Patent ID: 6596255
Filing Date: 2003-07-22
Classification: B82Y,C01G,C01P,G03G,G11B,H01F

Abstract:
Tin-containing granular magnetic oxide particles comprising spinel-type crystal represented by the formula:Fe3-xSnxO4 wherein x is 0.14 to 0.48, andhaving a Fe2+ content of 17 to 22% by weight, a lattice constant of 8.41 to 8.49 Ã¥, a magnetization value of 20 to 50 Am2/kg when measured under an applied magnetic field of 79.6 kA/m, and a depth of a groove of not more than 40 &mgr;m at which three or more continuous lines each having a length of not less than 10 mm are developed in a pigment dispersion test using a grind-meter when measured by Hoover's muller method according to JIS K5101 (1991) 9.1.