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Volume 14
Issue 12
10.3390/ma14123218
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Article

The Formation of Cr-Al Spinel under a Reductive Atmosphere

by
Oleksandr Shtyka
*,
Waldemar Maniukiewicz
,
Radoslaw Ciesielski
,
Adam Kedziora
,
Viktar Shatsila
,
Tomasz Sierański
and
Tomasz Maniecki
Institute of General and Ecological Chemistry, Lodz University of Technology, 90924 Lodz, Poland
*
Author to whom correspondence should be addressed.
Materials 2021, 14(12), 3218; https://doi.org/10.3390/ma14123218
Submission received: 28 April 2021 / Revised: 25 May 2021 / Accepted: 7 June 2021 / Published: 10 June 2021
(This article belongs to the Special Issue The Research of Inorganic Nanomaterials)
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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.
Keywords: Al2O3; Cr2O3; Cr; CrAlO3; spinel; reduction process Al2O3; Cr2O3; Cr; CrAlO3; spinel; reduction process

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MDPI and ACS Style

Shtyka, O.; Maniukiewicz, W.; Ciesielski, R.; Kedziora, A.; Shatsila, V.; Sierański, T.; Maniecki, T. The Formation of Cr-Al Spinel under a Reductive Atmosphere. Materials 2021, 14, 3218. https://doi.org/10.3390/ma14123218

AMA Style

Shtyka O, Maniukiewicz W, Ciesielski R, Kedziora A, Shatsila V, Sierański T, Maniecki T. The Formation of Cr-Al Spinel under a Reductive Atmosphere. Materials. 2021; 14(12):3218. https://doi.org/10.3390/ma14123218

Chicago/Turabian Style

Shtyka, Oleksandr, Waldemar Maniukiewicz, Radoslaw Ciesielski, Adam Kedziora, Viktar Shatsila, Tomasz Sierański, and Tomasz Maniecki. 2021. "The Formation of Cr-Al Spinel under a Reductive Atmosphere" Materials 14, no. 12: 3218. https://doi.org/10.3390/ma14123218

APA Style

Shtyka, O., Maniukiewicz, W., Ciesielski, R., Kedziora, A., Shatsila, V., Sierański, T., & Maniecki, T. (2021). The Formation of Cr-Al Spinel under a Reductive Atmosphere. Materials, 14(12), 3218. https://doi.org/10.3390/ma14123218

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