sub 4}){sub 7} were determined. Obtained phosphates were investigated using powder X-ray diffraction and FTIR spectroscopy. Novel whitlockite-related phases CsCa{sub 10}(PO{sub 4}){sub 7} and Cs{sub 0.63}Ca{sub 9.63}Fe{sub 0.37}(PO{sub 4}){sub 7} have been characterized by single crystal X-ray diffraction: space group R3c, a=10.5536(5) and 10.5221(4) A, c=37.2283(19) and 37.2405(17) A, respectively. -- Graphical Abstract: Structural relationships between {beta}-Ca{sub 3}(PO{sub 4}){sub 2} and synthesized compounds is shown in terms aliovalent substitution of calcium atoms, which residue on three-fold axis, by other metals in {beta}-Ca{sub 3}(PO{sub 4}){sub 2} framework. Display Omitted Research highlights: {yields} Phase formation in the melts of Cs{sub 2}O-P{sub 2}O{sub 5}-CaO-M{sup III}{sub 2}O{sub 3} (M{sup III}-Al, Fe, Cr) systems were determined. {yields} The composition and structure of the compounds depend on the nature of M{sup III} and initial ratio of Cs/P. {yields} Obtained compounds have been characterized by powder X-ray diffraction and FTIR spectroscopy. {yields} Crystal structures of CsCa{sub 10}(PO{sub 4}){sub 7} and Cs{sub 0.63}Ca{sub 9.63}Fe{sub 0.37}(PO{sub 4}){sub 7} were determined by single crystal XRD.

• OSTI ID: 21494220
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 3 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTROSCOPY
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CALCIUM PHOSPHATES
CESIUM COMPOUNDS
CESIUM OXIDES
CESIUM PHOSPHATES
CHALCOGENIDES
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALLIZATION
CRYSTALS
DIFFRACTION
INFRARED SPECTRA
IRON COMPOUNDS
IRON OXIDES
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHOSPHORUS OXIDES
SCATTERING
SPACE GROUPS
SPECTRA
SPECTROSCOPY
SYMMETRY GROUPS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRIGONAL LATTICES
X-RAY DIFFRACTION