Effect of mechanical activation on the synthesis of α-Fe2O3-Cr2O3solid solutions

✍ Scribed by P. Tsokov; V. Blaskov; D. Klissurski; I. Tsolovski

• Publisher: Springer
• Year: 1993
• Tongue: English
• Weight: 328 KB
• Volume: 28
• Category: Article
• ISSN: 0022-2461
• DOI: 10.1007/bf00349050

✦ Synopsis

Continuous r

solid solution series have been synthesized by two methods: (i) direct heating of coprecipitated hydroxides, and (ii) mechanical pre-treatment followed by heating. It is shown that mechanical treatment leads to a decrease in the preparation temperature of the solid solutions to 623 K. The formation of a continuous solid solution series by direct heating begins only at 773 K. The formation of the solid solutions was established by X-ray diffraction analysis, infrared and M6ssbauer spectroscopy. The decrease in synthesis temperature of the ~-Fe203-Cr203 solid solutions is attributed to activation of the samples during their mechanical treatment. The samples obtained have large specific surface areas (up to 130 m 2 g-l).