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Unusual structural phenomena have been observed through high temperature X-ray diffraction in fast oxide-ion conductor La 1.92 Ca 0.08 Mo 2 O 8.96 . A demixion process occurs above 640 °C, with calcium segregation leading to the formation of CaMoO 4 impurity. It recombines at higher temperature to reform the pure cubic LAMOX phase (β-type disordered form). In...
The thermal evolution of the crystal structure of the new fast oxide-ion conductor La 2 Mo 2 O 9 across its structural α to β first order transition at 580 o C has been followed using synchrotron X-ray diffraction (XRD). The influence on the transition, structure and oxide-ion conductivity of partial substitution by other rare earths (Nd, Gd, Y) is studied. For Nd substitution...
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