Molecular-like Structural Units Of Oxides In Glass And Preparation Of Al₂O₃ Composite High Aluminum Films

Oxide glass is one of the most widely used systems among many glass systems,and its applications cover all aspects of people's daily lives.The main components of oxide glass are Si O₂ and other oxides,such as sodium silicate,calcium silicate,alumina,etc.The composition of the glass that people use every day is very complicated.Due to the lack of a method to accurately describe the structure of the glass composition,it is impossible to recognize the structural carrier behind the composition and to establish the relationship between the composition,structure and performance.A lot of experimental exploration to improve the glass performance.Through establishing a method that can accurately describe the structure of the glass will help us understand the structural roots of the glass composition and help people solve the problem of the design of the oxide glass composition.In this paper,the cluster-plus-glue-atom model and the molecule-like structural unit concept,based on the concept of the first nearest neighbor polyhedra,are introduced to analyze silicate-glass-relevant oxide structures.It is verified that the clusters of the oxides in the glass system are mainly in the form of triangles,tetrahedrons,cubes,and octahedrons,on which three-dimensional glassy network is constructed.The 16 kinds of oxide molecular structural units established in this paper,without exception,all meeting the eight-electron rule and can be regarded as the smallest molecular units of the various oxides in glasses.In addition,in this paper,Al₂O₃ composite high-aluminum glass film was prepared by using magnetron sputtering method and using high-aluminum glass and Al₂O₃ as targets.Scanning electron microscope?SEM?,X-ray diffraction?XRD?,Fourier transform infrared analysis?FTIR?and X-ray photoelectron spectroscopy?XPS?were used to analyze the surface morphology,structure and composition of the film.The results show that when the Al₂O₃ target power is 120 W and other conditions remain unchanged,the prepared film has the best comprehensive performance.In addition,the hardness and visible light transmittance of the film were tested.The test results show that the nanohardness of the film can reach more than 18 GPa,while maintaining a good visible light transmittance higher than 85%.