Magnetization of cadmium ferrite prepared by coprecipitation

被引:33
作者
Yokoyama, M
Sato, T
Ohta, E
Sato, T
机构
[1] KEIO UNIV,FAC SCI & TECHNOL,DEPT INSTRUMENTAT ENGN,KOHOKU KU,YOKOHAMA,KANAGAWA 223,JAPAN
[2] TOKYO ENGN UNIV,FAC ENGN,DEPT ELECTR,HACHIOJI,TOKYO 192,JAPAN
关键词
D O I
10.1063/1.362834
中图分类号
O59 [应用物理学];
学科分类号
摘要
We investigated the magnetization of the ultrafine cadmium ferrite particles formed during the coprecipitation method and discussed the origin of enhanced magnetization based on the magnetic properties. A transmission electron microscopy micrograph shows aggregation of fine particles having two kinds of shapes, fibrous and granular. X-ray diffraction patterns of the specimens prepared by the coprecipitation method are composed of peaks corresponding to CdFe2O4, Cd(OH)(2), and alpha-FeO(OH). The pattern indicates that the peaks of CdFe2O4 are fairly broad, suggesting the formation of a very small crystallite, with an average size of similar to 8 nm. The ultrafine CdFe2O4 particles exhibit ferromagnetic behavior and have a net magnetization of 89+/-5 emu/g at 6 K. These results suggest that there must be many ferromagnetic clusters consisting of Fe3+ ions at the B sites around Fe3+ ions at the A site by the A-B interactions. Thus, such a change in the distribution of Fe3+ ions in the ultrafine CdFe2O4 particles results in increasing magnetization with decreasing particle size. (C) 1996 American Institute of Physics.
引用
收藏
页码:1015 / 1019
页数:5
相关论文
共 16 条
[1]   INFLUENCE OF SIZE AND MAGNETOCRYSTALLINE ANISOTROPY ON SPIN CANTING ANOMALY IN FINE FERRIMAGNETIC PARTICLES [J].
HAN, DH ;
WANG, JP ;
FENG, YB ;
LUO, HL .
JOURNAL OF APPLIED PHYSICS, 1994, 76 (10) :6591-6593
[2]   PARTICLE-SIZE DISTRIBUTION OF COFE2O4 FORMED BY COPRECIPITATION METHOD [J].
HASEGAWA, K ;
SATO, T .
JOURNAL OF APPLIED PHYSICS, 1967, 38 (12) :4707-&
[3]   AN ANTIFERROMAGNETIC TRANSITION IN ZINC FERRITE [J].
HASTINGS, JM ;
CORLISS, LM .
PHYSICAL REVIEW, 1956, 102 (06) :1460-1463
[4]   CATION DISTRIBUTION IN ZNFE2O4 FINE PARTICLES STUDIED BY NEUTRON POWDER DIFFRACTION [J].
KAMIYAMA, T ;
HANEDA, K ;
SATO, T ;
IKEDA, S ;
ASANO, H .
SOLID STATE COMMUNICATIONS, 1992, 81 (07) :563-566
[5]   MAGNETIC EQUATION OF STATE FOR CRO2 AND NICKEL NEAR THEIR CURIE POINTS [J].
KOUVEL, JS ;
RODBELL, DS .
PHYSICAL REVIEW LETTERS, 1967, 18 (06) :215-+
[6]   STUDY OF 6S5-2-TERM SPLITTING OF AN FE3+ ION IN ZINC FERRITE BY NEUTRON SPECTROSCOPY [J].
LIGENZA, S .
PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1976, 75 (01) :315-326
[8]  
Miller A., 1959, J. Appl. Phys., V30, pS24, DOI DOI 10.1063/1.2185913
[10]  
Sato T., 1987, Proceedings of the International Symposium on Physics of Magnetic Materials, P210