Abstract
Abstract A series of nano-Cr 2− x Al x O 3 ( x = 0–1) solid solution powders were prepared by sol–gel-chelating processing with citrate-dispersant method. The crystalline structure and size of the Cr 2− x Al x O 3 powders were determined by X-ray diffraction and transmission electron microscopy. It was demonstrated that the crystalline size of the Cr 2− x Al x O 3 powders decreases from 33 nm to 13 nm with an increase in the amount of Al 2 O 3 substitution. The aluminum in the lattice of the Cr 2− x Al x O 3 can effectively prevent the crystalline growth of the Cr 2− x Al x O 3 powders during calcining at higher temperature.
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