Journal of Inorganic Materials

• Research Paper • Previous Articles     Next Articles

Hydrolysis Mechanism of Ellipsoidal α-Fe2O3 before Nucleation

LI Qiao-Ling1; WEI Yu2; LI Lin 1   

  1. 1.Light md. & Chem. Eng. Res. Inst.; South China Univ. of Tech.; Guangzhou 510640; China; 2. Chemistry Department; He Bet Normal University; Shijiazhuang 050016; China
  • Received:1999-11-24 Revised:1999-12-27 Published:2000-12-20 Online:2000-12-20

Abstract: The hydrolysis mechanism of Fe(III) solution is rather complicated when small amounts of phosphate ions are present. The process may be divided into two
stage, namely, before and after precipitation. The former was studied by Ferron-complex ion timed spectrophotometric method in this paper. The
method was used to classify the aqueous species of Fe(III) into three categories, i.e., Fe(a), Fe(b) and Fe(c), which represent their different exents of
hydrolysis and polymerization, respectively. The site of phosphate was indirectly defined by the shape of Fe(III) recovery curve. The
reason why the presence of phosphate can restrain the hydyolysis of Fe(III) solution is expounded. The result obtained has a specific signifitance
for guiding the synthesis of uniform and ellipsoidal hematite(α-Fe2O3) particles.

Key words: ellipsoidal α-Fe_2O_3 particles, hydrolysis mechanism

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