Co-ferrite

Ni-Co ferrites with the general formula Nii cCoxFe204 were tested for the methylation of pyridine [110]. It was observed that the systems possessing x values >0.5 are selective for 3-picoline formation, whereas the ones with x values 0 and 0.2 give a mixture of 2- and 3-picolines. Pyridine conversion increased with the progressive substitution of Ni ions by Co ions. The cation distribution in the spinel lattice influences their acidic and basic properties, and these factors have been considered as helpful to evaluate the activity of the systems. 

Coercivity increase for iron oxide magnetic pigments by Co-doping or Co-ferrite coating... 

Yam] Yamamoto, K., Kimura, Y, Mishima, Y, Precipitation Behavior and Phase Stability of Inter-metallic Phases in Fe-Cr-W-Co Ferritic Alloys , Mat. Sci. Forum, 475-479, 845-848 (2005) (Morphology, Phase Relations, Experimental, Electronic Structure, 14)... 

K, Kondo, S, Yoshida, and H, Ono, M. Abe, Spin sprayed Ni(-Zn)-Co ferrite films with natural resonance fi equency exceeding 3 GHz,y. Appl Plys., 101,09M502, (2007). 

Loche D, Casula MF, Falqui A, Marras S, Corrias A (2010) Preparation of Mn, Ni, Co ferrite nanocomposite aerogels by an urea-assisted sol-gel procedure. J Nanosci Nanotechnol 10 1008-1016. doi 10.1166/ jnn.2010.1907... 

Fig. 4.9 Mossbauer spectrum recorded at 10 K on 6 nm Co ferrite nanoparticles prepared by thermal decomposition route submitted to an external of 8T applied parallel to the y-beam [73]...

Khedr MH, Omar AA, Abdel-Moaty SA (2006) Magnetic nanocomposites preparation and characterization of Co-ferrite nemopeirticles. Colloid Surf A 281(l-3) 8-14. doi 10.1016/j.colsurfa.2006.02.005... 

The activity of Fe is decreased by addition of Ni [78, 79], and a Mn-Fe alloy of 30-40 percent Mn gives a high activity [80]. The conventional promoted iron catalyst is further promoted by the addition of Co. The catalysts are prepared by burning a Fe-Co alloy in O2 followed by the addition of promoters [81]. The alloying effect of Fe-Co, and Fe-Ni was studied in detail [82]. The addition of 3-7 wt% RUO2 to a catalyst composed of Co ferrite (25-35%), Mg ferrite (20-25%), K2O (0.5-2%), and Fe oxide (rest%) increases the ammonia activity and heat resistance of the catalyst [83]. 

A. Goldman, Modem Ferrite Technology, Van Nostrand Reinhold Co., Inc., New York, 1990. 

Materials for MO Media. The materials classes best suited for MO media are RE-TM alloys, Co/Pt multilayers, and ferrites. The quality of disks is mainly characterised by the signal-to-noise ratio (SNR). 

Fig. 10. Demagnetization curves of hard magnetic materials A, Nd2Fe B B, Sm(Co, Cu,Fe,Zr)2 C, SmCo D, bonded SmCo E, Alnico 5 F, Mn—Al—C G, Alnico 8 H, Cr—Co—Fe I, ferrite , bonded ferrite. To convert T to G, multiply by 10". ...

Ferrite Cores— for Telecommunication and Industrial Fields," TDK Data Book, TDK Electronics Co., Ltd., Skokie, HI., Eeb. 1981. 

T. Akashi and co-workers. Ferrites—Proceedings 1970 International Conference, University of Tokyo Press, Japan, 1971, p. 183. 

F. N. Bradley, "Chemistry, Microstmcture, and Processing of Ferrites," in A. E. Javit2, ed.. Materialsfor Magnetic Functions, Hayden Book Co., Inc., New York, 1971. 

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