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Citation: Wei Yu, Liu Xiaolin, Zheng Xuezhong. Preparation of Non-polar Magnetic Powder 1.Direct Synthesis of Spindle α-Fe₂O₃ from FeSO₄ by Air Oxidation[J]. Chinese Journal of Applied Chemistry, ;1997, 14(2): 110-112. shu

Preparation of Non-polar Magnetic Powder 1.Direct Synthesis of Spindle α-Fe₂O₃ from FeSO₄ by Air Oxidation

1.
Department of Chemistry, Hebei Normal University, Shijiazhuang 050016

Received Date: 26 July 1996
Available Online: 6 November 1996

V-FeOOH crystals were grown from FeSO₄ by the air oxidation of ferrous hydroxide suspension in the presence of EDTA, and then 100% spindle T-Fe₂O₃ particles were prepared by adding 0.0025 mol/L hydroxyethylidene diphosphonic acid (HEDP) at 90~95℃. The mean particle length is 150~180 nm and the axial ratio is 3.5~3.8. A series of experiments were carried out with HEDP concentrations ranging from 0.0015 to 0.003 mol/L. The effect of HEDP concentration on T-Fe₂O₃ morphology is discussed.
- spindel T-Fe₂O₃,
- air oxidation,
- Fe(OH)₂
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Preparation of Non-polar Magnetic Powder 1.Direct Synthesis of Spindle α-Fe₂O₃ from FeSO₄ by Air Oxidation