微观结构
材料科学
硅化物
硅
无定形固体
氮化硅
氧化物
透射电子显微镜
扫描电子显微镜
杂质
化学工程
分析化学(期刊)
冶金
矿物学
复合材料
结晶学
纳米技术
化学
有机化学
色谱法
工程类
作者
Abbas Saeed Hakeem,Sharafat Ali,Thomas Höche,Q.A. Drmosh,Amir Azam Khan,Bo Jonson
出处
期刊:Nanomaterials
[Multidisciplinary Digital Publishing Institute]
日期:2021-07-23
卷期号:11 (8): 1896-1896
被引量:2
摘要
Oxynitride glasses are not yet commercialised primarily due to the impurities present in the network of these glasses. In this work, we investigated the microstructure and instinctive defects in nitrogen rich La−Si−O−N glasses. Glasses were prepared by heating a powder mixture of pure La metal, Si3N4, and SiO2 in a nitrogen atmosphere at 1650–1800 °C. The microstructure and impurities in the glasses were examined by optical microscopy, scanning electron microscopy, atomic force microscopy, and transmission electron microscopy in conjunction with electron energy-loss spectroscopy. Analyses showed that the glasses contain a small amount of spherical metal silicide particles, mostly amorphous or poorly crystalline, and having sizes typically ranging from 1 µm and less. The amount of silicide was estimated to be less than 2 vol. %. There was no systematic relation between silicide formation and glass composition or preparation temperature. The microstructure examination revealed that the opacity of these nitrogen rich glasses is due to the elemental Si arise from the decomposition reaction of silicon nitride and silicon oxide, at a high temperature above ~1600 °C and from the metallic silicide particles formed by the reduction of silicon oxide and silicon nitride at an early stage of reaction to form a silicide intermetallic with the La metal.
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