Issue 15, 2001

Small angle scattering of Ag–1 wt.% Mg alloys internally oxidized at high temperatures: a model of interacting spherical clusters

Abstract

Strong interference effects in the X-ray small angle scattering (SAXS) intensity [italic v (to differentiate from Times ital nu)]s. scattering-angle plot are shown to appear in foil specimens of a relatively concentrated Ag–Mg alloy (1 wt.% Mg corresponding to 4.3 at.% Mg) treated in air under two very different high temperature conditions. Such interference effects are ascribed to MgO[italic v (to differentiate from Times ital nu)] clusters formed during an internal oxidation process and are quantitatively evaluated applying a special theoretical approach based on a model of interacting spherical particles. It is found that, in the sample oxidised at 1023 K for 2 min, particles with a surface-weighted average diameter of 1.4 nm are present and occupy 5.4% of the sample volume. In the sample oxidised at 1123 K for 6 h, the particles are larger (3.3 nm) and represent a 3.8% volume fraction. The clusters formed at lower temperatures for a few minutes are much richer in oxygen ([italic v (to differentiate from Times ital nu)] = 1.6) than those formed at higher temperatures for some hours, which are composed of stoichiometric ([italic v (to differentiate from Times ital nu)] = 1) magnesium oxide.

Article information

Article type
Paper
Submitted
13 Mar 2001
Accepted
31 May 2001
First published
05 Jul 2001

Phys. Chem. Chem. Phys., 2001,3, 3213-3216

Small angle scattering of Ag–1 wt.% Mg alloys internally oxidized at high temperatures: a model of interacting spherical clusters

P. Riello, S. Polizzi, G. Fagherazzi, T. Finotto and S. Ceresara, Phys. Chem. Chem. Phys., 2001, 3, 3213 DOI: 10.1039/B102385N

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