Anion order in new K2NiF4-type layered perovskite oxynitrides
Transition metal perovskite oxynitrides ABO3-xNx, formed by rare earth or alkaline earth cations at the A sites show colossal magnetoresistance, thermoelectricity, spontaneous polarization and visible light photocatalytic properties among other properties. Anion order in perovskite oxynitrides affects their physical properties and is directed by the differences in charge and electronegativity between the two anions. Layered perovskite oxynitrides of Ruddlesden-Popper type structure An+1BnO3n+1-xNx are known for few examples, but we have recently prepared the new n=1 compound Nd2TaO1.5N2.5 and Nd2AlO3N using a new synthetic route. The determination of N/O distribution in these layered compounds is important to understand the general principles of anion order in perovskite oxynitrides and to interpret their physical properties. We request 2 days on D20 to determine accurately the anion coordinates and to investigate the N/O order in Nd2TaO1.5N2.5 and Nd2AlO3N between 1.6-300 K. This will allow to determine possible symmetry lowering at low temperature and to settle the issues of structural symmetry and anion ordering in Ruddlesden-Popper oxynitrides.
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FUERTES Amparo; FRONTERA Carlos; Jhonatan R. Guarin; ORO Judith and RITTER Clemens. (2023). Anion order in new K2NiF4-type layered perovskite oxynitrides. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-790
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