Short-range order of sodium-zinc, sodium-copper, and sodium-nickel pyrophosphate glasses by diffractometric and spectroscopic techniques

Bruni, S., Cariati, F., Corrias, A., Gaskell, P.H., Lai, A., Musinu, A., Piccaluga, G. (1995) Short-range order of sodium-zinc, sodium-copper, and sodium-nickel pyrophosphate glasses by diffractometric and spectroscopic techniques. Journal of Physical Chemistry, 99 (41). pp. 15229-15235. ISSN 0022-3654. (doi:10.1021/j100041a044) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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http://dx.doi.org/10.1021/j100041a044

Abstract

Short-range order has been investigated in three glasses with composition 0.30MeO·0.35Na2O·0.35P2O5 (Me = Ni, Zn, Cu), which are composed of small, ionic units. X-ray diffraction has been used to study the cation coordination; average coordination numbers turned out to be about 6 for Ni2+, 5 for Cu2+, and 4.5 for Zn2+. More detailed information has been obtained for Ni2+ through neutron diffraction with isotopic substitution and for Ni2+ and Cu2+ through analysis of their electronic spectra; distorted octahedral and square-based pyramidal geometries are suggested respectively for Ni2+ and Cu2+. Anionic speciation has been investigated by IR and Raman spectroscopies; the Zn glass has been also examined by 31P MAS-NMR spectroscopy. All three glasses were found to be almost exclusively composed of pyrophosphate units. These observations are in agreement with the Van Wazer's fully ionic modifying oxide model for phosphate glasses.

Item Type: Article
DOI/Identification number: 10.1021/j100041a044
Subjects: Q Science > QC Physics > QC176.8.N35 Nanoscience, nanotechnology
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Anna Corrias
Date Deposited: 17 Dec 2014 12:21 UTC
Last Modified: 29 May 2019 13:57 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46239 (The current URI for this page, for reference purposes)
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