Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Crystal Habits of Corundum Single Crystals Grown in Cryolite Flux

빙정식 융제로 성장한 Corundum 단결정의 결정형

  • 장진욱 (서울대학교 무기재료공학과) ;
  • 이태근 (서울대학교 무기재료공학과) ;
  • 정수진 (서울대학교 무기재료공학과)
  • Published : 1992.06.01
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Abstract

Corundum single crystals were grown in cryolite flux with the composition of Na3AlF6:Al2O3=80:20 wt%. This mixture was melted at 115$0^{\circ}C$, followed by slow cooling at a rate of 2$^{\circ}C$/hr to 96$0^{\circ}C$. And by adding of La2O3 to the flux, the change of crystal forms were observed. Crystal forms of corundum grown in cryolite flux had the habits of hexagonal plate which consist of well developed {0001} face and small {101} face. As La2O3 was added and its content was increased, {223} and {110} faces were developed, and crystal habits of equidimensional forms changed into hexagonal prism form. In a charge of 8 mole% B2O3, Al2O3:La2O3=15:1, transparent corundum single crystals of equent form were grown. As the content of B2O3 was increased, twineed crystals which have twin law of 2-fold parallel to [0001], and composition plane of (110) were grown.

Keywords

References

  1. Optical Materials S. Musikant
  2. Epitaxial Silicon Technology P.K. Vasudev;B.J. Baliga(ed.)
  3. Advanced Crystal Growth PM Dryburgh;P.M. Dryburgh(ed.,et al.)
  4. Solid-State Laser Engineering W. Koechner
  5. Nature(London) v.191 A New Technique for the Production of Synthetic Corundum D.A.D. White
  6. J. Appl. Phys. v.35 Laser Action in Flux-Grown Ruby D.F. Nelson(et al.)
  7. J. Am. Ceram. Soc. v.49 Habit Modification of Corundum Crystals Grown Molten PbF₂-Bi₂O₃ A.B. Chase
  8. Sov-Phys. Cryst. v.12 Solublity and Conditions of Growth of Corundum from Molten Fluxes V.A. Timofeeva(et al.)
  9. J. Am. Ceram. Soc. v.53 Habit Changes of Sappire Grown from PbO-PbF₂ and MoO₃-PbF₂ Fluxes A.B. Chase(et al.)
  10. J. Am. Ceram. Soc. v.50 no.58 Growth of Large Sapphire Crystals from Cryolite R.H. Arlett(et al.)
  11. J. Cryst. Growth v.24/25 Growth of Corundum Single Crystals from Molten Cryolite(Na₃$AlF_6$) K. Watanabe(et al.)
  12. J. Am. Ceram. Soc. v.43 Determination of the Cryolite-Alumina Phase Diagram by Quenching Methods P.A. Foster, JR.
  13. Crystal Growth from High Temperature Solutions D. Elwell;HJ. Scheel
  14. J. Cryst. Growth v.54 Growth of Corundum Single Crystals by Seed Rotating Method K. Watanabe(et al.)
  15. Crystal Growth from High Temperature Solutions DD. Elwell;HJ. Scheel
  16. The Growth of Crystals from Liquids J.C. Brice
  17. Current Topics in Materials Science v.10 I. Sunagawa;E. Kaldis(ed.)
  18. Crystal Growth from High Temperature Solutions D. Elwell;HJ. Scheel
  19. Crystal Growth from High Temperature Solutions D. Elwell;HJ. Scheel
  20. J. Cryst. Growth v.32 Relationship between Habit and Etch Figures of Corundum Crystals Grown from Molten Cryolite Flux K. Watanabe(et al.)