Structural theory for non-stoicheiometry. Part I. Defect fluorite-type structures: lanthanoid oxides MOx with 1·7 ⩽x⩽ 2·0
Abstract
The concept of an octahedrally co-ordinated anion vacancy □O6 is introduced to develop a rational structural theory for the known series of ordered non-stoicheiometric lanthanoid oxides of formula MnO2n–2(n= 7–∞). The resulting co-ordination defect (c.d.) has the composition M