Compounds that belong to the perovskite family exhibit remarkable versatility, both in terms of their chemical composition and their physical properties. Not only can one prepare perovskites containing elements ranging from hydrogen to plutonium, the physical properties of perovskites are incredibly varied. Superconductivity, ferrolectricity, piezoelectricity, ferromagnetism, antiferromagnetism, colossal magnetoresistance, half-metallicity, proton conductivity can all be found in members of the perovskite family. In this talk I will explore the synthesis, structure and properties of two families of complex perovskites: A3MO3F3 (A = Na, K, Rb, Ag; M = Mo, W) and ALnMM'O6 (A = Li, Na, K, Ln = rare-earth cation). In both families a combination of synchrotron X-ray powder diffraction, neutron powder diffraction and electron diffraction are used to reveal complex rotations of the octahedra. The compounds discussed have a variety of interesting properties ranging from ferroelectricity, magnetism and luminescence.  Relationships between structure and properties will be discussed.

Crystallographic studies of complex perovskites

247th National Meeting (2014)

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