论文部分内容阅读
使用XRD、Mossbauer谱及化学组成分析考察了氧缺位铁酸盐MFe2O4-δ(δ>0,M=Fe,Co,Mn,Ni)的晶格常数、磁性、稳定性及还原性.结果表明,氧缺位铁酸盐MFe2O4-δ(δ>0)的晶格常数比MFe2O4+δ(δ≥0)的大,Mossbauer谱内磁场却更小.MFe2O4-δ(δ>0)随着氧缺位程度δ的增大,晶格常数增大,内磁场减小.MFe2O4-δ在室温下空气中是不稳定的,只能在惰性气体中低温(<673K)下稳定存在.MFe2O4-δ具有较强的还原能力,在573K下能将CO2还原成C.
The lattice constants, magnetism, stability and reducibility of oxygen vacancies MFe2O4-δ (δ> 0, M = Fe, Co, Mn and Ni) were investigated by XRD, Mossbauer spectroscopy and chemical analysis. The results show that the lattice constant of oxygen vacancy ferrite MFe2O4-δ (δ> 0) is larger than that of MFe2O4 + δ (δ≥0) and the magnetic field in Mossbauer spectrum is smaller. MFe2O4-δ (δ> 0) With the increase of oxygen vacancy δ, the lattice constant increases and the internal magnetic field decreases. MFe2O4-δ is unstable in air at room temperature and can only exist stably under low temperature (<673K) in inert gas. MFe2O4-δ has a strong reduction ability, at 573K CO2 can be reduced to C.