College Park, Maryland      June 6 - 10 , 2004

TP15: Studies on long range and short range ordering in Y-doped La2Zr2O7

E.A. Payzant, S.A. Speakman, R.D. Carneim, T.R. Armstrong (Oak Ridge National Laboratory, Oak Ridge, TN), T.E. Proffen ( Los Alamos National Laboratory, Los Alamos, NM)

Selected compositions in the La2Zr2O7-LaYO3 system have been produced using glycine-nitrate process, as potential candidate materials for gas separation membranes. Refinement of x-ray diffraction data from such materials cannot resolve the oxygen site positions and occupancies to sufficient precision because of the presence of high-Z scatterers such as La, Y, and Zr, yet this is precisely the information that is critical to explain the ion mobility. Neutron scattering data was acquired using the high-resolution total scattering neutron powder diffractometer NPDF at LANSCE. A combination of structural (i.e., Reitveld) and pair distribution (i.e., PDF) analyses of the diffraction data provide important insight into the property-structure relationships in these materials.

Research sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory (ORNL), managed by UT-Battelle, LLC for the U. S. Department of Energy under Contract No. DE-AC05-00OR22725. This work has benefited from the use of the Los Alamos Neutron Science Center at the Los Alamos National Laboratory. This facility is funded by the US Department of Energy under Contract W-7405-ENG-36.

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