Synthesis of Monodisperse Al-Substituted Hematite Particles from Highly Condensed Metal Hydroxide Gels

✍ Scribed by Qingyuan Liu; K. Osseo-Asare

• Book ID: 102585019
• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 217 KB
• Volume: 231
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.2000.7142

✦ Synopsis

Monodispersed aluminum-substituted hematite particles were synthesized from concentrated mixed solutions of FeCl 3 and AlCl 3 using the gel-sol process. With increasing aluminum content (Al/(Fe + Al)) in the starting solutions, hematite particles became more and more elongated. The product particles exhibited ellipsoidal, rod-and peanut-like shapes, depending on Al concentration. Higher Al content (>20 mol%) in the system greatly suppressed the formation of hematite. Atomic emission spectrometry analysis and lattice parameter measurement confirmed the substitution of Al in hematite particles.