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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Surface oxidation of basalt glass/liquid
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Surface oxidation of basalt glass/liquid

机译：玄武岩玻璃/液体的表面氧化

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摘要

To evaluate surface oxidation of Fe2+-rich multi-component silicate glass, powder and pieces of natural basalt glass are heat-treated in Ar and subsequently investigated by Mossbauer spectroscopy to monitor the increase of Fe3+. Glass pieces show no increase in oxidation with time or temperature, suggesting that the oxygen potential between glass and At is insufficient to cause volume oxidation. In contrast, glass powder oxidizes readily to a degree comparable with that of powder oxidation in air, suggesting that surface oxidation does not depend on the oxygen potential. No cation diffusion to the glass surface is detected in Ar, though it is observed upon heat treatment in air; cation diffusion is therefore unlikely to be involved in oxidation. We suggest the following mechanism for surface oxidation: (1) adsorption of water on the glass surface as OH-, by exposure to air and (2), a concomitant reaction, i.e., oxidation with the glass, upon heating (chemisorption). Hereby, either oxygen of air or residual oxygen in Ar would react with the hydrogen of the -OH, liberating the oxygen for oxidation of iron. Heat treatment in vacuum of 10(-8) mbar does not result in any oxidation, and we assume that the adsorbed OH is exhausted from the glass surface. (c) 2005 Elsevier B.V. All rights reserved.
机译：为了评估富含Fe2 +的多组分硅酸盐玻璃的表面氧化，将天然玄武岩玻璃的粉末和碎片在Ar中进行热处理，然后通过Mossbauer光谱研究以监测Fe3 +的增加。玻璃碎片的氧化作用不会随时间或温度而增加，这表明玻璃与At之间的氧势不足以引起体积氧化。相反，玻璃粉末容易氧化到与空气中粉末氧化相当的程度，这表明表面氧化不取决于氧势。尽管在空气中进行了热处理，但在Ar中未检测到阳离子扩散到玻璃表面。因此，阳离子扩散不太可能参与氧化。我们提出以下用于表面氧化的机理：（1）通过暴露于空气中水以OH-的形式吸附在玻璃表面上，以及（2）伴随的反应，即加热（化学吸附）时玻璃氧化。因此，空气中的氧气或Ar中的残留氧气将与-OH的氢反应，释放出氧气以氧化铁。在10（-8）mbar的真空中进行热处理不会导致任何氧化，并且我们假设吸附的OH从玻璃表面排出。 （c）2005 Elsevier B.V.保留所有权利。

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