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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 >The effect of changes in relative humidity on the hydration rate of Pachuca obsidian
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The effect of changes in relative humidity on the hydration rate of Pachuca obsidian

机译：相对湿度变化对黑曜石水化速率的影响

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摘要

The effect of relative humidity on the hydration rate of obsidian and other glasses has been debated since the early work of [I. Friedman, R. Smith, Am. Antiquity 25 (1960) 476]. While more recent work has been in general agreement that a relative humidity dependence does exist, hydration profiles as a function of relative humidity have not been obtained. In this paper we present the results of a study in which samples of Pachuca obsidian were hydrated for approximately 5 days at 150 degrees C at relative humidities ranging from 21% to 100%, and the resultant profiles were measured by secondary ion mass spectrometry (SIMS). The results suggest that the hydration rate is, indeed, a function of relative humidity, but for the relative humidity levels commonly observed in most soils the effects on hydration dating are expected to be relatively small. In addition, analysis of the surface values as sorption isotherms and comparisons with nitrogen sorption isotherms suggests that water is relatively strongly bound to the obsidian surface. By assuming a situation in which the 'surface' refers to active centers within the glass we have shown that an adsorption model provides a useful approach to modeling the diffusive process. (c) 2006 Elsevier B.V. All rights reserved.
机译：自从[I．弗里德曼，R。史密斯，美国古代25（1960）476]。尽管最近的工作普遍达成共识，即确实存在相对湿度依赖性，但尚未获得作为相对湿度函数的水合曲线。在本文中，我们介绍了一项研究的结果，其中，南美白桦（Pachuca obsidian）样品在150摄氏度，相对湿度21％至100％的条件下被水合约5天，并通过二次离子质谱（SIMS）测量得到的剖面）。结果表明，水合速率确实是相对湿度的函数，但是对于大多数土壤中通常观察到的相对湿度水平，预计对水合年代的影响相对较小。另外，对作为吸附等温线的表面值的分析以及与氮吸附等温线的比较表明，水相对牢固地结合到黑曜石表面。通过假设“表面”是指玻璃内的活性中心的情况，我们已经表明，吸附模型提供了一种对扩散过程进行建模的有用方法。 （c）2006 Elsevier B.V.保留所有权利。

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