We have an ongoing interest in oxychalcogenide materials. In particular those with layered structures. Layered structures are commonly found due to the different bonding requirements of oxygen and chalcogen ions in mixed metal systems. Materials with these structures are of interest due to their magnetic properties, potential use in optical devices, and as hosts in alkali ion battery technology. One of the least studied families of oxychalcogenides is the A₂O₃M₂Q₂ family, where A = lanthanide ion, M = transition metal ion, Q = chalcogenide.

Synthetic studies on the A₂O₃M₂Q₂ family has provided a general overview of the range of the metal species for which this structure is stable. Variable temperature X-ray diffraction has shown that Pr₂O₃Mn₂Se₂ undergoes a structural transition at low temperatures (~150K) from a tetragonal to an orthorhombic unit cell. This transition is accompanied by ferromagnetic ordering of the moments within the structure when cooled the material in the presence of an applied magnetic field. There is also evidence for a similar structural transition in La­₂O₃Mn₂Se₂ at lower temperatures. This poster will report synthetic, structural and magnetic characterisation of these materials.

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2. Structures and phase transitions of Molybdenum Phosphates
3. Parametric refinement of in-situ XRPD data