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

文献信息

发布日期 2001-07-05
DOI 10.1039/B102385N
影响因子 3.676
作者

Pietro Riello, Stefano Polizzi, Giuliano Fagherazzi, Tiziano Finotto, Sergio Ceresara


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摘要

Strong interference effects in the X-ray small angle scattering (SAXS) intensity 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 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 ( = 1.6) than those formed at higher temperatures for some hours, which are composed of stoichiometric ( = 1) magnesium oxide.

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来源期刊

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
自引率: 10.3%
年发文量: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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