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2024
ACL
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X.Zhang, C.Genevois, C.Li, X.Yang, M.J.Pitcher, M.Allix, X.Kuang, A.J.Fernández-Carrión, 'Topotactic Reduction-Induced Stabilization of β-La2Mo2O8.68 Phase: Structure, Static Oxygen Disorder, and Electrical Properties', Inorg. Chem. 63 22667 (2024) doi:10.1021/acs.inorgchem.4c02151
La2Mo2O9 is acknowledged as an exceptional oxide ion conductor. It
undergoes a reversible phase transition around 580 °C from the nonconductive lowtemperature
monoclinic α-La2Mo2O9 phase to the highly conductive high-temperature
cubic β-La2Mo2O9 phase. In addition, La2Mo2O9 demonstrates complex chemistry under
reducing conditions. This study reports, for the first time, the stabilization at ambient
temperature of a novel cubic phase through a topotactic reduction of α-La2Mo2O9
employing CaH2. This phase contains approximately ∼3 atom % oxygen vacancies
relative to the nominal composition (La2Mo2O8.68(1)). The cubic symmetry is associated with a static distribution of these vacancies,
in contrast to the dynamic distribution observed in the high-temperature cubic β-La2Mo2O9 phase reported previously. Additionally,
the material exhibits mixed-ion-electronic conduction, which expands its potential use in applications requiring both ionic and
electronic transport.
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