Abstract
There are a large number of ionic compounds in which the crystal structure is determined largely by a close-packed lattice of the anions. The most familiar examples are found among the oxides, sulphides, and anhydrous halides. The anionic lattice has the power to accommodate a wide range of different cations in the largest interstices, not only to give stoichiometric compounds, but also to form the important category of non-stoichiometric compounds. Any given cation in the lattice is co-ordinated to several anions which frequently number four or six and are arranged in a near regular geometry. The electronic interaction of the cation with this environment can be described in terms of the ideas outlined in the previous chapters on electronic structure. However, although all cations of a given type may have the same co-ordination to the anion, the successive co-ordination spheres containing other cations may well be very different. It is this distinction between a stoichiometric ordered lattice, such as in FeF2, and a non-stoichiometric disordered lattice as in Co1−x Zn x Fe2O4 which results in important new phenomena.
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Gibb, T.C. (1976). Oxides and Related Systems. In: Principles of Mössbauer Spectroscopy. Studies in Chemical Physics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-3023-1_7
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DOI: https://doi.org/10.1007/978-1-4899-3023-1_7
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