Glass-forming ability of high refractive index amorphous materials prepared by -TiO2 and Nb2O5

作者：Li, Ying; Yang, Guangjun; Mao, Aihua; Qi, Xiwei^*; Bai, Yang

来源：Journal of Non-Crystalline Solids, 2022, 575: 121185.

DOI：10.1016/j.jnoncrysol.2021.121185

• LaGaO3-TiO2-Nb2O5 amorphous spheres
• CCT diagrams
• GFA
• Critical cooling rate
• High refractive index

By using a laser pneumatic suspension furnace, a series of transparent 0.3LaGaO(3)-(0.7 -x)TiO2-xNb(2)O(5) amorphous spheres with diameters of approximately 2-4 mm can be obtained with an x-value between 0 and 0.65. An approximate value for the critical cooling rate was obtained using CCT diagrams. The four criterions of GFA (glass forming ability) were discussed in terms of the R-2 value; the higher the R-2 value, the better the linear relationship between GFA and the critical cooling rate. The maximum value of R-2 was obtained for the Rc-Delta T (Rc is defined as the critical cooling rate) plot. The Delta T was chosen as a GFA criterion to evaluate the GFA of LaGaO3- TiO2, LaGaO3-Nb2O5 and LaAlO3-Nb2O5 amorphous spheres. The GFA of four series of highly-refractive amorphous spheres prepared by TiO2 and Nb2O5 are also discussed. The maximum transmittances of 0.3LaGaO(3)-(0.7 -x)TiO2-xNb(2)O(5) amorphous samples, where x = 0.1, 0.2 and 0.3, were approximately 78%, 76% and 75% respectively. The refractive index nd of the amorphous samples were all higher than 2.2.

• 单位
  东北大学; 辽宁工程技术大学; 中国科学技术大学; 内蒙古科技大学