Structural, Thermal, and Electrical Properties of Solid Solutions in the NdBaFeCo0.5Cu0.5O5+δ–NdSrFeCo0.5Cu0.5O5+δ System

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NdBa1–xSrxFeCo0.5Cu0.5O5+δ (0 ≤ x ≤ 1.0) layered perovskites have been prepared by solid-state reactions and their crystal structure, microstructure, and thermal and electrical properties have been studied. The materials with x ≤ 0.4 have a tetragonal structure (sp. gr. P4/mmm) and those in the range 0.6 ≤ x ≤ 1.0 have a cubic structure (sp. gr. Pm3m) and are p-type semiconductors, but with increasing temperature the behavior of their electrical conductivity changes to metallic one as a result of labile oxygen (δ) release, accompanied by an increase in their linear thermal expansion coefficient from (15.1–16.2) × 10–6 to (18.9–23.5) × 10–6 К–1. Increasing the degree of strontium substitution for barium reduces the unit-cell parameters and thermoelectric power of the NdBa1–xSrxFeCo0.5Cu0.5O5+δ solid solutions and increases their electrical conductivity. We have evaluated activation energy for electrical transport processes, weighted charge carrier mobility, and charge carrier concentration in the perovskites and demonstrated that these parameters vary nonmonotonically with the cation composition of the materials, having extrema in the region of the tetragonal-to-cubic structural phase transition.

作者简介

A. Klyndyuk

Belarussian State Technological University, 220006, Minsk, Belarus

Email: klyndyuk@belstu.by
Беларусь, 220006, Минск, ул. Свердлова, 13А

Ya. Zhuravleva

Belarussian State Technological University, 220006, Minsk, Belarus

Email: klyndyuk@belstu.by
Беларусь, 220006, Минск, ул. Свердлова, 13А

N. Gundilovich

Belarussian State Technological University, 220006, Minsk, Belarus

Email: klyndyuk@belstu.by
Беларусь, 220006, Минск, ул. Свердлова, 13А

E. Chizhova

Belarussian State Technological University, 220006, Minsk, Belarus

编辑信件的主要联系方式.
Email: klyndyuk@belstu.by
Беларусь, 220006, Минск, ул. Свердлова, 13А

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版权所有 © А.И. Клындюк, Я.Ю. Журавлева, Н.Н. Гундилович, Е.А. Чижова, 2023