Study On Properties Of Lanthanide Multifunctional Glasses Prepared By Containerless Processing

Lanthanide glass has excellent optical properties such as high refractive index and high Abbe number,which can expand the field of view and reduce the volume of the device while maintaining the image quality.With the development of society,component design of glass to make it have special functionality is the future development direction of glass.Due to its non-contact characteristics,the aerodynamic levitation technology can effectively inhibit nucleation,make the melt reach deep cooling and prepare special glasses with better properties without adding glass forming materials.In this paper,the La₂O₃-Ga₂O₃-ZrO₂（LGZ）ternary system is selected for wide-spectrum transmission glass and the La₂O₃-Al₂O₃-ZrO₂（LAZ）ternary system is selected for the research of high-stability glass.The effect of ZrO₂ in the glass system is also the focus of the research.The study of LGZ ternary system find that the thermal stability and glass forming ability of glass increase first and then decrease with the increase of ZrO₂ content and reach the maximum when the ZrO₂ content is 10 mol%.Doping ZrO₂ can significantly improve the performance of the glass:the hardness,density and corrosion resistance of glass are all improved with the increase of ZrO₂ content.The hardness of the glass is increased by 8%,and the acid corrosion resistance is increased by 29 times.Raman tests of glasses show that after ZrO₂ is added to the glass network,free La³⁺ions and[Ga O_x]polyhedrons enter the glass network and improve the connectivity and compactness of the glass,thereby improving the properties of the glass.The maximum refractive index of glass reaches 1.976,and the maximum Abbe number reaches 49.9.The sample with a ZrO₂ content of 10mol%has a high refractive index of 1.949 and a high Abbe number of 48.3.Glass remains transparent in the ultraviolet to mid-infrared band,and the cut-off wavelengths are 284nm and 10.6μm respectively.Glass can maintain a high transmittance of more than 80%from the visible to the second infrared atmospheric window（3～5μm）.In the preparation of LAZ ternary system glass,it is found that there are two ceramicization paths in the glass.The thermal stability of glass decreases first and then increases with the increase of ZrO₂ content,while the glass forming ability first increases and then decreases.The turning point is when the ZrO₂ content is 10mol%.Using DSC test to analyze the crystallization kinetics of the glass,it is found that in the different components of the ternary system,the different crystallization modes of the glass lead to different ceramization paths,and the ZrO₂ content affects the thermal stability and glass forming ability of the glass by affecting the crystallization products.The hardness,density and corrosion resistance of glass are all improved with the increase of ZrO₂ content.The hardness of the glass is up to 8.2GPa,and the acid and alkali corrosion resistance of the glass has reached the best grade of commercially available glass.Raman tests indicate that[ZrO_x]polyhedrons replace[Al O_x]polyhedrons as connectors of glass network and improve the connectivity and compactness of the network by attracting free groups join the glass network,which is attributed to Zr⁴⁺ions high field strength and high coordination number.The refractive index of glass is increased from 1.77 to 1.89 while the Abbe number of glasses are always maintained above 32.Glasses remain transparent in the ultraviolet to mid-infrared band and have good optical properties.La₂O₃-Ga₂O₃-ZrO₂ ternary system wide-spectrum transmission glass and La₂O₃-Al₂O₃-ZrO₂ ternary system high-stability glass are systematically studied in this paper.Glass formation area,thermal properties,optical properties,hardness,corrosion resistance of glasses are tested,and the crystallization kinetics,structural changes of materials are analyzed through DSC,Raman and SEM.The functionalities of the two glasses show their broad application prospects in the field of optical devices.