Anion Ordering to Induce Polar Metal Coordinations and Single Ion Anisotropies.

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Solid-state syntheses, reactions in fluxes, and chemical vapor transports will result in pure powders and single crystals of novel materials. The prime chemical aim is the general system AE-TM-Ch-O, with AE = Mg, Ca, Sr, Ba, TM = Ti-Zn, and Ch = S, Se, Te. To replace AE by alkali-metals or TM by selected 4d and 5d transition metals is a second aim in this project.From diffraction analysis techniques, particularly x-ray scattering, anion orderings and heteroleptic coordinations of cations are revealed through crystal structure determinations; the obtained inter-atomic distances offer estimations of local polarities at the cation sites. Further, these distances constitute the starting points for crystal field calculations.Subsequently, effects from heteroleptic cation coordinations on macroscopic properties are probed by thermodynamic, optic, as well as heat- and electron-transport investigations. More specifically, properties like non-linear optics, magnetoelectric effects, and single ion anisotropies are in focus.