M.H. Li
,
G.H. Yu
,
F.W. Zhu
金属学报(英文版)
The exchange bias field of NiFe/FeMn films with Ta/ Cu buffer was proved to be lowerthan that of the films with Ta buffer. The crystallographic texture, surface roughnessand elements distribution were examined in these two sets of samples, and there isno apparent difference for the texture and roughness. However, the segregation ofCu atoms above NiFe surface in the maltilayer of Ta/Cu/NiFe has been observed byusing the angle-resolved X-ray photoelectron spectroscopy (XPS). The decrease of theexchange bias field for NiFe/FeMn films with Ta/ Cu buffer layers is mainly causedby the Cu atoms segregation at the interface between NiFe and FeMn.
关键词:
NiFe/FeMn
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W.P. Liao
,
G.H. Yu
,
D.Q. Li
金属学报(英文版)
The extraction equilibrium of cerium(IV) and fiuoriue(l) from II2SO4 solution tyCyanex 923 was studied. The extraction mechanism of Ce(IV) and F(I) by Cyanex923 was determined by the method of slope analysis. The results showed that Cyane923 can extract HF as HF.L and Ce4+ together with HF as Ce(HF)(HSO4)2(SO4).2Lby which HF comes into the organic phase mainly when there is Ce4+ in the solution,where L is the extractant. Temperature did not affect the extraction. The IR spectraof purified Cyanex 923 saturated with Ce(IV) and HF were discussed.``
关键词:
solvent extraction
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