The Formation of Cr-Al Spinel under a Reductive Atmosphere
Open Access
- 10 June 2021
- Vol. 14 (12), 3218
- https://doi.org/10.3390/ma14123218
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.This publication has 35 references indexed in Scilit:
- Fundamentals and applications on in situ spinel formation mechanisms in Al2O3–MgO refractory castablesCeramics International, 2012
- A consistent and accurate ab initio parametrization of density functional dispersion correction (DFT-D) for the 94 elements H-PuThe Journal of Chemical Physics, 2010
- Preparation, microstructures and properties of Al2O3–TiC compositesCeramics International, 2002
- Structure and Stability of Aluminum Hydroxides: A Theoretical StudyThe Journal of Physical Chemistry B, 2002
- Corrosion Resistance of Alumina-Chromia Ceramic Materials Against Molten SlagMATERIALS TRANSACTIONS, 2002
- Reaction Mechanism in Alumina/Chromia (Al2O3–Cr2O3) Solid Solutions Obtained by CoprecipitationJournal of the American Ceramic Society, 2000
- Indexing of powder diffraction patterns for low-symmetry lattices by the successive dichotomy methodJournal of Applied Crystallography, 1991
- Epitaxial Growth of Spinel by Reaction in the Solid StateJournal of the American Ceramic Society, 1963
- Preparation and Properties of Spinel Made by Vapor Transport and Diffusion in the System MgO‐Al2O3Journal of the American Ceramic Society, 1961
- Mechanism of Solid‐state Reaction Between Magnesium Oxide and Aluminum Oxide and Between Magnesium Oxide and Ferric OxideJournal of the American Ceramic Society, 1961