Infinitely Adaptive Transition Metal Oxychalcogenides: The Modulated Structures of Ce<sub>2</sub>O<sub>2</sub>MnSe<sub>2</sub> and (Ce<sub>0.78</sub>La<sub>0.22</sub>)<sub>2</sub>O<sub>2</sub>MnSe<sub>2</sub>
Chemistry of materials