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Crystal structure, thermal and electrotransport properties of NdBa1–xSrxFeCo0.5Cu0.5O5+δ (0.02 ≤ x ≤ 0.20) solid solutions

A. I. Klyndyuk, Ya. Yu. Zhuravleva, N. N. Gundilovich

Abstract


Using solid-state reactions method, the solid solutions of layered oxygen-deficient perovskites NdBa1–xSrxFeCo0.5Cu0.5O5+δ (0.02 ≤ x ≤ 0.20) were prepared; their crystal structure, thermal stability, thermal expansion, electrical conductivity and thermopower were studied. It was found that NdBa1–xSrxFeCo0.5Cu0.5O5+δ phases crystallize in tetragonal syngony (space group P4/mmm) and are p-type semiconductors, whose conductivity character at high temperatures changed to the metallic one due to evolution from the samples of so-called weakly-bonded oxygen. Partial substitution of barium by strontium in NdBaFeCo0.5Cu0.5O5+δ leads to the small decreasing of unit cell parameters, thermal stability and thermopower of NdBa1–xSrxFeCo0.5Cu0.5O5+δ solid solutions, increasing of their electrical conductivity values and slightly affects their linear thermal expansion coefficient and activation energy of electrical transport values.

Keywords


layered perovskites; thermal stability; thermal expansion; electrical conductivity; thermo-EMF

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References


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DOI: https://doi.org/10.15826/chimtech.2021.8.3.01

Copyright (c) 2021 A.I. Klyndyuk, Ya.Yu. Zhuravleva, N.N. Gundilovich

© Chimica Techno Acta, 2014-2021
ISSN 2411-1414 (Online)

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