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Synthesis of cobalt ferrite nanocrystallites by the forced hydrolysis method and investigation of their magnetic properties
- Source :
-
Physica B . Apr2003, Vol. 327 Issue 2-4, p382. 3p. - Publication Year :
- 2003
-
Abstract
- Cobalt ferrite powder has been synthesized by the forced hydrolysis method in 1,2-propanediol. The particles, having a cubic spinel structure, are nanocrystallites with a mean diameter of 4 nm with almost equiaxial shapes and a narrow size distribution. These particles are superparamagnetic at room temperature and ferrimagnetic at temperatures below the blocking temperature of about 180 K. A remarkable shift of the blocking temperature with frequency was observed in the AC susceptibility measurements. The calculated value of anisotropy constant at 0 K, <f>KA(0)=5.36</f>×107 erg/cm3, is higher than that in the bulk material. The saturation magnetization and the coercivity measured at 5 K are 75 emu/g and 10.3 kOe, respectively. [Copyright &y& Elsevier]
- Subjects :
- *NANOPARTICLES
*MAGNETISM
Subjects
Details
- Language :
- English
- ISSN :
- 09214526
- Volume :
- 327
- Issue :
- 2-4
- Database :
- Academic Search Index
- Journal :
- Physica B
- Publication Type :
- Academic Journal
- Accession number :
- 9281703
- Full Text :
- https://doi.org/10.1016/S0921-4526(02)01750-7