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The Formation of Cr-Al Spinel under a Reductive Atmosphere.


ABSTRACT: In the present work, for the first time, the possibility of formation of CrAl2O4 was shown from the equimolar mixture of co-precipitated Al2O3 and Cr2O3 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 CrAl2O4 is not stable under ambient conditions and easily undergoes oxidation to α-Al2O3 and α-Cr2O3. The overall sequence of the phase transformations of co-precipitated oxides leading to the formation of spinel structure is proposed.

SUBMITTER: Shtyka O 

PROVIDER: S-EPMC8230446 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature

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The Formation of Cr-Al Spinel under a Reductive Atmosphere.

Shtyka Oleksandr O   Maniukiewicz Waldemar W   Ciesielski Radoslaw R   Kedziora Adam A   Shatsila Viktar V   Sierański Tomasz T   Maniecki Tomasz T  

Materials (Basel, Switzerland) 20210610 12


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  ...[more]

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