Crystal structure, thermal and electrotransport properties of NdBa 1–x Sr x FeCo 0.5 Cu 0.5 O 5+δ  (0.02 ≤ x ≤ 0.20) solid solutions

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

doi:10.15826/chimtech.2021.8.3.01

Crystal structure, thermal and electrotransport properties of NdBa_1–xSr_xFeCo_0.5Cu_0.5O_5+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 NdBa_1–xSr_xFeCo_0.5Cu_0.5O_5+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 NdBa_1–xSr_xFeCo_0.5Cu_0.5O_5+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 NdBaFeCo_0.5Cu_0.5O_5+δ leads to the small decreasing of unit cell parameters, thermal stability and thermopower of NdBa_1–xSr_xFeCo_0.5Cu_0.5O_5+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

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

Abstract

Keywords

Full Text:

References

Crystal structure, thermal and electrotransport properties of NdBa_1–xSr_xFeCo_0.5Cu_0.5O_5+δ (0.02 ≤ x ≤ 0.20) solid solutions