Open AccessCrystal structure, thermal and electrotransport properties of NdBa1–xSrxFeCo0.5Cu0.5O5+δ (0.02 ≤ x ≤ 0.20) solid solutions
Author(s) -
A. I. Klyndyuk,
Ya. Yu. Zhuravleva,
Н. Н. Гундилович
Publication year - 2021
Publication title -
chimica techno acta
Language(s) - English
Resource type - Journals
eISSN - 2411-1414
pISSN - 2409-5613
DOI - 10.15826/chimtech.2021.8.3.01
Subject(s) - seebeck coefficient , electrical resistivity and conductivity , tetragonal crystal system , materials science , thermal expansion , barium , solid solution , strontium , thermal conductivity , thermal stability , crystal structure , strontium barium niobate , crystal (programming language) , analytical chemistry (journal) , condensed matter physics , mineralogy , crystallography , chemistry , metallurgy , dielectric , composite material , physics , electrical engineering , organic chemistry , chromatography , engineering , programming language , optoelectronics , computer science , ferroelectricity
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.