Formation of two-slab Ba1–хSrxNd2In2O7 indates by thermal treatment of co-crystallized nitrates

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DOI:

https://doi.org/10.15407/dopovidi2023.02.076

Keywords:

compounds of An 1BnO3n 1 type, mechanism of formation, slab perovskite-like structure

Abstract

The sequence of phase transformations in the synthesis of Ba1–хSrxNd2In2O7 (x = 0, 0.2) indates with a two- dimensional two-slab perovskite-like structure from a charge of co-crystallized nitrates was studied by X-ray powder diffraction methods. It was found that the formation of the slab structure of Ba1–хSrxNd2In2O7 in- cludes the stage of formation intermediate three-dimensional defective perovskite of general composition (NdkВаpSrm)InO3–δ with the statistical distribution of Ba, Sr, Nd atoms and oxygen vacancies. Heat treatment of thermally unstable defective perovskite (NdkВаpSrm)InO3–δ leads to the formation of a two-slab Ba1–хSrxNd2In2O7 at T >1570 K by ordering the positions of Ba, Sr, Nd and O atoms with segregation of defective perovskite structure into two-dimensional two-slab perovskite-like blocks, which separated by NdO9 slabs. The conditions for obtaining single-phases Ba1–хSrxNd2In2O7 with a two-slab perovskite-like structure are established. Structural chemical differences between the mechanism of formation of the slab perovskite-like structure of Ba1–хSrxNd2In2O7 from mechanisms of most other two-slab compounds of the AII Ln2B2III O3n+1 type are due to the boundary position of BaNd2In2O7 in the row of two-slab indates BaNd2In2O7.

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Published

03.05.2023

How to Cite

Titov, Y. ., Slobodyanik, M. ., Chumak, V. ., & Strutynska, N. . (2023). Formation of two-slab Ba1–хSrxNd2In2O7 indates by thermal treatment of co-crystallized nitrates. Reports of the National Academy of Sciences of Ukraine, (2), 76–82. https://doi.org/10.15407/dopovidi2023.02.076

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