The role of Sb in the structure of Sb2O3–B2O3 binary glasses—an NMR and Mössbauer spectroscopy study |
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| Authors: | D Holland A C Hannon M E Smith C E Johnson M F Thomas A M Beesley |
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| Institution: | a Department of Physics, University of Warwick, Coventry CV4 7AL, UK;b ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK;c Physics Department, Northern Illinois University, DeKalb, IL60115, USA;d Physics Department, University of Liverpool, Liverpool L69 3BX, UK |
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| Abstract: | Glasses of general formula xSb2O3 (1−x)B2O3 (0x0.8) have been prepared by conventional melt- quenching. Mössbauer spectroscopy shows that a fraction of the Sb3+ is converted to Sb5+ and this fraction increases with x. High-field 11B MAS NMR gives well-resolved resonances from boron atoms which are 3- and 4-coordinated to oxygen. The fraction of 4-coordinated boron, N4, goes through a maximum value of 0.12±0.01 at x=0.5. The position of the maximum in N4 is consistent with the cation potential for Sb3+, as observed for other systems. However, the low value of N4 at this maximum is not so readily explained. The values are similar to those predicted if BO4]− were stabilised by SbO4]+ but the trends with composition are different. |
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| Keywords: | Antimony Borate Glass Mö ssbauer spectroscopy MAS NMR |
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