Compositions – Magnetic
Patent
1994-09-16
1996-09-17
Bonner, Melissa
Compositions
Magnetic
423445R, C01B 3102, H01F 142
Patent
active
055565700
ABSTRACT:
The invention provides a carbonaceous ferromagnetic material consisting substantially of carbon alone as prepared by the carbonization of a specific aromatic compound, such as phenazine and indigo, to such an extent that the hydrogen atoms in the starting aromatic compound are eliminated as completely as possible but graphitization of the carbonization product does not take place by conducting the carbonization treatment at a temperature not exceeding 800.degree. C. The carbonization reaction can be promoted by admixing the aromatic compound with a compound of a ferromagnetic metallic element such as cobalt chloride, which is removed from the carbonization product by dissolving away with hydrochloric acid and ammonia water. Elimination of hydrogen atoms from the aromatic compound can be more complete by conducting the heat treatment for the carbonization in an atmosphere containing a halogen-generating agent such as carbon tetrachloride.
REFERENCES:
patent: 4263268 (1981-04-01), Knox et al.
patent: 4832881 (1989-05-01), Arnold, Jr. et al.
Bonner Melissa
Japan as represented by Director General of Agency of Industrial
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