Epitaxial Strain-Induced Chemical Ordering in La0.5Sr0.5CoO3−δ Films on SrTiO3
Citations Over TimeTop 10% of 2011 papers
Abstract
Fast ion conductors are at the foundation of a number of important technologies, ranging from fuel cells to batteries to gas separators. Recent results suggest that strained interfaces and thin films may offer new mechanisms for achieving enhanced ionic transport. In this work, we investigate strained 40-nm films of perovskite La0.5Sr0.5CoO3−δ, which is an important material for solid oxide fuel cell cathodes and oxygen separation membranes. We demonstrate that a strained thin film of La0.5Sr0.5CoO3−δ on SrTiO3 can have dramatically different anion and cation thermodynamics and kinetics than bulk La0.5Sr0.5CoO3−δ. We use synchrotron X-ray diffraction to show that La0.5Sr0.5CoO3−δ thin films form an ordered phase at 650 K. The ordered phase consists of La and Sr cations in planes parallel to the surface and is associated with coherent expansion in the c-direction of ∼5%. This chemical ordering is not observed in the bulk material and is ascribed to the interplay between the epitaxial strain imposed by the substrate, changes in oxygen vacancy content and cation mobility, and the ordering of oxygen vacancies.
Related Papers
- → The role of synchrotron radiation in examining the self-assembly of crystalline nanoporous framework materials: from zeolites and aluminophosphates to metal organic hybrids(2010)46 cited
- → Induction Synchrotron(2010)1 cited
- → Epitaxial lateral overgrowth of semiconductor structures by liquid phase epitaxy(2005)5 cited
- → Fuel-Borne Catalyst와 Perovskite로 구성된 복합촉매 시스템에 의한 디젤 탄소입자상 물질의 연소반응: 반응성능과 Perovskite 촉매조성 (La1-x A′xBO3: A′ = K, Sr; 0 ≤ x ≤ 1; B = Fe, Cr, Mn)의 상관관계(2018)1 cited
- → ChemInform Abstract: The Role of Synchrotron Radiation in Examining the Self‐Assembly of Crystalline Nanoporous Framework Materials: From Zeolites and Aluminophosphates to Metal Organic Hybrids(2011)