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• W2009274367 abstract "Abstract Demixing/recombination and metastability phenomena are observed in the La 2–2 x Ca 2 x Mo 2 O 9– x solid solutions ofLAMOX‐type fast oxide‐ion conductors (0.005 ≤ x ≤ 0.05). The demixing process is more visible at high Ca content. The effects of composition, sample shape (powders with twodegrees of fineness, ceramic pellets, single crystals) and thermal history are studied by using high‐temperature X‐ray diffraction, differential scanning calorimetry (DSC) and polarized microscopy. All these parameters are shown to have an influence on the stability of, and transformations between, the ordered α and the disordered β forms of the LAMOX compounds. Powder samples with low Ca content ( x = 0.01, 0.02) have been stabilized in the α form, and powder samples with higher Ca content ( x = 0.03, 0.04, 0.05) are in the β form. Upon heating, the low‐Ca‐content compounds ( x = 0.01 and x = 0.02) exhibit the α/β transition, whereas those with higher Ca content ( x = 0.03 and x = 0.04) show a succession of β/α/β phase transformations (metastability of the β form). The compound with the highest Ca content ( x = 0.05) remains in the β form over the whole thermal range. Upon cooling, all samples exhibit the β/α phase transition. When x = 0.04, powder annealing suppresses all the phase transformations upon heating, but not the β/α transition upon cooling, whereas sample shaping/sintering as a pellet stabilizes the β form over the whole thermal range upon heating and cooling. Single crystals with compositions x = 0.005 and x = 0.025 can be obtained either in the α or in the β form by slow cooling or by quenching, respectively. In these oxide‐ion conductors with a high concentration of point defects, internal or external stress appears to strongly affect the vacancy equilibrium but not the demixing/recombination phenomenon.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)" @default.
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• W2009274367 date "2008-03-28" @default.
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• W2009274367 title "Complex Effect of Partial Substitution of La ³⁺ by Ca ²⁺ on the Stability of Fast Oxide‐Ion Conductor La ₂ Mo ₂ O ₉" @default.
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• W2009274367 doi "https://doi.org/10.1002/ejic.200701175" @default.
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