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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 >Changes in surface morphology of silicate glass induced by fast electron irradiation
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Changes in surface morphology of silicate glass induced by fast electron irradiation

机译：快速电子辐照引起硅酸盐玻璃表面形态的变化

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摘要

Binary potassium-silicate glass was irradiated with a defocused electron beam. During the irradiation the alkali ions migrate from the surface into the depth and alkali ions depleted layer is created near the surface. Such changes in the chemical composition are also accompanied with changes of the glass structure and finally result in the volume changes of the irradiated glass. This was directly studied using atomic force microscope (AFM). A series of exposures with energy of electrons of 7–50 keV and with different doses were performed. For low doses the irradiated glass is continuously depressed with the increasing dose, indicating this way the structural changes leading to the volume compaction. It is suggested the compaction is caused by the relaxation processes of the silica subnetwork. A further increase of the electron dose causes a formation of the small bump inside the center of the depression. The bump arises with the dose and finally exceeds the surrounding surface. It is suggested that the expansion is connected with the migration of alkali ions and the formation of Si–O–O–Si bonds which result in the formation of new rings with new space requirements.
机译：用离焦电子束照射二元硅酸钾玻璃。在照射期间，碱金属离子从表面迁移到深度，并且在表面附近形成了碱金属离子耗尽层。化学成分的这种变化还伴随着玻璃结构的变化，并最终导致被照射的玻璃的体积变化。这是使用原子力显微镜（AFM）直接研究的。用7–50 keV电子能量和不同剂量进行了一系列曝光。对于低剂量，随着剂量的增加，辐照玻璃不断被压下，表明这种方式的结构变化导致体积紧实。建议压实是由二氧化硅子网的松弛过程引起的。电子剂量的进一步增加导致在凹陷的中心内部形成小凸起。隆起随着剂量而产生并且最终超过周围表面。有人认为，膨胀与碱金属离子的迁移以及Si–O–O–Si键的形成有关，这会导致形成具有新空间要求的新环。

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