Synthesis and crystal structure of two-slab Ba1-хSrxNd2In2O7 indates

Y.A. Titov; N.N. Belyavina; M.S. Slobodyanik; O.I. Nakonechna; N.Yu. Strutynska

doi:10.15330/pcss.23.2.375-379

Authors

Y.A. Titov Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
N.N. Belyavina Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
M.S. Slobodyanik Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
O.I. Nakonechna Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
N.Yu. Strutynska Taras Shevchenko National University of Kyiv, Kyiv, Ukraine

DOI:

https://doi.org/10.15330/pcss.23.2.375-379

Keywords:

slab perovskite-like structure, interblock distance, polyhedron deformation, compounds of An 1BnO3n 1 type

Abstract

The conditions of isovalent substitution of Barium atoms by Strontium atoms in the A-position of the BaNd₂In₂O₇ two-slab perovskite-like structure of Ba_1-xSr_xNdIn₂O₇ are established: 0 <=x<= 0.22. The tetragonal (P4₂/mnm) crystal structure of Ba_1-xSr_xNdIn₂O₇ phases with x = 0.1 and 0.2 was determined by the Rietveld method. Ba_1-xSr_xNdIn₂O₇ structure is based on two-dimensional (infinite in the XY plane) perovskite-like blocks of two slabs connected by vertices of deformed InO₆ octahedra. Neighboring blocks are separated by a layer of NdO₉ polyhedra and interconnected by O – Nd – O bonds. It is found that isovalent substitution of Barium atoms by Strontium atoms reduces the Nd – O2 interblock distance, which brings the structure of two-dimensional slab structure closer to the structure of three-dimensional perovskite and is one of the main factors of destruction of Ba_1-xSr_xNdIn₂O₇ slab structure at х > 0.2.

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