| Magnesium Aluminate Spinel: Structure, Properties,
Synthesis and Applications |
Somnath Sinhamahapatra*, Paromita Das, Kausik Dana and Himanshu Shekhar Tripathi
Pages : 97-120
DOI : 10.1080/0371750X.2022.2137701 |
| Abstract |
| Magnesium aluminate (MA) is a spinel group of material and rarely available in nature.
It exhibits several advantageous thermal, thermo-mechanical, optical, chemical
properties which renders it suitable for wide gamut applications starting from refractory
to sensor to IR transmitting window. It has face centered cubic structure and has
wide solubility to its end members at elevated temperatures. As a result of this
solubility, non-stoichiometric compositions exist in the phase field of spinel in the
phase diagram. Due to its unavailability in nature, MA spinels are synthetically prepared
through different routes and using different starting materials. Among these, solid
state reaction sintering or conventional mixed oxide (CMO) method is the most technoeconomical
viable process. However, the challenge lies with the preparation of dense
MA spinel from its oxide precursors in a single stage process is the expansion due to
spinellization. Several attempts have been made to overcome this deterring factor
through improving the reactivity of the precursors, by controlling the processing
parameters, or by using the mineralizers. In this paper crystal structure, stoichiometry
in spinel composition, mechanism of spinel formation, different synthesis method,
properties and applications are reviewed.
[Keywords: Magnesium aluminate spinel, Synthesis, Refractory, Solid state reaction] |
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