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发明授权
CN107635924B ε氧化铁及其制造方法、磁性涂料和磁记录介质 有权

ε氧化铁及其制造方法、磁性涂料和磁记录介质
摘要：
本发明提供ε氧化铁及其制造方法，所述ε氧化铁是铁元素的一部分被置换元素置换而成的ε氧化铁，其具有10～18nm的平均粒径、矫顽力为14kOe以下并且该粒径的变异系数为40％以下。本发明提供ε氧化铁的制造方法，其特征在于，具有如下工序：使羟基氧化铁粘附作为置换元素的金属，得到粘附有前述金属的羟基氧化铁的工序；用硅氧化物涂覆粘附有前述金属的羟基氧化铁，得到涂覆有前述硅氧化物的羟基氧化铁的工序；和、在氧化性气氛下对涂覆有前述硅氧化物的羟基氧化铁进行热处理的工序，从而制造铁元素的一部分被前述置换元素置换而成的ε氧化铁。
摘要（英）：

There is provided epsilon iron oxide having an average particle size of 10 to 18 nm, a part of the iron element being substituted with a substitutional element and having a coercive force of 14 kOe or less, wherein a coefficient of variation of the particle size is 40% or less, and provide a method for producing the same, a magnetic coating material and a magnetic recording medium using the epsilon iron oxide, including the steps of: depositing a metal compound of a substitutional element on iron oxide hydroxide to thereby obtain iron oxide hydroxide on which the metal compound is deposited; coating the iron oxide hydroxide on which the metal compound is deposited, with silicon oxide to thereby obtain iron oxide hydroxide coated with the silicon oxide; and applying heat treatment to the silicon oxide-coated iron oxide hydroxide in an oxidizing atmosphere, wherein a part of an iron element is substituted with the substitutional element.

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