We are currently investigating the stability of the perovskite-derived, infinite layer structure (SrFeO2) (See Fig. 1). The purpose is to understand the nature of oxide conductivity and oxygen reduction of these phases, all important for use in applications, such as electrolytes in solid oxide fuel cells. SrFeO2 is formed by the topotactic reduction of the perovskite SrFeO3-x with CaH2. We have completed initial thermal stability studies using in situ X-ray diffraction to characterize the conversion of the infinite layer phase to the brownmillerite phase, Sr2Fe2O5-d, under vacuum, air, and inert conditions (See Fig. 1).   A related project includes the reduction of Sr2FeMoO6 (structure shown in Fig. 2).We will synthesize Sr2FeMoO6 using a sol-gel method, and reduce it using similar methods to those described for SrFeO3-x, and study its various properties using X-ray and neutron diffraction, and a SQUID magnetometer.?

Iron-based perovskite derivatives: Studies of stability, magnetism, and oxide conductivity

247th National Meeting (2014)

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