Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Characteristics and Structural Evolution of Low-Silica Calcium Aluminate Glasses

소량의 $SiO_2$가 첨가된 Calcium Aluminate 유리의 특성 및 구조

  • Shim, Sung-Han (Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)) ;
  • Heo, Jong (Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)) ;
  • Kim, You-Song (Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH))
  • 심성헌 (포항공과대학교 재료금속공학과) ;
  • 허종 (포항공과대학교 재료금속공학과) ;
  • 김유성 (포항공과대학교 재료금속공학과)
  • Published : 1994.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

Current study was undertaken to explain the structural evolution and corresponding changes in the properties of calcium aluminate glasses with the variation of SiO2 doping concentration. Calcium aluminate glasses in the compositional ranges of (100-x)(0.6CaO+0.4Al2O3)+xSiO2(where x=0~60) were fabricated. DTA analysis confirmed an anomalous behavior in glass transition temperature (Tg) with the maximum of 887$^{\circ}C$ and minimum of 859$^{\circ}C$ when x=5 and 50, respectively. densities and refractive indices monotonically decreased with increasing SiO2 content and IR transmitting cutoff shifted to shorter wavelength side when the amount of added SiO2 exceeded 5 mole%. IR fundamental vibration absorption peaks showed the change that NBOs were inclined to SiO4 tetrahedron in the low-silica region and NBO per SiO4 tetrahedra changed from 2 to 0 with increasing silica content. Based on the analysis of IR fundamental vibration absorption peaks, the model of the structural change can be proposed in three step: 1) SiO4 scavenged the NBOs located at AlO4-tetrahedra, which resulted in the increased of Tg values, 2) NBOs located in the main network again with a decrease in Tg, and 3) dominated by the decrease in the relative amount of NBOs in the glass system, where Tg re-increased.

Keywords

References

  1. Mat. Sci. Reports v.2 Materials for Infrared Fibre Optics J A. Savage
  2. Infrared Fiber Optics P. Klocek;G.H. Sigel, Jr
  3. J Am. Ceram. Sci. v.75 no.9 Heavy Metal Oxide Glasses W.H. Dumbaugh;J.C Lapp
  4. J Non-Cryst Solids v.107 Calcium Aluminate Glasses as Potential Ultralow-Loss Optical Materials at 1.5~1.9 mm M.E. Lines;J.B. MacChesney;K.B. Lyons;A.J. Bruce;A.E. Miller;K. Nassau
  5. J. Non-cryst. Solids v.103 A Possibie Non-Halide Route to UltraLow Loss Glasses M.E. Lines
  6. Mater. Lett. v.11 Calcium Aluminate Glass Fibers: Drawing from Supercooled Melts Spinning F.T. Wallenberger;N.E. Weston;S.D. Brown
  7. J. Am. Ceram Sos v.53 Low-Silica Glasses Based on Calcium Aluminates G.Y. Onoda, Jr.;S.D. Brown
  8. J. Am. Ceram. Soc v.68 Dopant-Free Ultraviolet-Sensitive Calcium Aluminate Glasses H. Hosono;K. Yamazaki;Y. Abe
  9. J. Am. Ceram. Soc v.41 Optical and Physical Properties of Some Calcium Aluminate Glasses H.C. Hafner;N.J. Kreidl;R.A. Weidel
  10. J. Am. Ceram. Soc. v.68 Formation and Properties of Calcium Aluminosilicate Glasses J.E. Shelby
  11. J. Non-Cryst Solids v.126 Glass Formation and Thermal Properties of Low-Silica Calcium Aluminate Glassese P.L. Higby;R.J. Ginther;L.D. Aggarwal;E.J. Friebele
  12. J. Non-Cryst Solids v.136 $^{29}Si$ NMR and Infrared Reflectance Spectroscopy of Low-Silica Calcium Aluminosilicate Glasses C.I. Merzbacher;K.J. McGrath;P.L. Higby
  13. Phys. Chem. Glasses v.26 no.5 Structural Studies of Calcium Aluminosilicate Glasses by High Resolution Solid State $^{29}Si$ and $^{27}Al$ Masic Angel Spinning Nuclear Magnetic Resonance G. Engelhardt;M. Nofz;K. Forkel;F.G. Wihsmann;M. Magi;A. Samoson;E. Lippmaa
  14. Mat Sci. Forum v.19;20 Glass Forming Ability Criterion M. Saad;M. Poulain
  15. Chemistry of Glass W. Vogel
  16. J Non-Cryst. Solids v.130 An Electron Spin Resonance Study of X-Irradiated Calcium Aluminosilicate Glasses D.A. Dult;P.L. Higby;D.L. Griscom
  17. Inorganic Glass-Forming Systems H.L. Trap;J.M. Stevels
  18. J. Non-Cryst. Solids v.128 Structure and Properties of Calcium Aluminate Glasses C. Huang;E.C. Behrman
  19. J. Chem Phys v.75 no.7 Raman Spectroscopic Investigation of the Structure of Silicate Glasses. Ⅲ. Raman Intensities and Structural Units in Sodium Silicate Glasses T. Furukawa;K.E. Fox;W.B. White