Oxides with a tunnel structure characterized by a mixed framework of octahedra and tetrahedra
Oxides with a three-dimensional mixed framework built up from octahedra and tetrahedra are attractive owing to the possibility of forming large tunnels which can intersect as in the ionic conductors, or also to build anisotropic electronic conductors. The structural relationships between these oxides are analyzed here. Three classes of oxides are mainly studied here: mixed frameworks with tetrahedral silicate and germanate groups, oxides in which tetrahedral phosphates are involved and compounds involving silicophosphate groups. Other examples of mixed frameworks such as those involving GaO4 tetrahedra and NbO4 tetrahedra are also described.
Volume 134, 2022
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