Effects of metal ions on the morphology and structure of haematite particles produced from forced hydrolysis reaction
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The effects of metal ions (Cu^Ⅱ, Ni^Ⅱ, CO^Ⅱ and Cr^Ⅲ) on the morphology and structure ofhaematite particles,produced from a forced hydrolysis reaction of FeCl_3-HCl at various concentrations of metal ions ranging from 0-0.8 in Me/(Fe+ Me) atomic ratio (X_(Me) ), were investigated by various means. Spherical and a few double-spherical haematite particles were altered to diamond-shaped particles with increase in the concentration of divalent metal ions accompanied by a reduction of particle size up to X_(Me) = 0.8. On the other hand, spherical haematite particles with a few double-spherical particles were formed for the system doped with Cr^Ⅲ at X_Cr<0.04 but no pure haematite particle was produced above this concentration. TEM and XRD suggested that the haematite particlesformed at X_(cu)<0.4 and X_(cr)<0.04 are polycrystalline with an enlarged c edge length in the unit cell, though thediamond-like particles produced at X_(cu)>0.6 exhibited a single-crystal nature. TG and FTIR indicated that the haematite particles produced with metal ions are hydrohaematite and contain OH^- ions in the lattice. The rate of phase transformation from(beta)-FeOOH to haematite was closely related to the crystal lattice distortion and the amounts of the lattice OH^- ions which affected the morphology and structure of the haematite particles. Part of thedopants were incorporated into the particles and were concentrated in the particle surface phase.
- Royal Society of Chemistryの論文
- 1998-00-00
Royal Society of Chemistry | 論文
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