Topotactic Reduction-Induced Stabilization of β-La 2 Mo 2 O 8.68 Phase: Structure, Static Oxygen Disorder, and Electrical Properties - Archive ouverte HAL
Article Dans Une Revue Inorganic Chemistry Année : 2024

Topotactic Reduction-Induced Stabilization of β-La 2 Mo 2 O 8.68 Phase: Structure, Static Oxygen Disorder, and Electrical Properties

Résumé

La₂Mo₂O₉ is acknowledged as an exceptional oxide ion conductor. It undergoes a reversible phase transition around 580°C from the non-conductive low-temperature 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 -La2Mo2O9 employing CaH₂. This phase contains approximately ~3 at% 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 -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.
Fichier sous embargo
Fichier sous embargo
0 10 27
Année Mois Jours
Avant la publication
mercredi 19 novembre 2025
Fichier sous embargo
mercredi 19 novembre 2025
Connectez-vous pour demander l'accès au fichier

Dates et versions

hal-04807217 , version 1 (27-11-2024)

Licence

Identifiants

Citer

Xueting Zhang, Cecile Genevois, Cheng Li, Xiaoyan Yang, Michael J Pitcher, et al.. Topotactic Reduction-Induced Stabilization of β-La 2 Mo 2 O 8.68 Phase: Structure, Static Oxygen Disorder, and Electrical Properties. Inorganic Chemistry, 2024, ⟨10.1021/acs.inorgchem.4c02151⟩. ⟨hal-04807217⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

More