Determination of the bond-angle distribution in vitreous B2O3 by 11B double rotation (DOR) NMR spectroscopy

被引：39

作者：

Hung, I. ^{[1
]}

Howes, A. P. ^{[1
]}

Parkinson, B. G. ^{[1
]}

Anupold, T. ^{[2
]}

Samoson, A. ^{[2
]}

Brown, S. P. ^{[1
]}

Harrison, P. F. ^{[1
]}

Holland, D. ^{[1
]}

Dupree, R. ^{[1
]}

机构：

[1] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[2] NICPB, Tallinn, Estonia

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2009年 / 182卷 / 09期

基金：

英国生物技术与生命科学研究理事会; 英国工程与自然科学研究理事会;

关键词：

B-11; DOR; MQDOR; NMR; Spin-diffusion; B2O3; Glass; HIGH-RESOLUTION NMR; BOROXOL RINGS; SHORT-RANGE; NUCLEI; SPECTRA; SHIFTS; SITES; GLASS; MAS;

D O I：

10.1016/j.jssc.2009.06.025

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The B-O-B bond angle distributions for both ring and non-ring boron sites in vitreous B2O3 have been determined by B-11 double rotation (DOR) NMR and multiple-quantum (MQ) DOR NMR. The [B3O6] boroxol rings are observed to have a mean internal B-O-B angle of 120.0+/-0.7 degrees with a small standard deviation, sigma(R) = 3.2+/-0.4 degrees, indicating that the rings are near-perfect planar, hexagonal structures. The rings are linked predominantly by non-ring [BO3] units, which share oxygens with the boroxol ring, with a mean B-ring-O-Bnon-ring angle of 135.1+/-0.6 degrees and sigma(NR) = 6.7+/-0.4 degrees. In addition, the fraction of boron atoms, f, which reside in the boroxol rings has been measured for this sample as f = 0.73+/-0.01. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：2402 / 2408

页数：7

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