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Title: Investigation of Sodium Distribution in Phosphate Glasses Using Spin-Echo {sup 23}Na NMR

Abstract

The spatial arrangement of sodium cations for a series of sodium phosphate glasses, xNa{sub 2}O(100-x)P{sub 2}O{sub 5} (x<55), were investigated using {sup 23}Na spin-echo NMR spectroscopy. The spin-echo decay rate is a function of the Na-Na homonuclear dipolar coupling and is related to the spatial proximity of neighboring Na nuclei. The spin-echo decay rate in these sodium phosphate glasses increases non-linearly with higher sodium number density, and thus provides a measure of the Na-Na extended range order. The results of these {sup 23}Na NMR experiments are discussed within the context of several structural models, including a decimated crystal lattice model, cubic dilation lattice model, a hard sphere (HS) random distribution model and a pair-wise cluster hard sphere model. While the experimental {sup 23}Na spin-echo M{sub 2} are described adequately by both the decimated lattice and the random HS model, it is demonstrated that the slight non-linear behavior of M{sub 2} as a function of sodium number density is more correctly described by the random distribution in the HS model. At low sodium number densities the experimental M{sub 2} is inconsistent with models incorporating Na-Na clustering. The ability to distinguish between Na-Na clusters and non-clustered distributions becomes more difficult at highermore » sodium concentrations.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
12675
Report Number(s):
SAND99-2408J
TRN: AH200120%%381
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article
Journal Name:
Journal Physical Chemistry, B
Additional Journal Information:
Other Information: Submitted to Journal Physical Chemistry, B; PBD: 16 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; PHOSPHATE GLASS; CRYSTAL LATTICES; SPATIAL DISTRIBUTION; HARD-SPHERE MODEL; SODIUM; NUCLEAR MAGNETIC RESONANCE; SPIN ECHO

Citation Formats

ALAM, TODD M., BOYLE, TIMOTHY J., BROW, RICHARD K., CLICK, CAROL C., CONZONE, SAM, McLAUGHLIN, JAY, and ZWANZIGER, JOE. Investigation of Sodium Distribution in Phosphate Glasses Using Spin-Echo {sup 23}Na NMR. United States: N. p., 1999. Web.
ALAM, TODD M., BOYLE, TIMOTHY J., BROW, RICHARD K., CLICK, CAROL C., CONZONE, SAM, McLAUGHLIN, JAY, & ZWANZIGER, JOE. Investigation of Sodium Distribution in Phosphate Glasses Using Spin-Echo {sup 23}Na NMR. United States.
ALAM, TODD M., BOYLE, TIMOTHY J., BROW, RICHARD K., CLICK, CAROL C., CONZONE, SAM, McLAUGHLIN, JAY, and ZWANZIGER, JOE. Thu . "Investigation of Sodium Distribution in Phosphate Glasses Using Spin-Echo {sup 23}Na NMR". United States. https://www.osti.gov/servlets/purl/12675.
@article{osti_12675,
title = {Investigation of Sodium Distribution in Phosphate Glasses Using Spin-Echo {sup 23}Na NMR},
author = {ALAM, TODD M. and BOYLE, TIMOTHY J. and BROW, RICHARD K. and CLICK, CAROL C. and CONZONE, SAM and McLAUGHLIN, JAY and ZWANZIGER, JOE},
abstractNote = {The spatial arrangement of sodium cations for a series of sodium phosphate glasses, xNa{sub 2}O(100-x)P{sub 2}O{sub 5} (x<55), were investigated using {sup 23}Na spin-echo NMR spectroscopy. The spin-echo decay rate is a function of the Na-Na homonuclear dipolar coupling and is related to the spatial proximity of neighboring Na nuclei. The spin-echo decay rate in these sodium phosphate glasses increases non-linearly with higher sodium number density, and thus provides a measure of the Na-Na extended range order. The results of these {sup 23}Na NMR experiments are discussed within the context of several structural models, including a decimated crystal lattice model, cubic dilation lattice model, a hard sphere (HS) random distribution model and a pair-wise cluster hard sphere model. While the experimental {sup 23}Na spin-echo M{sub 2} are described adequately by both the decimated lattice and the random HS model, it is demonstrated that the slight non-linear behavior of M{sub 2} as a function of sodium number density is more correctly described by the random distribution in the HS model. At low sodium number densities the experimental M{sub 2} is inconsistent with models incorporating Na-Na clustering. The ability to distinguish between Na-Na clusters and non-clustered distributions becomes more difficult at higher sodium concentrations.},
doi = {},
journal = {Journal Physical Chemistry, B},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {9}
}