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 °C 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 °C to 564 °C. 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.

Abstract
1. 서 론
2. 실험 방법
3. 결과 및 고찰
    3.1. 모유리의 광학적 특성
    3.2. 광학유리의 굴절률 특성
    3.3. 광학유리의 물리적 특성
    3.4. 광학유리의 열적 특성
    3.5. 광학유리의 기계적 특성 분석
4. 결 론
Acknowledgement
References

• 이지선(한국세라믹기술원 소재융합고도화본부 디스플레이소재센터) | Ji-Sun Lee (Display Materials Center, Advanced Materials Convergence R&D Division, Korea Institute of Ceramic Engineering & Technology)
• 김세훈(강릉원주대학교 세라믹신소재공학과) | Sae-Hoon Kim (Department of Ceramic Engineering, Gangneung Wonju National University)
• 김진호(한국세라믹기술원 소재융합고도화본부 디스플레이소재센터) | Jinho Kim (Display Materials Center, Advanced Materials Convergence R&D Division, Korea Institute of Ceramic Engineering & Technology) Corresponding author