微通道板铅硅酸盐玻璃表面纳米尺度的形貌(英文)

Nano-scale Morphology on Micro-channel Plate Lead Silicate Glass Surface

氢还原后微通道板铅硅酸盐玻璃表面的形貌与微通道板的使用性能直接相关。利用原子力显微镜研究了不同还原条件下的微通道板铅硅酸盐玻璃表面的纳米尺度形貌变化过程,并构建了还原过程中的表面微结构模型。结果表明:微通道板铅硅酸盐玻璃表面存在2种微结构形貌:一种是还原生成的新相颗粒弥散分布于玻璃基体中,还原条件影响弥散分布的颗粒尺寸与距离,还原初期容易出现小颗粒的弥散结构,而通过长时间还原或高温还原后则会出现大颗粒的弥散结构;另一种是新相颗粒相互连接形成连通结构。2种微结构形貌的形成取决于还原条件。经X射线衍射和X射线光电子能谱分析表明:铅硅酸盐玻璃表面的新相颗粒为玻璃中铅离子被还原生成的铅原子聚集体。

Hydrogen reduction is a key and final procedure to determine surface morphology of micro-channel plate lead silicate glass The surface morphology change can be correlated to the performance of micro-channel plate. The nano-scale morphology of micro-channel plate lead silicate glass surface treated under different reduction conditions was investigated by atomic force microscopy. A model to describe the morphology change was proposed. Results show that new granular phase occurred on the surface of lead silicate glass during reduction, and either diffused in bulk glass or integrated each other to form the connected structure. The formation of these two morphologies depended on the reduction conditions. As the diffusion morphology was concerned, the size of diffused granular and the granular distance were affected under the reduction conditions. In the initial reduction stage, the diffusion structure was formed by new granular phase with the smaller size. After the high temperature reduction, however, the diffusion structure of new granular phase with the larger size was distributed in bulk glass. The components of reduced and unreduced lead silicate glass surface were analyzed by X-ray diffraction and X-ray photoelectron spectroscopy. The results show that the new granular phase appearred on silicate glass surface should be an aggregate of Pb atom derived from the reduction of Pb2＋.