Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Formation of Layered Bi5Ti3FeO15 Perovskite in Bi2O3-TiO2-Fe2O3 Containing System

  • Borse, Pramod H. (Center for Nanomaterials, International Advanced Research Center for Powder Metallurgy and New Materials (ARC International),Department of Chemical Engineering, Pohang University of Science and Technology) ;
  • Yoon, Sang-Su (Department of Chemistry (BK21), Pusan National University) ;
  • Jang, Jum-Suk (Department of Chemical Engineering, Pohang University of Science and Technology) ;
  • Lee, Jae-Sung (Department of Chemical Engineering, Pohang University of Science and Technology) ;
  • Hong, Tae-Eun (Busan Center, Korea Basic Science Institute) ;
  • Jeong, Euh-Duck (Busan Center, Korea Basic Science Institute) ;
  • Won, Mi-Sook (Busan Center, Korea Basic Science Institute) ;
  • Jung, Ok-Sang (Department of Chemistry (BK21), Pusan National University) ;
  • Shim, Yoon-Bo (Department of Chemistry (BK21), Pusan National University) ;
  • Kim, Hyun-Gyu (Busan Center, Korea Basic Science Institute)
  • Published : 2009.12.20
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Abstract

Structural and thermo-analytical studies were carried out to understand the phase formation kinetics of the single phase $Bi_5Ti_3FeO_{15}$ (BTFO) nanocrystals in $Bi_2O_3-Fe_2O_3-TiO_2$, during the polymerized complex (PC) synthesis method. The crystallization of Aurivillius phase $Bi_5Ti_3FeO_{15}$ layered perovskite was found to be initiated and achieved under the temperature conditions in the range of ${\sim}$800 to 1050$^{\circ}C$. The activation energy for grain growth of $Bi_5Ti_3FeO_{15}$ nanocrystals (NCs) was very low in case of NCs formed by PC (2.61 kJ/mol) than that formed by the solid state reaction (SSR) method (10.9 kJ/mol). The energy involved in the phase transformation of Aurivillius phase $Bi_5Ti_3FeO_{15}$ from $Bi_2O_3-Fe_2O_3-TiO_2$ system was ${\sim}$ 69.8 kJ/mol. The formation kinetics study of $Bi_5Ti_3FeO_{15}$ synthesized by SSR and PC methods would not only render a large impact in the nanocrystalline material development but also in achieving highly efficient visible photocatalysts.

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