The structure of glasses in the system of xCeO 2 (100 - x)B 2 O 3 , x = 30, 40, 50 mol% CeO 2 has been explored for the first time by correlation between data obtained from XRD, FTIR and 11 B NMR analy s es. NMR spectroscopy and FTIR spectroscopy have confirmed that transformation rate of BO 3 to BO 4 groups is reduced by CeO 2 addition. The concentration of Ce 4 -O-Ce 4 is increased at the expense of both B 4 -O-Ce 4 and B 3 -O-B 4 linkages. Boron atoms are mainly coordinated with Ce 4 sites as second neighbor s due to increasing CeO 4 species with further increase of CeO 2 concentration. Increasing B 4 fraction is considered due to forming of CeO 4 with rate higher than that of BO 4 units. The change of chemical shift of 11 B nuclei upon exchanging B 2 O 3 with CeO 2 confirms that the central boron atoms would be coordinated with tetrahedral cerium atoms as second neighbors. The X-ray diffraction of cerium rich glass is clearly indicated that the formation of crystalline phases refer s to CeO 4 , CeBO 3 and Ce(BO 2 ) 3 species.
KeywordsBorateCeriumFormer UnitsNMR Analysis
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