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The various superstructure phases that occur with the anion-deficient compositions of binary oxides MO2 − x with the fluorite structure as parent are explored here in terms of the original `coordination defect' (or CD) concept in which each vacant oxygen site, □, is `coordinated' by six O atoms thereby creating the octahedral `structure-determining' entity [M3.5□O6]. It emerges that the structure and composition of each anion-deficient (polymorph) phase can be described in terms of crystallographic `motifs' which comprise sets of parallel coplanar polygons based on ½〈210〉F and ½〈111〉F CD linkages.

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