| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1333085 | Journal of Solid State Chemistry | 2011 | 7 Pages |
The crystallization of complex phosphates from the melts of Cs2O–P2O5–CaO–MIII2O3 (MIII—Al, Fe, Cr) systems have been investigated at fixed value Cs/P molar ratios equal to 0.7, 1.0 and 1.3 and Са/Р=0.2 and Ca/МIII=1. The fields of crystallization of CsCaP3O9, β-Ca2P2O7, Cs2CaP2O7, Cs3CaFe(P2O7)2, Ca9MIII(PO4)7 (MIII—Fe, Cr), Cs0.63Ca9.63Fe0.37(PO4)7 and CsCa10(PO4)7 were determined. Obtained phosphates were investigated using powder X-ray diffraction and FTIR spectroscopy. Novel whitlockite-related phases CsCa10(PO4)7 and Cs0.63Ca9.63Fe0.37(PO4)7 have been characterized by single crystal X-ray diffraction: space group R3c, a=10.5536(5) and 10.5221(4) Å, с=37.2283(19) and 37.2405(17) Å, respectively.
Graphical AbstractStructural relationships between β-Ca3(PO4)2 and synthesized compounds is shown in terms aliovalent substitution of calcium atoms, which residue on three-fold axis, by other metals in β-Ca3(PO4)2 framework.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► Phase formation in the melts of Cs2O–P2O5–CaO–MIII2O3 (MIII—Al, Fe, Cr) systems were determined. ► The composition and structure of the compounds depend on the nature of MIII and initial ratio of Cs/P. ► Obtained compounds have been characterized by powder X-ray diffraction and FTIR spectroscopy. ► Crystal structures of CsCa10(PO4)7 and Cs0.63Ca9.63Fe0.37(PO4)7 were determined by single crystal XRD.
