Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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The Properties of Optical Glass of B2O3-SiO2-La2O3 System with Li2O

Li2O가 포함된 B2O3-SiO2-La2O3계 광학 유리 특성

  • 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)
  • 이지선 (한국세라믹기술원 소재융합고도화본부 디스플레이소재센터) ;
  • 김세훈 (강릉원주대학교 세라믹신소재공학과) ;
  • 김진호 (한국세라믹기술원 소재융합고도화본부 디스플레이소재센터)
  • Received : 2022.10.20
  • Accepted : 2022.12.21
  • Published : 2022.12.27
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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

Acknowledgement

This work was supported by the Technology Innovation Program (20011325, High refractive optical glass for GMP) funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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