Title :
X-ray and magnetic studies of scandium substituted Ni-Zn ferrites
Author :
Parvatheeswara Rao, B. ; Subba Rao, P.S.V. ; Rao, P. S V Subba
Author_Institution :
Dept. of Phys., Andhra Univ., Visakhapatnam, India
fDate :
11/1/1997 12:00:00 AM
Abstract :
The approach of simultaneous substitutions by aiming at a systematic dilution of both of the sublattices to obtain the highest possible magnetization in a given system has been made use of, since this parameter is highly desirable in the fabrication of core materials for switched mode power supplies (SMPS), Ferrite series of the compositions Ni0.65Zn0.35Fe2-xScO4 , with x values ranging from 0.00 to 0.25 in steps of 0.05, and Ni 0.65-xZn0.35+xFe2-xScxO 4, with x values ranging from 0.000-0.125 in steps of 0.025, have been prepared using optimum sintering conditions for this study. Observed variations in saturation magnetization and Curie temperature for the two series have been explained on the basis of site distributions of the Zn2+ and Sc3+ ions and the strength of the exchange interactions between magnetic ions. From the magnetization studies, conclusions have been drawn toward the cation distribution in the ferrites, Variations of lattice constant with the substituent concentration in both of the systems are also discussed
Keywords :
Curie temperature; X-ray diffraction; exchange interactions (electron); ferrites; lattice constants; magnetisation; nickel compounds; scandium compounds; sintering; soft magnetic materials; switched mode power supplies; zinc compounds; Curie temperature; NiZnFe2O4Sc2O4; cation distribution; core materials; dilution; exchange interactions; lattice constant; saturation magnetization; sintering; site distributions; soft magnetic materials; sublattices; switched mode power supplies; Composite materials; Fabrication; Ferrites; Iron; Magnetic cores; Magnetic materials; Saturation magnetization; Switched-mode power supply; Temperature distribution; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
