Date of Award
Alkali metal halide layers were constructed within Dion-Jacobson (DJ) layered perovskites by a two-step sequential intercalation method. Reductive intercalation with an alkali metal, followed by oxidative intercalation with chlorine gas, leads to the formation of compounds of the general formula, (A2Cl)LaNb2O7 (A = Rb, Cs). Rietveld refinement of X-ray powder diffraction data shows that an alkali metal halide layer is formed between the perovskite blocks. The alkali metal cation is eight-coordinate with 4 oxygens from the perovskite layer and 4 chlorides from the new halide layer; this environment is similar to cesium in the CsCl structure. Thermal analysis indicates that these are low-temperature phases where decomposition begins below 200°C. Details on the synthesis and characterization of this set of compounds are presented and the general utility of this approach discussed.
Zhang, Xiao, "Building Metal-Anion Layers within a Preovskite Host" (2006). University of New Orleans Theses and Dissertations. 415.