Comprehensive survey of Nd3+ substitution In La2Mo2O9 oxide-ion conductor

Differential thermal analysis coupled to temperature-controlled diffraction have given evidence of a topological metastability phenomenon in an extended compositional range of the La2−xNdxMo2O9 solid solution. A metastable–stable phase diagram is proposed for this series of LAMOX-type fast oxide-ion conductors. In the Nd range 0

Metastable–stable phase diagram of the solid solution La2−xNdxMo2O9 determined from DTA. The topological metastability of the high-temperature cubic β-form which goes back to monoclinic stable α-form above 450–500 °C is shown in the intermediate range 0.4⩽x⩽1.2. Above x=1.2, this transition progressively changes into a thermal trace of the postulated Arrhenius/VTF transformation of transport mechanism.Figure optionsDownload as PowerPoint slide