Stock material or miscellaneous articles – Metal continuous phase interengaged with nonmetal continuous...
Patent
1978-11-09
1979-12-11
Cooper, Jack
Stock material or miscellaneous articles
Metal continuous phase interengaged with nonmetal continuous...
252 6256, 252 6262, 428900, C01G 4906
Patent
active
041784162
ABSTRACT:
Cobalt doped, acicular, gamma ferric oxide which exhibits reduced print-through without substantial loss in signal output or recording sensitivity is disclosed. This cobalt doped, acicular, gamma ferric oxide is prepared in the presence of a water soluble, acyclic dicarboxylic acid or its precursor which alters or modifies the usual distribution of the cobalt doping ions in the crystal lattice. The dicarboxylic acid directs the distribution of the cobalt doping ions into the crystal lattice in such a way that the crystals obtained by the process disclosed exhibit an increase of at least 5% in the ratios between the intensities of each of the triplet lines 110, 210 and 211 with respect to the 111 line, as shown upon examination by X-ray diffraction analysis. Typical dicarboxylic acids disclosed are oxalic acid, malonic acid, succinic acid, glutaric acid and maleic acid. Magnetic recording products such as tapes, discs and the like, containing the improved cobalt doped, acicular, gamma ferric oxide are also disclosed.
REFERENCES:
patent: 3720618 (1973-03-01), Toda et al.
patent: 3843773 (1974-10-01), Pingaud
patent: 3912646 (1975-10-01), Leitner et al.
patent: 4010310 (1977-03-01), Kubota et al.
Hector Jean-Marie H.
Pingaud Bernard J.
Cooper Jack
Eastman Kodak Company
Wiese Bernard D.
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