EFFECT OF ISOVALENT SUBSTITUTION OF EUROPIUM WITH DYSPROSIUM ON THE SLAB STRUCTURE OF SrEu2−xDyxSc2O7 SCANDATES

Authors

DOI:

https://doi.org/10.15407/dopovidi2025.01.058

Keywords:

compounds of An+1BnO3n+1 type, slab perovskite-like structure, X-ray powder diffractometry, isomorphism

Abstract

The dimensions of the phase region with a slab perovskite-like structure in the SrEu2−xDyxSc2O7 system were determined: 0 ≤ х ≤ 0.5 and the crystal structure of the SrEu2−xDyxSc2O7 phases with x = 0.25 and 0.5 was determined using a program based on Rietveld algorithms for multiphase samples. It was established that SrEu2−xDyxSc2O7 samples with x = 0.25 and 0.5 contain two polymorphic modifications with a slab perovskite-like structure: a modification with rhombic syngonia (sp. group Fmmm) and modification with tetragonal syngonia (sp. group I4/mmm). The basis of the slab structure of both modifications of SrEu2−xDyxSc2O7 are two-dimensional perovskite-like blocks with a thickness of two slabs of deformed ScO6 octahedra, which connected by vertices. A slab of (Eu,Dy)O9 polyhedra is located between the blocks and the blocks are connected to each other by bonds —O—(Eu,Dy)—O—. It was established that the increase in the content of dysprosium atoms in SrEu2−xDyxSc2O7 leads to an increase in the degree of deformation of LnO9 interblock polyhedra and a decrease in the Ln—O2 interblock distance. This transformation of the structure destabilizes the interblock space and is one of the main factors in the destruction of the slab perovskite-like structure of SrEu2−xDyxSc2O7 phases at x > 0.5 and leads to the impossibility of SrDy2Sc2O7 scandate existence.

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Published

27.02.2025

How to Cite

Titov, Y., Belyavina, N., Slobodyanik, M., & Chumak, V. (2025). EFFECT OF ISOVALENT SUBSTITUTION OF EUROPIUM WITH DYSPROSIUM ON THE SLAB STRUCTURE OF SrEu2−xDyxSc2O7 SCANDATES. Reports of the National Academy of Sciences of Ukraine, (1), 58–67. https://doi.org/10.15407/dopovidi2025.01.058

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