Iron oxide hydroxide prepared by low-temperature neutralization reaction in zero and low magnetic field was analyzed with XRD and SEM. The experimental results turned out that spherical and acicular goethite (α-FeOOH) was prepared in zero magnetic field. Spindly lepidocrocite (γ-FeOOH) was prepared in 0.1 T magnetic field. And its grain size distribution was not homogeneous. Sub-micron spherical Fe_1.833(OH)_0.5O_0.25 was prepared in 0.3 T magnetic field. Sub-micron spherical misawite (δ-FeOOH) of about 100 nm, the crystalline state of which was amorphous, was prepared in 0.5 T magnetic field. Fe_1.833(OH)_0.5O_0.25 was an intermediate product from goethite (α-FeOOH) prepared in zero magnetic field to misawite (δ-FeOOH) prepared in low magnetic field. And the grain size distribution of sub-micron spherical Fe_1.833(OH)_0.5O_0.25 and spherical misawite (δ-FeOOH) was homogeneous. Besides, the crystallinity of iron oxide hydroxide (FeOOH) was influenced by low magnetic field greatly.

Key words: low magnetic field, low-temperature neutralization method, sub-micron, amorphous δ-FeOOH