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A molecular dynamics model of the atomic structure of dysprosium alumino-phosphate glass

Martin, Richard A., Mountjoy, Gavin, Newport, Robert J. (2009) A molecular dynamics model of the atomic structure of dysprosium alumino-phosphate glass. Journal of Physics: Condensed Matter, 21 (7). ISSN 0953-8984. (doi:10.1088/0953-8984/21/7/075102) (KAR id:15918)

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https://doi.org/10.1088/0953-8984/21/7/075102

Abstract

Molecular dynamics (MD) has been used to identify the relative distribution of dysprosium in the phosphate glass DyAl0.30P3.05O9.62. The MD model has been compared directly with experimental data obtained from neutron diffraction to enable a detailed comparison beyond the total structure factor level. The MD simulation gives \mathrm {Dy\cdots Dy} correlations at 3.80(5) and 6.40(5) Å with relative coordination numbers of 0.8(1) and 7.3(5), thus providing evidence of minority rare-earth clustering within these glasses. The nearest neighbour Dy–O peak occurs at 2.30 Å with each Dy atom having on average 5.8 nearest neighbour oxygen atoms. The MD simulation is consistent with the phosphate network model based on interlinked PO4 tetrahedra where the addition of network modifiers Dy3+ depolymerizes the phosphate network through the breakage of P–(O)–P bonds whilst leaving the tetrahedral units intact. The role of aluminium within the network has been taken into explicit account, and Al is found to be predominantly (78%) tetrahedrally coordinated. In fact all four Al bonds are found to be to P (via an oxygen atom) with negligible amounts of Al–O–Dy bonds present. This provides an important insight into the role of Al additives in improving the mechanical properties of these glasses.

Item Type: Article
DOI/Identification number: 10.1088/0953-8984/21/7/075102
Additional information: ISI Document Delivery No.: 400VK Times Cited: 0 Cited Reference Count: 43 Martin, Richard A. Mountjoy, Gavin Newport, Robert J.
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: J.M. Smith
Date Deposited: 13 May 2009 14:06 UTC
Last Modified: 27 Jan 2020 04:02 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/15918 (The current URI for this page, for reference purposes)
Mountjoy, Gavin: https://orcid.org/0000-0002-6495-2006
Newport, Robert J.: https://orcid.org/0000-0002-2365-992X
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