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The role of Sb5+ in the structure of Sb2O 3-B2O3 binary glasses - An NMR and Mössbauer spectroscopy study

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  • D. Holland
  • A.C. Hannon
  • M.E. Smith
  • C.E. Johnson
  • M.F. Thomas
  • A.M. Beesley
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<mark>Journal publication date</mark>11/2004
<mark>Journal</mark>Solid State Nuclear Magnetic Resonance
Issue number3-4 SPEC. ISS.
Volume26
Number of pages8
Pages (from-to)172-179
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Glasses of general formula xSb2O3 (1-x)B 2O3 (0≤x≤0.8) 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 [BO 4]- were stabilised by [SbO4]+ but the trends with composition are different. © 2004 Elsevier Inc. All rights reserved.