National Synchrotron Light Source Seminar

"Structural Trends in oxygen vacancy ordered perovskite La1 - xSrxMnOy compounds"

Presented by Leopoldo Suescun, University of Uruguay, school of Chemistry, Crystallography, Sokid State and Materials Laboratory, Uruguay

Tuesday, April 14, 2009, 2:00 pm — Seminar Room, Bldg. 725

Manganites are among the most frequently studied materials nowadays. In these compounds coupling between structural, orbital and magnetic degrees of freedom can be fully appreciated. When an extra degree of freedom, the chemical composition, is added additional complexities arises in the system. Oxygen vacancy formation may lead to different structures, either by an average distortion of the perovskite network for disordered vacancies or a complete structural rearrangement with ordered vacancies. We have performed a structural and magnetic characterization of manganites of general formula La1-xSrxMnOy (0≤x≤0.5, 2.5 In this talk we will describe the structural results obtained and the current understanding of vacancy ordering processes in perovskite manganites.

A very short summary of the relevance and partial results obtained during my stay at the NSLS regarding the current project on metal-organic frameworks (MOFs) under development with Jun Wang will also be presented after t

Hosted by: Jun Wang

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