Crystal Structure and Properties of Complex Oxides (Nd,Ba)(Co,Fe)O3–δ

T. V. Aksenova; Аксенова Т. В.; N. E. Volkova; Волкова Н. Е.; V. S. Legonkova; Легонькова В. С.; V. A. Cherepanov; Черепанов В. А.

doi:10.31857/S0044453722120020

Crystal Structure and Properties of Complex Oxides (Nd,Ba)(Co,Fe)O3–δ

Authors: Aksenova T.V.¹, Volkova N.E.¹, Legonkova V.S.¹, Cherepanov V.A.²
Affiliations:
1. Ural Federal University named after the first President of Russia B.N. Yeltsin
2. Уральский федеральный университет им. первого Президента России Б.Н. Ельцина
Issue: Vol 97, No 1 (2023)
Pages: 101-111
Section: СТРОЕНИЕ ВЕЩЕСТВА И КВАНТОВАЯ ХИМИЯ
Submitted: 27.02.2025
Published: 01.01.2023
URL: https://permmedjournal.ru/0044-4537/article/view/668891
DOI: https://doi.org/10.31857/S0044453722120020
EDN: https://elibrary.ru/BAJSQT
ID: 668891

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Abstract
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Abstract

The homogeneity ranges and crystal structure of solid solutions of Nd1−x1BaxCo1−y1FeyO3−δ3 composition were detected. Depending on introduced barium concentration Nd1−x1BaxCo1−y1FeyO3−δ3 oxides have been crystallized in the orthorhombically distorted (x = 0.05, sp. gr. Pbnm), cubic (0.6 ≤ x ≤ 0.9, sp. gr. Pm-3m) perovskite structure or double perovskite structure NdBaCo2−x2FexO5+δ5 (0.0 ≤ x ≤ 1.4, sp. gr. P4/mmm). The dependencies of unit cell parameters versus composition of the Nd1−x1BaxCo1−y1FeyO3−δ3 solid solutions were obtained. It is shown that the values of oxygen nonstoichiometry in Nd1−x1BaxCo1−y1FeyO3−δ3, determined by a thermogravimetric method within the temperature range 298–1373 K in air, increased with the raise of barium and cobalt content. Average values of thermal expansion coefficients for the Nd1−x1BaxCo1−y1FeyO3−δ3 oxides (0.8 ≤ x ≤ 0.9 and 0.7 ≤ y ≤ 0.9) visibly increased with temperature from (13.5–14.5) × 10–6 K–1 at 300–700 K up to (23.2–26.2) × 10–6 K–1 at 700–1373 K.

Keywords

complex oxides, X-ray diffraction analysis, crystal structure, thermogravimetry, oxygen nonstoichiometry, thermal expansion

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