发明名称 |
Process for producing microcrystalline Co/Ti-substituted barium ferrite platelets |
摘要 |
A process of producing a spinel structure Ni/Zn ferrite-modified, Co/Ti-substituted microcrystalline barium ferrite platelets having an average particle size of 0.03-0.15 mu m, a temperature coefficient of coercive force of not more than +1 Oe/ DEG C., including small absolute values in negative region, and a saturated magnetization of not less than 56 emu/g, which comprises: forming substantially amorphous preecursors of Co/Ti-substituted barium ferrites; adding an aqueous solution of nickel salts to the dispersion of the precursors of Co/Ti-substituted barium ferrites, and subjecting the slurry to hydrothermal reaction, thereby to provide precursors of spinel structure nickel ferrite-modified, Co/Ti-substituted barium ferrites; depositing a water insoluble zinc compound on the precursors; and calcining the precursors in the presence of barium chloride, washing the calcined products to remove therefrom the barium chloride, and drying.
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申请公布号 |
US4960582(A) |
申请公布日期 |
1990.10.02 |
申请号 |
US19890387965 |
申请日期 |
1989.08.01 |
申请人 |
SAKAI CHEMICAL INDUSTRY CO., LTD. |
发明人 |
IWASAKI, SUSUMU;KAMISAKA, SHIGEFUMI;YAMAZAKI, IWAO;HATANAKA, TUTOMU |
分类号 |
B22F9/24;C01G49/00;G11B5/706;H01F1/11 |
主分类号 |
B22F9/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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