Abstract
The synthesis of chromium oxide (Cr 2O 3) nanoparticles by mechanochemical reaction and subsequent heat treatment was investigated. A solid-state displacement reaction Na 2Cr 2O 7+S→Cr 2O 3+Na 2SO 4 was induced during mechanical milling of Na 2Cr 2O 7+S powder mixture, forming amorphous Cr 2O 3 nanoparticles. Annealing the as-milled powder under vacuum above 520°C resulted in the formation of crystalline Cr 2O 3 nanoparticles separated from each other in a salt matrix. A simple washing process to remove the matrix yielded Cr 2O 3 particles of 10–80 nm in size, having a plate-like morphology.
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