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本章主要介绍γ-Fd_2O_3。磁粉的起始材料α-Fe00H、β-Fc00H,γ-FeOOH、δ-FeOOH的制备方法,以及由它们制备γ一Fe_2O_3磁粉过程中的结构转变。自1898年丹的V-Poulsen采用钢丝作为录音介质设计了第一台磁录音机以来.磁记录材料经历了一个由钢丝、合金钢带到氧化铁、二氧化铬、含钴氧化铁、金属、合金粉、合金薄膜等发展过程。现在它们已被广泛用于录音、录象、计算机等各个领域。在众多的磁记录材料中,γ-Fe_2O_3磁粉从它登上磁记录舞台之日起,就以其稳定、价廉,合适的磁性等在磁记录材料家族中占据着重要的一席。今天,γ-Fe_2O_3和以γ-Fe_2O_3为基础的包钴磁粉仍然是各种磁带的主流磁粉,进一步改善其特性以适应磁记录技术速发展的需要,仍然具有重要的意义。制备γ-Fe_2O_3。最通用的方法一般包括下列步骤:(1)制备铁黄,(2)铁黄脱水转变为α-Fe_2O_3;(8)α-Fe_2O_3毒还原为Fe_O_4;(4)将Fe_3O_4氧化为γ-Fe_2O_3。
This chapter introduces γ-Fd_2O_3. Preparation Methods of Magnetic Materials α-Fe00H, β-Fc00H, γ-FeOOH, δ-FeOOH, and Their Structural Transformations in the Preparation of γ-Fe 2 O 3 Magnetic Powders. Since V-Poulsen of Danmark designed the first magnetic tape recorder using wire as a recording medium in 1898, the magnetic recording material has undergone a magnetic field consisting of steel wire, alloy steel to iron oxide, chromium dioxide, cobalt oxide, metal, Powder, alloy film and other development process. Now they are widely used in various fields such as recording, video recording, computer and so on. Among many magnetic recording materials, γ-Fe 2 O 3 magnetic powder occupies an important place in the family of magnetic recording materials with its stable, inexpensive and suitable magnetic properties since it was mounted on the magnetic recording stage. Today, γ-Fe 2 O 3 and γ-Fe 2 O 3 -based cobalt-coated magnetic powders are still the mainstream magnetic powders for various magnetic tapes. It is still of great significance to further improve their properties to meet the needs of the rapid development of magnetic recording technology. Preparation of γ-Fe_2O_3. The most common method generally includes the following steps: (1) preparation of iron yellow, (2) dehydration of iron yellow into α-Fe_2O_3; (8) reduction of α-Fe_2O_3 to Fe_O_4; and (4) oxidation of Fe_3O_4 to γ-Fe_2O_3.