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http://dx.doi.org/10.3740/MRSK.2022.32.12.560

The Properties of Optical Glass of B2O3-SiO2-La2O3 System with Li2O  

Ji-Sun Lee (Display Materials Center, Advanced Materials Convergence R&D Division, Korea Institute of Ceramic Engineering & Technology)
Sae-Hoon Kim (Department of Ceramic Engineering, Gangneung Wonju National University)
Jinho Kim (Display Materials Center, Advanced Materials Convergence R&D Division, Korea Institute of Ceramic Engineering & Technology)
Publication Information
Korean Journal of Materials Research / v.32, no.12, 2022 , pp. 560-564 More about this Journal
Abstract
In this study, lanthanum boron silicate glasses were prepared with a composition of x Li2O-(60-x)B2O3-5CaO-5BaO-7ZnO-10SiO2-10La2O3-3Y2O3 where x = 1,3,5,7, and 9 mol%. Each composition was melted in a platinum crucible under atmospheric conditions at 1,400 ℃ for 2 h. Clear glasses with a transmittance exceeding 85 % were fabricated. Their optical, thermal, and physical properties, such as refractive index, Abbe number, density, glass transition (Tg) and Knoop hardness were studied. The results demonstrated that refractive index was between 1.6859 and 1.6953 at 589.3 nm. The Abbe number was calculated using an equation for 589.3 nm (nd), 656.3 nm (nf) and 486.1 nm (nc) and was observed to be in the range from 57.5 to 62.6. As the Li2O content increased, the glass transition temperature of the optical glass decreased from 608 ℃ to 564 ℃. If glass mold pressing is performed using a material with a low transition temperature and high mechanical strength, then the optical glasses developed in this study can be completely commercialized.
Keywords
optical glass; glass transition temperature; glass reflective index; abbe number; Knoop hardness;
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