Measuring oxygen-phosphorus distances and the orientation of electric field gradient tensors using 170-{31P} REDOR in phosphate glasses

Rotational echo double resonance (REDOR) of spin-1/2 nuclei is an extremely useful tool for the determination of distances in solids as well as of relative orientations of chemical shift and dipole tensors. We present the corresponding version for measuring the relative orientation of electric quadr...

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Bibliographic Details
Published in:Solid state nuclear magnetic resonance 2003-05, Vol.23 (3), p.136-144
Main Authors: Zeyer, M, Montagne, L, Jaeger, C
Format: Article
Language:English
Online Access:Get full text
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Summary:Rotational echo double resonance (REDOR) of spin-1/2 nuclei is an extremely useful tool for the determination of distances in solids as well as of relative orientations of chemical shift and dipole tensors. We present the corresponding version for measuring the relative orientation of electric quadrupole and dipole tensors and demonstrate its applicability for non-bridging oxygens in phosphate glasses using 170-{31P} REDOR NMR. The orientational information is found in the changes of the second-order quadrupole patterns as a function of the echo delay. Results and numeric simulations are presented for 17O-{31P} REDOR NMR of 170-enriched sodium phosphate glasses. For non-bridging oxygens, the symmetric quadrupole tensor is found to be aligned along the phosphorus-oxygen bond. The distance between P and the non-bridging oxygen is calculated for two glasses of different compositions.
ISSN:0926-2040