INFLUENCE OF CHEMICAL ADSORPTION ON THE EFFECTIVE ANISOTROPY CONSTANT OF α-Fe_2O_3 FINE PARTICLES

摘要

The properties of α-Fe2O3 fine particles with and without adsorbed pyridine were studied by Mossbauer spectra. The effective anisotropy constant K were calculated. The K of pyridine- adsorbed a -Fe2O3 particles is smaller than that of pure α-Fe2O3 particles. A probable mechanism of the decreasing effective anisotropy constant K is discussed.