文献类型：期刊文献

英文题名：Dissolution mechanism of ZnO-MgO-P₂O₅ phosphate glasses

作者：Wang Zhong-Jian[1];Wu Wei[1];Jiang Bo[1];Hu Yi-Chen[1];Wang Shao-Bo[1]

机构：[1]E China Univ Sci & Technol, Dept Inorgan Mat, Shanghai 200237, Peoples R China

年份：2008

卷号：23

期号：1

起止页码：155

外文期刊名：JOURNAL OF INORGANIC MATERIALS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000252756900030)】；

语种：英文

外文关键词：phosphate glass; acid dissolution; hydrolyze reaction

摘要：The dissolution process of 40ZnO-10MgO-50P(2)O(5) glass in acid medium was studied by weight loss analysis. The result shows that the water dissolution rate of phosphate glasses doped with bivalent ions is low. However, situation changes greatly as the PH value of the solution reduces because of the ion exchange reaction between R2+ in glass and H+ in acid. The stability of glass network is thus destroyed and followed by hydrolysis reaction of phosphate structural group. The dissolution rate increases exponentially with the increase of temperature and the reaction activation energy decreases with the increase of pH value. The dissolution rate reaches the maximum in concentrated HCl due to the contribution of both H+ and H2O The mechanism of the dissolution process is proposed into two steps: first, the weight loss is proportional to the square root of the time, and the next, it is proportional to time, which indicates the formation and development of hydrate layer on the glass surface.