Dissolution Mechanism of ZnO-MgO-P2O5 Phosphate Glasses
Source abstract
Abstract
采用表面失重法分析40ZnO-10MgO-50P2O5玻璃在酸性溶液中的溶解过程.实验结果表明:含二价金属阳离子的磷酸盐玻璃在水中溶解速度缓慢,但在酸性溶液中,因R^2+和H^+离子交换加速,破坏了结构的稳定性,磷氧基团很容易发生水解,在pH〈3时,玻璃的溶解速率会急剧增大.溶解速率随温度升高呈现指数增加的趋势,溶解活化能随pH值的升高而降低;在高浓度盐酸溶液中,溶解速率随浓度变化出现极值,这一切均应归于H^+和H2O活度的双重作用;通过对失重曲线变化的研究发现:玻璃的溶解过程分为两个阶段,第一阶段失重量与时间平方根成正比,第二阶段失重量与时间成正比,说明玻璃表面的水化层经历了形成、发展和稳定的过程.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Glass properties and applications · Aerogels and thermal insulation · Pigment Synthesis and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (10)
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