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000902642 1001_ $$0P:(DE-Juel1)165826$$aCao, Lei$$b0$$eCorresponding author
000902642 245__ $$aMigration Kinetics of Surface Ions in Oxygen‐Deficient Perovskite During Topotactic Transitions
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000902642 520__ $$aOxygen diffusivity and surface exchange kinetics underpin the ionic, electronic, and catalytic functionalities of complex multivalent oxides. Towards understanding and controlling the kinetics of oxygen transport in emerging technologies, it is highly desirable to reveal the underlying lattice dynamics and ionic activities related to oxygen variation. In this study, the evolution of oxygen content is identified in real-time during the progress of a topotactic phase transition in La0.7Sr0.3MnO3-δ epitaxial thin films, both at the surface and throughout the bulk. Using polarized neutron reflectometry, a quantitative depth profile of the oxygen content gradient is achieved, which, alongside atomic-resolution scanning transmission electron microscopy, uniquely reveals the formation of a novel structural phase near the surface. Surface-sensitive X-ray spectroscopies further confirm a significant change of the electronic structure accompanying the transition. The anisotropic features of this novel phase enable a distinct oxygen diffusion pathway in contrast to conventional observation of oxygen motion at moderate temperatures. The results provide insights furthering the design of solid oxygen ion conductors within the framework of topotactic phase transitions.
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000902642 7001_ $$0P:(DE-Juel1)145895$$aPetracic, Oleg$$b1
000902642 7001_ $$0P:(DE-Juel1)145420$$aWei, Xian-Kui$$b2
000902642 7001_ $$0P:(DE-Juel1)180349$$aZhang, Hengbo$$b3
000902642 7001_ $$0P:(DE-Juel1)165376$$aDuchoň, Tomáš$$b4
000902642 7001_ $$0P:(DE-Juel1)130677$$aGunkel, Felix$$b5
000902642 7001_ $$0P:(DE-Juel1)158075$$aKoutsioumpas, Alexandros$$b6
000902642 7001_ $$0P:(DE-Juel1)177085$$aZhernenkov, Kirill$$b7
000902642 7001_ $$0P:(DE-Juel1)130926$$aRushchanskii, Konstantin Z.$$b8
000902642 7001_ $$0P:(DE-Juel1)166271$$aHartmann, Heinrich$$b9
000902642 7001_ $$0P:(DE-Juel1)168371$$aWilhelm, Marek$$b10
000902642 7001_ $$0P:(DE-HGF)0$$aLi, Zichao$$b11
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000902642 7001_ $$0P:(DE-Juel1)180455$$aHe, Suqin$$b13
000902642 7001_ $$0P:(DE-Juel1)172856$$aWeber, Moritz L.$$b14
000902642 7001_ $$0P:(DE-HGF)0$$aVeltruská, Kateřina$$b15
000902642 7001_ $$0P:(DE-Juel1)172029$$aStellhorn, Annika$$b16
000902642 7001_ $$0P:(DE-Juel1)130824$$aMayer, Joachim$$b17
000902642 7001_ $$0P:(DE-HGF)0$$aZhou, Shengqiang$$b18
000902642 7001_ $$0P:(DE-Juel1)130572$$aBrückel, Thomas$$b19
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