Cobalt ferrite

Using a similar procedure, based on the thermal decomposition of a metal-surfactant complex followed by mild oxidation, we synthesized highly crystalline and monodisperse nanocrystals of cobalt ferrite (CoFc204), manganese ferrite (MnFe204) MnO, and Ni [5]. 

For cobalt ferrite, CoFe204, the energy effect in the valency reaction Co(II) + Fe(III) —> Co(III) -H Fe(II) has been calculated to be 1.35 eV from the ionization potentials and crystal-field stabilization effects. The combination Co(II) + Fe(III) is the ground state. For titanium in Fe203 the following reaction is of importance... 

Moumen, N. and Pileni, M.P. (1996) Control of the size of cobalt ferrite magnetic fluid. Journal of Physical Chemistry, 100 (5), 1867-1873. 

Prasad, S., Vijayalakshmi, A., Gajbhiye, N.S., Synthesis of ultrafine cobalt ferrite by thermal decomposition of citrate precursor, J. Therm. Anal. Calorim. 52, 5-10 (1998). 

Oxygen Tracer Diffusion Coefficient (D ), Oxygen Surface Exchange Coefficient (Ar) and Oxygen Ionic Conductivity (a, in air) of Doped Lanthanum Cobalt Ferrite-Based Perovskites... 

Single-phase perovskite MIECs such as Sr-doped lanthanum cobaltite (LSC), lanthanum ferrite (LSF), lanthanum cobalt ferrite (LSCF) and samarium cobaltite (SSC), and Ca-doped lanthanum ferrite (LCF) [13] are sometimes used alone in SOFC cathodes, as depicted in the lower right-hand comer of Figure 6.1, but combining an... 

The first one is the bulk magneto crystalline anisotropy field. It depends on the chemical composition and crystallographic structure of the material. For instance, the anisotropy constant is 30 times larger in cobalt ferrite particles than in magnetite particles. 

Iron(II) cobalt ferrites Preparation and interfadal behaviour. J. Chem. Soc. Faraday Trans. I. 83 1159-1168 Ardizzone, S. Formaro, L. Sivieri, E. Burriesd,... 

Dissolution of cobalt ferrites by thio-glycolic add. J. Chem. Soc. Faraday Trans. I. 

Duran, J.D.G. Gonzallez-Caballero, E. (2000) Stability of cobalt-ferrite colloidal particles. Effect of pH and applied magnetic field. Langmuir 16 7954-7961 De Vitre, R. Belzile, N. Tessier, A. (1991) Spe-ciation and adsorption of arsenic on diage-netic iron oxyhydroxides. Limnol. Oceanogr. 36 1480-1485... 

In a similar manner, uniform spherical particles of nickel ferrite (NiFe204) (6), cobalt ferrite (CoFe204) (7), and cobalt-nickel ferrite (CorNi vFe204) (8) were prepared as well. 

Figure 2 X-ray diffractogram of the inverse spinel cobalt ferrite CoFejO,. ...

Cobalt ferrite, Co(Fe02)2, is obtained by addition of normal sodium hydroxide solution to a mixed solution of cobalt nitrate and ferric chloride, and igniting. It is a black powder, magnetic when cold, but non-magnetic above 280° to 290° C.7... 

Cobalt-coated pigment particles (1.6-4 wt.% Co) consist of a core of Y-F6203 or non-stoichiometric iron oxide phase, and a 1-2 nm coating of cobalt ferrite with a... 

A detailed investigation about the growth of cobalt ferrite single crystals through a borax flux method and its characterization was reported by Wang and Ren [40]. 

The Raman spectrum of cobalt ferrite single crystals excited by 532 nm laser line, attained at room temperature, is reproduced in Fig. 14.5. By performing the fitting of the Raman spectra displayed in Fig. 14.5, it would be possible to observe Raman bands at 183, 304, 469, 573, 627, and 696, listed in Table 14.2. Apart from Fc304, y-Fe203, and CoFc204, others ferrites such as NiFc204 and Fc3 . Zn - O4 which... 

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