Compositions of particulate magnetic oxides with a defect spinel
structure, preparation thereof and application thereof
    1.
    发明授权
    Compositions of particulate magnetic oxides with a defect spinel structure, preparation thereof and application thereof 失效
    具有缺陷尖晶石结构的颗粒状磁性氧化物的组合物,其制备方法及其应用

    公开(公告)号:US4808327A

    公开(公告)日:1989-02-28

    申请号:US62609

    申请日:1987-06-01

    摘要: Particulate magnetic oxide compositions based on iron oxide (III) and oxide of at least one bivalent metal selected among cobalt, iron, copper, zinc, magnesium, nickel, manganese and cadmium, characterized in that said compositions contain additionally in the form of an oxide from 0.2 to 5% by weight calculated on the total weight at least one additive or substituent selected among alkali metals, alkaline-earth metals, boron, the elements of columns 3, 4 and 5 of the periodical classification of elements having a molecular mass higher than 26, the transition metals 3d and 4d other than those already mentioned, and the rare earths, with the proviso that when an alkali metal or tin is present, at least another additive or substituent is also present, and in that said compositions have a structure of the lanucar spinel type; the preparation and application thereof are also disclosed.

    摘要翻译: PCT No.PCT / FR86 / 00337 Sec。 371日期:1987年6月1日 102(e)日期1987年6月1日PCT提交1986年9月30日PCT公布。 公开号WO87 / 02173 日本1987年4月9日。基于氧化铁(III)和选自钴,铁,铜,锌,镁,镍,锰和镉中的至少一种二价金属的氧化物的颗粒状磁性氧化物组合物,其特征在于所述组合物含有 另外以0.2至5重量%的氧化物的形式,其总重量计算为选自碱金属,碱土金属,硼中的至少一种添加剂或取代基,定期分类的第3,4和5列的元素 的分子量高于26的元素,过渡金属3d和4d以外的已知的稀土元素和稀土元素,条件是当存在碱金属或锡时,还存在至少另一种添加剂或取代基, 并且所述组合物具有兰卡尔尖晶石型结构; 还公开了其制备和应用。