Oxygen mobility in a new Brownmillerite type oxideSr2-xBax(Sc,Ga)O5
Brownmillerite types oxides have an important role in the field of moderate temperature oxygen ion conductors. Based on our previous studies on brownmillerite framework structures, the prerequisite for low-temperature oxygen ion conduction is a result of the underlying lattice dynamics, revealing a phonon assisted diffusion mechanism, essentially relying on a dynamic oxygen disorder scenario of the infinite MO4 chains. In this sense the new compound Sr2-xBax(Sc,Ga)O5 can be considered a key compound to probe the influence of order-disorder phenomena for the ((Sc,Ga)O4)? chains on low temperature oxygen mobility properties. In fact, Neutron Powder Diffraction revealed a transition from an order of the ((Sc,Ga)O4)? chain at room temperature to a dynamically disorder state above 300°C. The aim of the proposed experiment is to investigate the influence of the order/disorder transition on the oxygen mobility with respect to changes in the lattice dynamics by studying the changes of the DOS of the title compound as a function of temperature on IN6
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CORALLINI Serena; CERETTI Monica; PAPET Philippe; PAULUS Werner; PIOVANO Andrea and ZBIRI Mohamed. (2012). Oxygen mobility in a new Brownmillerite type oxideSr2-xBax(Sc,Ga)O5. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-03-118
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