High average solids properties from

Table 6.16 Average solids properties from high-temperature Winkler (HTW) fluid-bed gasification [137],...

If the local structure deviates from the average structure, the crystal symmetry is usually broken and the symmetry is lowered. For instance, the local symmetry may be rhombohedral or tetragonal but if the direction of the axes vary randomly from site to site, the system would appear cubic as a whole. Then, even though the crystal structure is cubic, the solid would have many properties reflecting the lower local symmetry, such as the mixing of the Raman and IR active modes and non-cubic crystal-field effects. Many high-symmetry solids are of this type as we will see later. 

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