Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Exsolution of $Bi_4Ge_3O_12$ in $Bi_12GeO_20$ Crystals Grown by Pulling Method

인상 육성한 $Bi_12GeO_20$ 결정내의 $Bi_4Ge_3O_12$석출상

  • 이태근 (서울대학교 공과대학 무기재료공학과) ;
  • 정수진 (서울대학교 공과대학 무기재료공학과)
  • Published : 1991.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

Various crystal defects such as voids, inclusions dislocations, stacking faults and precipitates were observed in the Czochralski-grown Bi12GeO20 crystals. Particularly, precipitates were found in the whole crystals. The phase of these precipitates was identified as Bi4Ge3O12 by EPMA and transmission electron microscopy. The precipitates were produced by pulling rapidly from a non-stoichiometric charge. During the pulling of Bi12GeO20 crystals, the melt composition of stoichiometric charge was changed Bi-deficent with gradual volatilization of Bi2O3. Precipition of the second phase may have been affected by an abrube thermal stress. By adding excess Bi2O3 into the stoichiometric batch, the precipitation of Bi4Ge3O12 was suppressed. At a pulling speed of 2 mm/hr, clear and precipitate from crystals of Bi12GeO20 were grown from the melt of the Bi2O3 excess charge.

Keywords

References

  1. J. Chem. Phys. v.71 no.2 Crystal Structure and Absolute Piezoelectric $d_{11}$ Coefficient in Laevorotory $Bi_{12}SiO_{20}$ S.C. Abrahams;J.C. Bernstein;C. Svensson
  2. Opt Eng. v.17 no.4 The PROM-Theory and Applications for the Pockels Readout Optical Modulator B.A. Horwitz;F.J. Corbett
  3. IEEE. Trans. Sonics Ultrasonics v.SU-21 Electromechanical Properties of Bismuth Silicon Oxide $(Bi_{12}SiO{20})$ H. Schweppe;P. Quadfheg
  4. J. Cryst. Growth v.48 New Polar Materials Their Application of SAW and Other Devices R.W. Whatmore
  5. Neorga Mater. v.17 no.8 Growth of Enantiomorphic Crystals Having the Sillenite Structure Yu.F. Kargin;A.V. Marin;A.Ya. Vasilev;V.I. Chmyrev;V.M. SkoriKov
  6. Laser 硏究 v.9 no.3 Growth Method of BSO Single Crystals K. Miyamoto;H. Miyamoto;S. Komoda
  7. J. Cryst. Growth v.75 Thermal Analysis of Bismuth Germanate Compound G. Cosmit;M.A. Van Driel;R.J. Elsenaan;W.V. De Guchte;A.M. Hoogenboom;J.C. Sens
  8. Mat. Res. Bull. v.7 Czochralski Synthesis and Properties of Rare-Earth-Doped Bismuth Germanate S.K. Dickinson;R.M. Hiton;H.J. Lipson
  9. Neorga. Mat v.13 no.1 Properties of Metls in the System Bi₂O₃-GeO₂ Yu. F. Kargin;V.P. Zherb;V.M. Skorikov;A.V. Kosov;V.A. Kutvitskii;E.Z. Nuriev
  10. J. Cryst. Growth v.69 The Influence of Impurities on the Quality of Bismuth Germante (BGO) Scintilator R.G.C. Barnes
  11. J. Cryst. Growth v.78 The Nature of Imperfections in Bismuth Germanate (BGO) Crystals S. Horowitz;G. Krammer
  12. Philips tech. Rev. v.37 no.9;10 Pulling Large Bismuth-Silicon-Oxide Crystals J.G. Brice;M.J. Hight;O.F. Hill;P.A.C. Whiffin
  13. J. Crystal. Growth v.24;25 The Czochralski Growth of $Bi_{12}SiO_{20}$ Crystals J.C. Brice;T.M. Bruton;O.F. Hill;P.A.C. Whiffin
  14. International Tables for Crystallography T. Hahn
  15. J. Chem. Soc. Japan v.10 Crystal Growth and Optical Properties of Large Single-Crystals of Bismuth Silicon Oxide K. Tada;H. Nanba;Y. Kuhara;M. Tatsumi;S. Iguchi;Y. Hamasaki;Y. Nishiwaki;K. Tsuno
  16. Electron Microscopy in Mineralogy H.R. Wenk
  17. Crystal Growth 2 DJJ. Hurle