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Ozërsk, Russia

Stefanovsky S.V.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Myasoedov B.F.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Remizov M.B.,PA Mayak | Belanova E.A.,PA Mayak
Journal of Applied Spectroscopy | Year: 2014

The structure of sodium-aluminophosphate glasses containing constituents of high-level wastes (cesium, magnesium, copper, and molybdenum oxides) from uranium-graphite reactors was studied by IR and Raman spectroscopy coupled with x-ray diffraction. The structural network was shown to be composed of short P-O chains with embedded AlO4 tetrahedra. Cross-linking by Mg2+ was possible in the Mg-bearing samples. The effect of the other oxides (Cs2O, MoO3, CuO) on the glass structure was negligible for the occurring amounts. The glasses devitrified partially upon quenching and more strongly upon annealing. This was reflected in splitting of the vibrational bands for bonds in the glass anionic structural motif. © 2014, Springer Science+Business Media New York. Source

Remizov M.B.,PA Mayak | Belanova E.A.,PA Mayak | Stefanovsky S.V.,Russian Academy of Sciences | Myasoedov B.F.,Russian Academy of Sciences | Nikonov B.S.,RAS Institute of Geology and Mineralogy
Glass Physics and Chemistry | Year: 2014

Molybdenum-, copper-, and cesium-containing glass based on aluminophosphate designed to immobilize high-active wastes (HAWs), which are formed at the reprocessing of spent nuclear fuel (SNF) from Atom Peaceful Big (AMB) nuclear reactor, have been synthesized and studied by means of the X-ray diffraction and electron-microscopy methods. After quenching the melts, glass, which partially crystallizes at annealing, is formed. The introduction of magnesium oxide in aluminophosphate glass increases its crystallization resistance; and molybdenum oxide, decreases. The samples crystallize after heat treatment with the formation of aluminum and sodium-aluminum orthophosphates and solid solution of the (Na,Cs)3−3xAlxPO4 composition. © 2014, Pleiades Publishing, Ltd. Source

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