Abstract
The relative stabilities of spinelloid polytypic modifications are analysed in terms of the relative magnitudes of the interaction energies between first, second and third neighbour structural modules. Structures which exhibit minimum interaction energies are deduced, and it is found that of all the possible polytypic modifications considered, only five spinelloid structures can possess a minimum value for the interaction energy between modules. It is shown that the spinelloid structures adopted in the system Ni2SiO4-NiAl2O4 can be satisfactorily analysed in terms of these interaction energies, and it is suggested that the dominant factors influencing the energy of interaction between structural units in this system are electrostatic charge imbalance effects. Strain energy effects, associated with cation size mismatch, however, appear to play a significant role in determining the behaviour of the analogous iron and cobalt systems.
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Price, G.D. Polytypism and the factors determining the stability of spinelloid structures. Phys Chem Minerals 10, 77–83 (1983). https://doi.org/10.1007/BF00309588
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DOI: https://doi.org/10.1007/BF00309588