Medium-range order in cesium borate glasses probed by double-resonance NMR

Rotational-echo double-resonance NMR is used to probe the proximity of Cs + network modifiers to network-forming boron in binary cesium borate glasses. Low- and high-alkali glasses show distinctly different dephasing curves, which indicate preferential association of Cs + with four-co-ordinate boron...

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Bibliographic Details
Published inSolid state nuclear magnetic resonance Vol. 27; no. 1; pp. 10 - 15
Main Authors Aguiar, Pedro M., Kroeker, Scott
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier Inc 2005
Subjects
Boron-11 NMR
Cesium borate glasses
Medium-range order
Quadrupolar nuclei
REDOR NMR
Solid-state NMR
Quadrupolar nuclei
Solid-state NMR
REDOR NMR
Cesium borate glasses
Boron-11 NMR
Medium-range order
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Summary:Rotational-echo double-resonance NMR is used to probe the proximity of Cs + network modifiers to network-forming boron in binary cesium borate glasses. Low- and high-alkali glasses show distinctly different dephasing curves, which indicate preferential association of Cs + with four-co-ordinate boron ( [4]B) at low-alkali contents only. Different [4]B sites within a given glass appear to be subject to the same 133Cs dipolar field, thus placing constraints on the possible assignments of multiple tetrahedral boron peaks to different types of medium-range order and guiding future structural modeling studies.
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ISSN:0926-2040
1527-3326
DOI:10.1016/j.ssnmr.2004.08.009