Structure of Spinel

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<jats:p>This paper reviews the crystal structure of compounds with the general formula AB<jats:sub>2</jats:sub>X<jats:sub>4</jats:sub>, which crystallize with the same atomic structure as the mineral spinel, MgAl<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>. Three degrees of freedom associated with the detailed atomic arrangements of spinels are considered here: (i) the lattice parameter, <jats:italic>a</jats:italic>; (ii) the anion parameter, <jats:italic>u</jats:italic>; and (iii) the cation inversion parameter, <jats:italic>i.</jats:italic> Oxide spinels are used as examples to explore the interrelationships between these parameters.</jats:p>

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