Thermal, structural and transport properties of the fast oxide-ion conductors La2−xRxMo2O9 (R=Nd, Gd, Y)

摘要: Abstract The thermal evolution of the crystal structure new fast oxide-ion conductor La 2 Mo O 9 across its structural α to β first order transition at 580 °C has been followed using synchrotron X-ray diffraction (XRD). influence on transition, and conductivity partial substitution by other rare earths (Nd, Gd, Y) is studied. For Nd monoclinic form retained room temperature in whole compositional range. Gd Y substitutions, above a certain doping level, suppression phase stabilization cubic are achieved. structures 1.9 0.1 β-La 670 (revisited), both refined from neutron powder patterns, very similar. Despite cell volume reduction, lanthanide results 500 an increase anion compared that , which might result differences samples' relative density.