Investigation of the Oxide Ion Conduction Mechanism in LaGaO3-Based Electrolytes through High-Temperature Neutron Powder Diffraction

Masahiro Kajitani; Motohide Matsuda; Akinori Hoshikawa; Takashi Kamiyama; Fujio Izumi; Michihiro Miyake

doi:10.4028/www.scientific.net/KEM.350.147

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Electrochemical Properties of Lithium Titanate Synthesized by Reassembly of Nanosheets
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CO₂ Absorption Properties of Barium Orthotitanate under Continuous Operation
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Investigation of the Oxide Ion Conduction Mechanism in LaGaO₃-Based Electrolytes through High-Temperature Neutron Powder Diffraction
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Investigation of the Oxide Ion Conduction Mechanism in LaGaO₃-Based Electrolytes through High-Temperature Neutron Powder Diffraction

Abstract:

The crystal structure and oxide ion conduction properties of La0.9Sr0.1Ga0.9Mg0.1O2.9 were compared with those of LaGa0.8Mg0.2O2.9 with the same oxygen vacancy concentration. Although La0.9Sr0.1Ga0.9Mg0.1O2.9 had a smaller free space through which oxide ions pass compared to LaGa0.8Mg0.2O2.9, the activation energy of oxide ion conduction in the former was lower. This was attributed to the large displacement of La and Ga in La0.9Sr0.1Ga0.9Mg0.1O2.9. The GaO6 octahedral tilts in the LaGaO3 perovskite structure were reduced by double doping with Sr and Mg. Reduction of the GaO6 octahedral tilt proved effective for oxide ion conduction.