Acta Chimica Sinica ›› 2001, Vol. 59 ›› Issue (4): 566-570. Previous Articles     Next Articles

Original Articles

M,W型六角钡铁氧体化学键性质和穆斯堡尔谱位移研究

高发明;李东春   

  1. 燕山大学材料化工学院
  • 出版日期:2001-04-15 发布日期:2001-04-15

Investigation of chemical bond properties and mossbauer isomer shifts in M-,W-type hexagonal barium ferrites

Gao Faming;Li Dongchun   

  • Online:2001-04-15 Published:2001-04-15

By using the average band-gap model, chemical bond properties of M-, W-type hexagonal barium ferrites have been studied. Mossbauer isomer shifts of^57 Fe in BaFe12O19 and BaFe18O27 are calculated by using the chemical surrounding factor, h, definited bycovalency and electronic polarizability. The calculation results of the Mossbauer isomer shifts in various crystallographic positions are in agreement with their experimental values. It is verified that the Fe^2+ ions exist in 4f3, site of W- type hexagonal barium ferrite. Special attention is given to the anisotropy of the bond susceptibilities of^57 Fe nuclei in 2b position. This theoretical method allows us to calculate accurately the bond structure and the isomer shifts of complex hexagonal ferrites.

Key words: FERRITE, CHEMICAL BONDS, MOSSBAUER SPECTROMETRY

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