PREPARATION AND PECULIARITIES OF TWO-SLAB INDATES BaNd2−xSmxIn2O7 FORMATION
DOI:
https://doi.org/10.15407/dopovidi2023.03.082Keywords:
compounds of An+1BnO3n+1 type, mechanism of formation, slab perovskite-like structureAbstract
The main regularities of isovalent substitution effect of A-position atoms in the slab perovskite-like structure of BaNd2In2O7 indate on the formation mechanisms of two-slab phases BaNd2−xSmxIn2O7 type (х = 0, 1, 1.6 and 1.8) have been established using X-ray powder diffraction methods. It has been demonstrated that the staging mechanisms of formation and the sequence of phase transformations are determined by both the composition and the degree of substitution of neodymium atoms. It has been determined that the formation of a highly ordered slab structure of BaNd2−xSmxIn2O7 (x = 0 and 1) occurs at T > 1570 K through the structural transformation of an intermediate three-dimensional defective perovskite with a the general composition of (BayLnz)InO3−d, which exhibits a statistical distribution of Ba, Ln atoms, and oxygen vacancies. The formation of the two-slab BaNd2−xSmxIn2O7 (x = 1.6 and 1.8) occurs in two mechanisms: by the interaction of defective rhombic perovskite (BayLnz)InO3−d with the intermediate phase Ba(In,Sm,Nd)O4 and by structural transformation of the defective perovskite
(BayLnz)InO3−d. The optimal conditions for synthesizing single-phase BaNd2−xSmxIn2O7 with a two-slab perovskite-like structure were determined.
Downloads
References
Kato, S., Ogasawara, M., Sugai, M. & Nakata, S. (2002). Synthesis and oxide ion conductivity of new layered perovskite La1–xSr1+xInO4–d. Solid state ionics, 149, No. 1-2, pp. 53-57. https://doi.org/10.1016/S0167-2738(02)00138-8
Schaak, R. E. & Mallouk, T. E. (2002). Perovskites by design: a toolbox of solid-state reactions. Chem. Mater., 14, No. 4, pp. 1455-1471. https://doi.org/10.1021/cm010689m
Xiao, H., Liu, P., Wang, W., Ran, R., Zhou, W. & Shao, Z. (2020). Ruddlesden–Popper perovskite oxides for photocatalysis-based water splitting and wastewater treatment. Energy Fuels, 34, No. 8, pp. 9208-9221.
https://doi.org/10.1021/acs.energyfuels.0c02301
Ding, P., Li, W., Zhao, H., Wu, C., Zhao, L., Dong, B. & Wang, S. (2021). Review on Ruddlesden–Popper perovskites as cathode for solid oxide fuel cells. J. Phys. Mater., 4, No. 2, 022002. https://doi.org/10.1088/2515-7639/abe392
Rao, C. N. R. & Raveau, B. (1998). Transition metal oxides: structure, properties, and synthesis of ceramic oxides. New York, Chichester, Wemheim: Villey-VCH.
Titov, Yu., Nedilko, S. G., Chornii, V., Scherbatskii, V., Belyavina, N., Markiv, V. & Polubinskii, V. (2015). Crystal structure and luminescence of layered perovskites Sr3LnInSnO8. Solid State Phenom., 230, pp. 67-72.
https://doi.org/10.4028/www.scientific.net/SSP.230.67
Titov, Y., Belyavina, N., Slobodyanik, M., Nakonechna, O., Strutynska, N. & Tymoshenko, M. (2020). Effect of isovalent substitution on the crystal structure and properties of two-slab indates BaLa2–xSmxIn2O7. Open Chem., 18, No. 1, pp. 1294-1303. https://doi.org/10.1515/chem-2020-0090
Titov, Y. O., Slobodyanik, M. S. & Krayevska, Ya. A. (2011). Peculiarities of mechanisms formation of slab indates AIILanInnO3n+1 (AII = Sr, Ba) from the systems of co-crystallized nitrates. Ukr. Khim. Zhurn., 77, No. 6, pp. 73-76 (in Ukrainian).
Titov, Y. O., Slobodyanik, M. S., Krayevska, Ya. A. & Chumak, V. V. (2008). Peculiarities of formation of slab scandates (SrO)(LaScO3)n from the systems of co-precipitated hydroxy-oxalates and crystallized nitrates. Ukr. Khim. Zhurn., 74, No. 9, pp. 34-39 (in Ukrainian).
Titov, Y. O., Slobodyanik, M. S., Krayevska, Ya. A. & Chumak, V. V. (2010). Peculiarities of mechanisms formation of slab scandates SrLnnScnO3n+1 from the systems of co-crystallized nitrates. Ukr. Khim. Zhurn., 76, No. 5, pp. 11-16 (in Ukrainian).
Dashevskyi, M., Boshko, O., Nakonechna, O. & Belyavina, N. (2017). Phase transformations in equiatomic Y—Cu powder mixture at mechanical milling. Metallofiz. Noveishie Tekhnol., 39, No. 4, pp. 541-552. https://doi.org/10.15407/mfint.39.04.0541
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2023 Reports of the National Academy of Sciences of Ukraine
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
