Title :
Structure and magnetic properties of iron-based cyanide compounds
Author :
Ding, J. ; Ng, C.W. ; Shi, Y.
Author_Institution :
Dept. of Mater. Sci., Nat. Univ. of Singapore, Singapore
fDate :
7/1/2001 12:00:00 AM
Abstract :
The M1.5[Fe(CN)6]·zH2O powders with M=Ni, Co, Cu and Zn and z=4-7 were prepared by co-precipitation. A structural change was found after heat treatment at a temperature in the range of 100-200°C. Mossbauer and magnetic measurements have shown that the FeIII-CN-MII state was the major structure in the co-precipitated form, while the Fe II-CN-MIII bond was formed in the annealed samples. The stable FeII-CN-MIII state could convert into a metastable FeIII-CN-MII state accompanied by two peaks in UV-visible spectra. A broad peak was observed in the photo-luminescence spectra, indicating the potential for optical applications
Keywords :
Mossbauer effect; annealing; iron compounds; magnetic particles; molecular magnetism; photoluminescence; powders; precipitation (physical chemistry); ultraviolet spectra; visible spectra; 100 to 200 C; Co1.5[Fe(CN)6]; Co1.5[Fe(CN)6]·zH2O powder; Cu1.5[Fe(CN)6]; Cu1.5[Fe(CN)6]·zH2O powder; Mossbauer spectra; Ni1.5[Fe(CN)6]; Ni1.5[Fe(CN)6]·zH2O powder; UV-visible spectra; Zn 1.5[Fe(CN)6]·zH2O powder; Zn1.5[Fe(CN)6]; annealing; co-precipitation; heat treatment; iron cyanide compound; magnetic properties; metastable state; molecular magnet; photoluminescence spectra; structure; Annealing; Bonding; Heat treatment; Iron; Magnetic properties; Magnetic variables measurement; Metastasis; Powders; Temperature distribution; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
