We report the synthesis and characterization of as-grown SrFe_xMn_1–xO_2.5 epitaxial films, which were also subjected to postgrowth oxidation and topotactic fluorination to obtain SrFe_xMn_1–xO₃ and SrFe_xMn_1–xO_2.5−δF_γ films. We show how both the B-site cation and anion composition influence the structural, electronic, and optical properties of this family of perovskite materials. The Fe substitution of Mn in SrMnO_2.5 gradually expands the c-axis parameter, as indicated by X-ray diffraction. With increasing x, the F content incorporated under identical fluorination conditions increases, reaching its maximum in SrFeO_2.5−δF_γ. In the compounds with mixed B-site occupation, the Fe 2p photoemission peaks are shifted upon fluorination, while the Mn 2p peaks are not, suggesting inductive effects lead to asymmetric responses in how F alters the Mn and Fe bonds. Electronic transport measurements reveal all compounds are insulators, with the exception of SrFeO₃, and demonstrate that fluorination increases resistivity for all values of x. Optical absorption spectra in the SrFe_xMn_1–xO_2.5 and SrFe_xMn_1–xO₃ films evolve systematically as a function of x, consistent with a physical scenario in which optical changes with Fe substitution arise from a linear combination of Mn and Fe 3d bands within the electronic structure. In contrast, the F incorporation induces nonlinear changes to the optical response, suggesting a more complex impact on the electronic structure in materials with concurrent B-site and anion site substitution.

中文翻译：

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SrFexMn1-x（O，F）3-δ氧化物（δ= 0和0.5）和氟氧化钙钛矿薄膜的合成与表征。

我们报告了成膜的SrFe _x Mn _{1- x} O _2.5外延膜的合成和表征，该膜还经过了生长后氧化和全氟化，以获得SrFe _x Mn _{1- x} O ₃和SrFe _x Mn _{1- x} O _{2.5 -δ} ˚F _γ膜。我们展示了B位阳离子和阴离子成分如何影响该钙钛矿材料系列的结构，电子和光学性质。SrMnO _2.5中Mn的Fe取代逐渐扩展了c轴参数，如X射线衍射所示。随着X，所述F含量下相同的氟化条件增加掺入，在SrFeO达到其最大_2.5-δ ˚F _γ。在具有混合B-位占据的化合物中，氟化时Fe 2p的光发射峰移动，而Mn 2p的峰不移动，这表明感应效应导致F如何改变Mn和Fe键的反应不对称。电子传输测量显示，除了SrFeO ₃以外，所有化合物都是绝缘体，并且证明氟化作用可提高所有x值的电阻率。SrFe _x Mn _{1– x} O中的光吸收光谱_2.5和SrFe _x Mn _{1– x} O ₃薄膜是x的系统演化，这与物理场景一致，在该物理场景中，随着电子结构中Mn和Fe 3d谱带的线性组合而产生的取代Fe的光学变化。相比之下，F的引入引起光学响应的​​非线性变化，这表明在同时存在B位和阴离子位取代的材料中，对电子结构的影响更为复杂。