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Plate-like barium ferrite particles suitable for use in magnetic recording and process for producing the same
| Details |
Inventors: Nagai, Norimichi; Hirayama, Akihiko; Sugita, Norio; Kiyama, Masao; Takada, Toshio; Fujimoto, Katsunori; Ota, Yasutaka;
Assignee: Toda Kogyo Corp. (Hiroshima, JP)
Primary Examiner: Thibodeau; Paul J.
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman
Disclosed herein are plate-like barium ferrite particles with a solid solution of zinc on the surface thereof, which have an average particle diameter of not less than 0.03 .mu.m and less than 0.1 .mu.m, a BET specific surface are of 55 to 80 m.sup.2 /g, a coercive force of 300 to 1,500 Oe and a magnetization of not less than 57 emu/g, preferably not less than 60 emu/g, in magnetic field of 10 KOe, and which are represented by the following formula (I): BaO.n[(Fe.sub.1-x-y Co.sub.x Ti.sub.y).sub.2 O.sub.3-x+y ] (I) wherein x and y are independently from 0.02 to 0.12 and n is from 4 to 11, the atomic ratio of Co to Fe(III) being from 0.02:1 to 0.13:1 and the molar ratio of Ti to Co being from more than 0 to not more than 0.8, and a process for producing the plate-like barium ferrite particles. |
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DETAILED DESCRIPTION In a first aspect of the present invention, there is provided plate-like barium ferrite particles with a solid solution of zinc on the surface thereof, which have an average particle diameter of not less than 0.
03 .
mu.
m and less than 0.
1 .
mu.
m, a BET specific surface area of 55 to 80 m.
sup.
2 /g, a coercive force of 300 to 1,500 Oe and a magnetization of not less than 57 emu/g in magnetic field of 10 KOe, and which are represented by the following formula (I): BaO.
multidot.
n[(Fe.
sub.
1-x-y Co.
sub.
x Ti.
sub.
y).
sub.
2 O.
sub.
3-x+y ](I) wherein x and y are independently from 0.
02 to 0.
12 and n is from 4 to 11, the atomic ratio of Co to Fe(III) being from 0.
02:1 to 0.
13:1 and the molar ratio of Ti to Co being from more than 0 to not more than 0.
8.
In a second aspect of the present invention, there is provided a process for producing plate-like barium ferrite particles with a solid solution of zinc on the surface thereof, which are represented by the following formula (I): BaO.
multidot.
n[(Fe.
sub.
1-x-y Co.
sub.
x Ti.
sub.
y).
sub.
2 O.
sub.
3-x+y ](I) wherein x and y are independently from 0.
02 to 0.
12 and n is from 4 to 11, the atomic ratio of Co to Fe(III) being from 0.
02:1 to 0.
13:1 and the molar ratio of Ti to Co being from more than 0 to not more than 0.
8, which comprises autoclaving at a temperature of from 120.
degree.
to 330.
degree.
C.
an aqueous alkaline suspension of iron hydroxide containing Co(II), Ti(IV) and Ba ions and a molar excess with respect to the total amount of Fe(III), Co(II), Ti(IV) and Ba ions of an alkali metal hydroxide, in said suspension the atomic ratio of the amount to Co to the amount of Fe(III) being from 0.
02:1 to 0.
13:1 and the molar ratio of Ti to Co being from more than 0 to not more than 0.
8, suspending the thus obtained plate-like barium ferrite particles containing Co and Ti in an aqueous solution containing zinc of pH 4.
0 to 12.
0 to deposit the zinc hydroxide on the surface of said plate-like Ba particles containing Co and Ti, filtering out and drying the plate-like barium ferrite particles containing Co and Ti deposited with the hydroxide of zinc on the surfaces thereof, and baking the particles obtained at a temperature of 600
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Heat Accumulators 
