Abstract
AbstractExploring 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−xSmxIn2O7 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−xSmxIn2O7 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−xSmxIn2O7 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−xSmxIn2O7 were considered in terms of the crystal field effect.
Highlights
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
Preparation of the initial charge of co-crystallized salts for the subsequent synthesis of BaLa2−xSmxIn2O7 polycrystalline indates was carried out by co-crystallization of the mixture of barium acetate, lanthanum, samarium, and indium nitrates aqueous solution (the ratio is equal to Ba:La:Sm:In = 1:2 – x:x:2) with further thermal treatment of the product obtained with a gas–jet to remove the main part of the nitrogen oxides
The effect of isovalent substitution of lanthanum by samarium atoms in BaLn2In2O7 indate with the formation of BaLa2−xSmxIn2O7 solid solution (0 ≤ x ≤ 1.8) and features of this slab perovskite-like structure (SPS) are defined
Summary
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−xSmxIn2O7 indates synthesized. The aim of present research was to study the conditions of La/Sm isovalent substitution in a two-slab BaLa2In2O7 SPS and to determine its effect on the structural features and magnetic properties of isovalently substituted BaLa2−xSmxIn2O7 indates synthesized. To completely characterize this system, the present paper includes a systematic study of conditions of polymorphous substitution, crystal structure, and magnetic properties of BaLa2−xSmxIn2O7 samples. The study of the Ln/LnI substitution is a venture into the theory of the formation of Bacontaining An+1BnO3n+1 compounds with SPS and is of apparent interest for understanding the composition/ structure/features correlation for other representatives of oxide compounds with perovskite structure
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