Synthesis and characterization of phosphates in molten systems Cs2O-P2O5-CaO-M2O3 (M—Al, Fe, Cr) |
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| Authors: | Igor V. Zatovsky Nataliya Yu. Strutynska Nikolay S. Slobodyanik Oleg V. Shishkin |
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| Affiliation: | a Department of Inorganic Chemistry, Taras Shevchenko National University, Volodymyrska str. 64, Kyiv 01601, Ukraine
b STC “Institute for Single Crystals”, National Academy of Science of Ukraine, Lenina ave. 60, Kharkiv 61001, Ukraine |
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| Abstract: | 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. |
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| Keywords: | Caesium-containing phosphates Whitlockite Flux Crystal structure FTIR spectroscopy |
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