Localised extended ("vermiform") features formed during glass dissolution
Localised extended ("vermiform") features formed during glass dissolution
复制标题
玻璃溶解过程中形成的局部扩展（“蠕虫状”）特征
DOI：
10.1016/j.jnoncrysol.2023.122230
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发表时间：
2023
影响因子：
3.5
通讯作者：
Mansfield J
中科院分区：
文献类型：
--
作者：
Mansfield J
玻璃耐久性的研究是很重要的，我们的玻璃化核废料，天然和考古玻璃的可能长期行为的理解，但是，很少有系统的方式报告的功能与局部化学攻击等玻璃。在90 °C下在水中对5种不同组合物的玻璃整料进行28天至672天的耐久性实验：3种玄武岩组合物; 25重量%负载的英国混合物Windscale（MW 25）玻璃和国际简单玻璃（ISG）的非活性版本都产生局部延伸或蠕虫状蚀变特征。在研究的所有溶解时间，在所有玻璃上观察到类似的特征。特征的数量以及它们是否被改造产品填充取决于玻璃成分。大多数特征具有相当简单的几何形状，但可以看到较少数量的更复杂的形态。这些特征的位置被认为最有可能与整料生产产生的残余损坏有关，从而为局部加速溶解提供场所。尽管是局部加速溶解的部位，但经计算，这些特征对总表面积的影响有限。因此，用于计算标准化质量损失和标准化损失率的表面积项不会因这些特征而产生很大误差。
Studies on glass durability are important to our understanding of the likely long term behaviour of vitrified nuclear wastes, natural and archaeological glasses; there has, however, been little in the way of systematic reporting of features associated with localised chemical attack on such glasses. Durability experiments performed in water at 90 °C from 28 d to 672 d on glass monoliths of 5 different compositions: 3 basaltic compositions; an inactive version of the 25 wt% loaded UK mixture Windscale (MW25) glass and the International Simple Glass (ISG) all yielded locally extended or vermiform alteration features. Similar features are seen on all glasses at all dissolution times studied. The number of features and whether they were filled by alteration products or not was dependant on glass composition. The majority of features have quite simple geometries but lesser numbers of more complex morphologies are seen. The location of these features is thought to be most probably linked to residual damage arising from the monolith production providing sites for locally accelerated dissolution. Despite being sites of localised accelerated dissolution the impact of these features on the total surface area is calculated to be limited. Hence the surface area term used to calculate normalised mass losses and normalised loss rates will not be greatly in error as a result of these features.