The local structure around the Nd3+ ions in 60%-exchanged sodium beta''-alumina was studied by X-ray absorption spectroscopy. The analysis of the Nd L3-edge experimental data shows that neodymium ions are mainly located near mid-oxygen (9d) sites. The local environment of Nd is slightly changed compared to crystallographic positions: the Nd-O(5) distance is shortened by 0.36 angstrom, while the Nd-Al (6c) is increased by 0.13 angstrom. The values of Debye-Waller factors of different coordination shells are discussed in terms of vibrational correlation.

EXAFS STUDY OF ND3+-EXCHANGED BETA''-ALUMINA CRYSTAL

MARIOTTO, Gino
1994

Abstract

The local structure around the Nd3+ ions in 60%-exchanged sodium beta''-alumina was studied by X-ray absorption spectroscopy. The analysis of the Nd L3-edge experimental data shows that neodymium ions are mainly located near mid-oxygen (9d) sites. The local environment of Nd is slightly changed compared to crystallographic positions: the Nd-O(5) distance is shortened by 0.36 angstrom, while the Nd-Al (6c) is increased by 0.13 angstrom. The values of Debye-Waller factors of different coordination shells are discussed in terms of vibrational correlation.
EXAFS, LOCAL STRUCTURE, BETA''-ALUMINA.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11562/434843
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