New crystallographic shear families derived from the rutile structure, and the possibility of continuous ordered solid solution

A number of new families of titanium and mixed titanium plus chromium oxides has been discovered, their structures all being derived from the rutile type by crystallographic shear. Different families have different CS planes (hkl), and the members of a family are distinguished by the spacing of these planes. All the structures may be described as ordered intergrowths of (121) CS and (011) APB structures, with uniform mixing. The very small intervals between the compositions of the many phases suggest that virtually continuous but ordered solid solutions are possible.