Articles
  • Structure of hercynite prepared with existence of metal Fe 
  • Junhong Chena,*, Dongfang Liub, Mingwei Yana, Jindong Sua, Bin Lia and Jialin Suna
  • a School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China b Department of Materials Science and Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Abstract
In this work, raw materials analytically pure Al2O3 and analytically pure Fe2O3 were mixed in FeO: Al2O3 molar ratio of 1 : 1and pressed into specimens. The specimens were embedded in analytically pure metal Fe powders and fired slowly to 1650 oCin air atmosphere, and then soaked at 1650 oC for 5 hrs. The fired specimens were investigated by XRD, SEM, and EDS. Theresults show that the specimen synthesized at high temperatures in melting Fe is composed of hercynite and wüstite (FenO(n ≤ 1)); FenO disperses in hercynite; hercynite crystals develop well and are mostly perfect octahedron with grain size around50μm. The hercynite has Fe/Al ratio smaller than 1/2, which is non-stoichimetric. With the existence of melting Fe, althoughthe raw materials are theoretically batched according to FeO·Al2O3, FenO is still excess, so the hercynite obtained is Al-rich.

Keywords: Melting Fe surrounding, Hercynite, Wüstite, Non-stoichiometric

This Article

  • 2016; 17(12): 1226-1229

    Published on Dec 31, 2016