Ln2MoO6-type rare earth molybdates—Preparation and lattice parameters

The title compounds have been prepared for Ln = rare earth elements 58 (Ce) through 71 (Lu) as well as Y and La. They fall into three structural categories: the tetragonal I42m space group for the large ions up to and including Sm2MoO6, which can also crystallize in the C2c symmetry found for the small rare earths; and an Fm3m related structure for Ce2MoO6, which constitutes an exception in the series. Cell parameters are also given for Gd2WO6 and a series of Gd2−xBixMoO6 solid solutions.