Mechanism of Phase Transformation and Formation of Barium Hexafer rite Doped with Rare-Earths in Sol-Gel Process  

作　　者：甘树才 洪广言 张军 车平 唐娟 

机构地区：[1]College of Chemistry Jilin University [2]Changchun Institute of Applied Chemistry Chinese Academy of Sciences

出　　处：《Journal of Rare Earths》2003年第1期98-100,共3页稀土学报（英文版）

基　　金：ProjectsupportedbytheNaturalScienceFoundationofJilinProvinceofChina ( 2 0 0 0 0 5 12 -2 )

摘　　要：The phase-transformation in sol-gel preparation of barium hexaferrite and the formation of barium hexaferrite doped with La 3+ were studied by chemical p hase analysis, X-ray diffraction and infrared spectrometry analysis. The expe rimental results show that phase transformation reactions of FeCO 3, Fe 2O 3 and BaFe 2O 4, barium hexaferrite and γ-Fe 2O 3 take place in the heat tr eatment of gel. While the doping lanthanide ion replace barium ion, an equivalen t quantity of Fe 3+ are reduced to Fe 2+ to maintain the charge equili brium.The phase-transformation in sol-gel preparation of barium hexaferrite and the formation of barium hexaferrite doped with La 3+ were studied by chemical p hase analysis, X-ray diffraction and infrared spectrometry analysis. The expe rimental results show that phase transformation reactions of FeCO 3, Fe 2O 3 and BaFe 2O 4, barium hexaferrite and γ-Fe 2O 3 take place in the heat tr eatment of gel. While the doping lanthanide ion replace barium ion, an equivalen t quantity of Fe 3+ are reduced to Fe 2+ to maintain the charge equili brium.

关 键 词：chemical materials barium hexafettite doped  rare earths sol-gel process phase transformation MECHANISM 

分 类 号：O648[理学—物理化学]