Title :
Effect of Additive Oxides on Formation of Amorphous CoFe2O4 and Magnetic Properties
Author :
Sugimoto, M. ; Naya, K. ; Takahashi, T. ; Tomizawa, H. ; Hiratsuka, N.
Author_Institution :
Saitama University, Faculty of Engineering, Urawa-shi.
Abstract :
The authors studied conditions for preparation of amorphous CoFe2O4 samples by adding either P2O5 and MoO3, or P2O5 and V2O5, or CaO and V2O5, followed by mixing, heat-fusing at from 1000 to 4000°C, and quenching in water. X-ray analysis indicated that samples formed by adding P2O5 and MoO3 were amorphous even when heat-fused at temperatures as low as 1000°C. The amorphous composition regions for each system were determined. Magnetization in all samples increases sharply at temperatures below 100 K, but Mössbauer Spectroscopy revealed paramagnetic behavior at room temperatute.
Keywords :
Absorption; Additives; Amorphous materials; Crystallization; Magnetic field measurement; Magnetization; Spectroscopy; Temperature dependence; Tires; Water heating;
Journal_Title :
Magnetics in Japan, IEEE Translation Journal on
DOI :
10.1109/TJMJ.1985.4548951
