한국결정성장학회지 (Journal of the Korean Crystal Growth and Crystal Technology)

  • 제7권2호
  • /
  • Pages.259-270
  • /
  • 1997
  • /
  • 1225-1429(pISSN)
  • /
  • 2234-5078(eISSN)
한국결정성장학회 (The Korea Association of Crystal Growth)
권호 표지

비정질 $TiO_2$와 $\alpha-AL_2O_3$부터 $AL_2TiO_5$를 합성하기 위한 고체상태 반응속도

Solid-state reaction kinetics for the formation of aluminium titanate ($AL_2TiO_5$) from amorphous $TiO_2$ and $\alpha-AL_2O_3$

  • Ik Jin Kim (Institute for Processing and Application of Inorganic Materials, PAIM, Dept. of Material Science and Engineering, Hanseo University) ;
  • Oh Seong Kweon (Institute for Processing and Application of Inorganic Materials, PAIM, Dept. of Material Science and Engineering, Hanseo University) ;
  • Young Shin Ko (Department of Science Education, Seoul National University of Eduction) ;
  • Constantin Zografou (Institute for Processing and Application of Inorganic Materials, PAIM, Dept. of Material Science and Engineering, Hanseo University)
  • 발행 : 1997.05.01
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초록

$\alpha-Al_2O_3$와 비정질 $TiO_2$부터 $Al_2TiO_5$를 합성하기 위한 고체상태반응의 반응속도를 $1200~1300^{\circ}C$ 온도 범위에서 연구하였다. 반응속도는 $Al_2O_3$분말을 코팅한 50 mol%의. $TiO_2$와 일정한 온도에서 여러 시간동안 가열하여 생성된 혼합물에 의하여 결정되었다. MgO안의 반응물과 미반응물의 양은 X-선 회절분석에 의하여 결정되었다. $Al_2TiO_5$의 부피율과 peak intensity비의 자료로부터 $Al_2O_3$와 $TiO_2$의 pseudobrookite(Tialite)형태로의 반응은 $1280^{\circ}C$와 $1300^{\circ}C$ 사이에서 시작되었다. 고체상태반응 활성화 에너지는 Arrhenius식에 의하여 결정되었다. 활성화 에너지는 622.4 kJ/mol이다.

Reaction kinetics for the solid-state reaction of $\alpha-Al_2O_3$ with amorphous $TiO_2$ to produce $Al_2TiO_5$ (Tialite) was studied in the temperature range of $1200~1300^{\circ}C$. Rate of kinetic reaction were determined by using $TiO_2$-coated $Al_2O_3$ compact containing 50 mol% $TiO_2$ and heating the reactant mixtures in MgO at definite temperature for various times. Amount of products and unreacted reactants were determined by X-ray diffractometry. Data from the volume fraction and ratio of peak intensities of $\beta-Al_2TiO_5$ indicated that the reaction of $\alpha-Al_2O_3$ with $TiO_2$ to form pseudobrookite starts between 1280 and $1300^{\circ}C$. The activation energy for solid-state reaction was determined by using the Arrhenius equation ; The activation energy was 622.4 kJ/mol.

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