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The spinel structure is very flexible with respect to the cations it can incorporate; there are over 100 known compounds. In particular, the A and B cations can mix! In other words, the composition with respect to one unit cell can be;
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www.tf.uni-kiel.de/matwis/amat/def_en/kap_2/basics/b2_1...
www.tf.uni-kiel.de/matwis/amat/def_en/kap_2/basics/b2_1_6.html
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The structure consist of a cubic closed-packed array of 32 oxide ions, which forms 64 tetrahedral holes and 32 octahedral holes in one unit cell (containing eight formula units (AB2O4)8).[1] There are two types of sub-cells commonly described for the spinel structure, here shown a structure a and structure b in Figures 1...
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wikis.lib.ncsu.edu/index.php/Spinel
wikis.lib.ncsu.edu/index.php/Spinel
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Magnetite, Fe 3O4, has the inverse spinel structure. An inverse spinel is ccp with trivalent cations occupying one-eighth of the Td holes and one-fourth of the Oh holes while divalent cations occupy one-fourth of the Oh holes.
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bilbo.chm.uri.edu/CHM501/Pfizer/set3-3.htm
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Hutchinson encyclopedia article about Spinel structure. Spinel structure. Information about Spinel structure in the Hutchinson encyclopedia. ... (redirected from Spinel structure)
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encyclopedia.farlex.com/Spinel+structure
encyclopedia.farlex.com/Spinel+structure
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It has been suggested that the crystal structure of cubic spinel compounds should be referred to the non-centrosymmetric space group F43m instead of the customary space group Fd3m. The need for the new assignment arises from the possibility of an off-centre displacement of the octahedrally coordinated cations.
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stacks.iop.org/0022-3719/9/L231
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A coherent mechanism for the transformation of olivine to its spinel structure polymorph has been investigated in Mg2GeO4 olivine at conditions ranging from 6 GPa to 18 GPa at 300 to 1250 °C using a multi-anvil apparatus.
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ammin.geoscienceworld.org/cgi/content/abstract/90/8-9/1...
ammin.geoscienceworld.org/cgi/content/abstract/90/8-9/1315
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Single-crystal infrared (IR) reflectance spectra were measured for synthetic Mg, Fe, Ni, or Co-bearing silicates with the spinel structure. Peak parameters (frequency, damping coefficient, and oscillator strength) were determined for the fundamentals, and for overtones, up to 3rd order.
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ammin.geoscienceworld.org/cgi/content/abstract/86/5-6/6...
ammin.geoscienceworld.org/cgi/content/abstract/86/5-6/622
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Xiete is the first new mineral with post-spinel structure found by a Chinese-American team from the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences and the Geophysical Laboratory, Carnegie Institution of Washington, which has recently been approved by the Commission on New Minerals,
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www.physorg.com/news140445049.html
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Crystal structure of the spinel MgAl2O4: view along the a+b direction. The yellow spheres represent the magnesium atoms, the gray ones the aluminium atoms and the red ones the oxygen atoms. ... Usage of Spinel structure.png on dewiki...
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commons.wikimedia.org/wiki/File:Spinel_structure.png
commons.wikimedia.org/wiki/File:Spinel_structure.png
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