Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX 78249, USA.
Sci Rep. 2017 Apr 18;7:46184. doi: 10.1038/srep46184.
Controlling oxygen content in perovskite oxides with ABO structure is one of most critical steps for tuning their functionality. Notably, there have been tremendous efforts to understand the effect of changes in oxygen content on the properties of perovskite thin films that are not composed of cations with multiple valance states. Here, we study the effect of oxygen vacancies on structural and electrical properties in epitaxial thin films of SrFeO (SFO), where SFO is a compound with multiple valance states at the B site. Various annealing treatments are used to produce different oxygen contents in the films, which has resulted in significant structural changes in the fully strained SFO films. The out-of-plane lattice parameter and tetragonality increase with decreasing oxygen concentration, indicating the crystal structure is closely related to the oxygen content. Importantly, variation of the oxygen content in the films significantly affects the dielectric properties, leakage conduction mechanisms, and the resistive hysteresis of the materials. These results establish the relationship between oxygen content and structural and functional properties for a range of multivalent transition metal oxides.
控制具有 ABO 结构的钙钛矿氧化物中的氧含量是调整其功能的最关键步骤之一。值得注意的是，人们已经付出了巨大的努力来理解氧含量变化对不包含多价态阳离子的钙钛矿薄膜性能的影响。在这里，我们研究了氧空位对外延薄膜 SrFeO（SFO）的结构和电学性能的影响，其中 SFO 是 B 位具有多价态的化合物。各种退火处理用于在薄膜中产生不同的氧含量，这导致完全应变的 SFO 薄膜发生了显著的结构变化。随着氧浓度的降低，面外晶格参数和四方度增加，表明晶体结构与氧含量密切相关。重要的是，薄膜中氧含量的变化显著影响材料的介电性能、漏导机制和电阻滞后。这些结果为一系列多价过渡金属氧化物建立了氧含量与结构和功能特性之间的关系。
