Preparation And Properties Of High Refractive Index Multicomponent Oxides Amorphous By Containerless Solidification

With the continuous development of optical technology,as the two most important performance indexes of optical components,people pay more and more attention to the research of refractive index and transmittance.High refractive index optical glass is widely used in national defense construction and national economy because of its bright color,wide field of vision and small size.In the comprehensive evaluation of an optical device,not only the refractive index value of a given wavelength,but also the wavelength dispersion of the refractive index in the range of visible light should be considered.The lower the dispersion of the optical device,the clearer the object can be seen in the field of vision.The dispersion degree of optical devices can be measured by Abbe coefficient:the larger the Abbe coefficient is,the lower the dispersion degree is.However,the refractive index is generally inversely proportional to the Abbe coefficient.Therefore,general optical devices can not have both high refraction and low dispersion properties.At present,commercial glass rarely achieves both high refraction and low dispersion properties.To solve the above problems,based on the concept of performance coordination in high entropy materials,a series of high entropy oxide amorphous materials are developed in this study,in order to ensure high refraction and low dispersion.The high entropy oxide amorphous of 20LaO3/2-20TiO2-20NbO5/2-20WO3-20ZrO2 was successfully prepared by using the new container free solidification technology.Among them,the non vessel solidification method improves the formation ability of amorphous,and the selected five oxides also have a certain gain in improving its optical performance.The width of supercooled liquid region ΔT=69℃ and the critical cooling rate is 24.9℃/s,from the point of view of kinetics,it can be concluded that the amorphous forming ability of the system is excellent;in terms of optical properties,its transmission window range is 0.354-7.28 μm.Due to the synergistic effect of high entropy "cocktail" effect,the system has both high refractive index(2.22)and high Abbe coefficient(61),which ensures that the lens can also obtain enough clarity in the case of ultra-thin.The above results show that the research on the optical properties of the system has a very broad prospect.In order to further explore the relationship between the synergistic effect and the proportion of high entropy components,based on the 25LaO3/2-25TiO2-25NbO5/2-25WO3 quaternary amorphous system,ZrO2 was used to replace La2O3,WO3,TiO2 and Nb2O5 in order of ion radius ratio.Then four kinds of non high entropy oxide glass systems are formed:La system,W system,Ti system and Nb system.For each system,the same performance characterization means are carried out.Among the non high entropy oxide glasses,W system x=5 system has the most outstanding optical properties.The system has the highest refractive index(2.53)and the highest visible transmittance(84%),which shows that it has great advantages in the application of optical components.In addition,the amorphous materials prepared by La2O3,TiO2,Nb2O5,WO3 and ZrO2 in this study are all high refractive index systems.It can be seen that the gain of the above components on the optical properties of glass is very significant,which can provide some reference for the future research on optical glass material selection.