Abstract Exploring the effect of isomorphic substitution of atoms on crystal structure and features of oxide compounds is one of the main tasks of modern materials science. This paper deals with the La/Sm isovalent substitution in a two-slab perovskite-like BaLa2In2O7 structure and its effect on the structural features and magnetic properties of BaLa2−x Sm x In2O7 indates synthesized. A complete characterization including data of scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), structural calculations (Rietveld method), second optical harmonic generation of the laser radiation, calculations of valence bond sums (VBS), and magnetic susceptibility data of phases obtained is presented. The existence region of BaLa2−x Sm x In2O7 solid solutions with a two-slab perovskite-like structure (0 ≤ x ≤ 1.8) was established, and their coordinate parameters were refined. The character of barium and RE atoms distribution in BaLa2−x Sm x In2O7 structure has determined, and the correlation between substitution degree of lanthanum atoms and the length of Ln–O2 interblock distance has revealed. The magnetic properties of BaLa2−x Sm x In2O7 were considered in terms of the crystal field effect.

中文翻译：

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等价取代对双板状铟酸盐 BaLa2−xSmxIn2O7 晶体结构和性能的影响

摘要 探索原子的同构取代对氧化物晶体结构和特征的影响是现代材料科学的主要任务之一。本文研究了两层钙钛矿类 BaLa2In2O7 结构中的 La/Sm 等价取代及其对合成的 BaLa2−x Sm x In2O7 铟酸盐结构特征和磁性能的影响。完整的表征包括扫描电子显微镜 (SEM)、能量色散 X 射线光谱 (EDS)、X 射线衍射 (XRD)、结构计算（Rietveld 方法）、激光辐射的二次光学谐波生成、计算提供了价键和 (VBS) 和所获得的相的磁化率数据。BaLa2−x Sm x In2O7 固溶体的存在区域，具有两层钙钛矿状结构 (0 ≤ x ≤ 1. 8) 建立，并细化它们的坐标参数。BaLa2−x Sm x In2O7 结构中钡和稀土原子的分布特征已经确定，镧原子的取代度与Ln-O2 块间距离长度之间的相关性已经揭示。BaLa2-x Sm x In2O7 的磁性是根据晶体场效应考虑的。