| Summary: | In the present work, for the first time, the possibility of formation of CrAl<sub>2</sub>O<sub>4</sub> was shown from the equimolar mixture of co-precipitated Al<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub> oxides under a reductive environment. The crystallographic properties of the formed compound were calculated using the DICVOL procedure. It was determined that it has a cubic crystal structure with space group Fd-3m and a unit cell parameter equal to 8.22(3) Å. The formed CrAl<sub>2</sub>O<sub>4</sub> is not stable under ambient conditions and easily undergoes oxidation to α-Al<sub>2</sub>O<sub>3</sub> and α-Cr<sub>2</sub>O<sub>3</sub>. The overall sequence of the phase transformations of co-precipitated oxides leading to the formation of spinel structure is proposed.
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