Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation of Crystalline TiO$_2$ Ultafine Powders form Aqueous TiCl$_4$ Solution by Precipitation Method

TiCl$_4$ 수용액에서 침전법에 의한 결정상 TiO$_2$ 초미분체 제조

  • Kim, Sun-Jae (Advanced Nuclear Materials Development Team, Korea Atomic Energy Research Institute) ;
  • Jung, Choong-Hwan (Advanced Nuclear Materials Development Team, Korea Atomic Energy Research Institute) ;
  • Park, Soon-Dong (Advanced Nuclear Materials Development Team, Korea Atomic Energy Research Institute) ;
  • Kwon, Sang-Chul (Advanced Nuclear Materials Development Team, Korea Atomic Energy Research Institute) ;
  • Park, Sung (Dept. of Inorganic Materials Eng., Myongji Univ)
  • 김선재 (한국원자력연구소 원자력재료기술개발팀) ;
  • 정충환 (한국원자력연구소 원자력재료기술개발팀) ;
  • 박순동 (한국원자력연구소 원자력재료기술개발팀) ;
  • 권상철 (한국원자력연구소 원자력재료기술개발팀) ;
  • 박성 (명지대학교 무기재료공학과)
  • Published : 1998.04.01
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Abstract

Crystalline TiO2 ultrafine powders were prepared simply by heating and stirring aqueous TiOCl2 solution with {{{{ {Ti }^{4+ } }} concentration of 0.5 M from room temperature to 10$0^{\circ}C$ under 1 atmoshpere. The crystallinity and the particle shape of TiO2 ultrafine powders obtained by simple precipitation method were analyzed us-ing XRD(X-ray diffractometer). SEM(scanning electron microscopy) and TEM(transmission electron mi-croscopy) TiO2 crystalline precipitate with rutile phases is fully formed at the temperatures of up to $65^{\circ}C$ and then TiO2 crystalline precipitate with anatase phase starts to be formed above temperatures $65^{\circ}C$ showing its full formation at 10$0^{\circ}C$ These behaviors of TiO2 crystalline precipitate directly from an aqueous TiOCl2 solution would be caused due to the existence of {{{{ OMICRON ^2+ }} ions from distilled water which oxydize TiOCl2 to TiO2 not hydrolyzing it to Ti(OH)4 Here thermodynamically stable TiO2 rutile phase generally formed at higher temperature is practically precipitated at lower temperatures in this study This may be due to the precipitation by very slow reaction enough to make TiO2 particles allocated into stable rutile structure.

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References

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