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Physics of Metals and Metallography

Erschienen in:

01.12.2019

Effects of Nonstoichiometry and Plastic Deformation on Charge and Spin States of Cobalt Ions in LnBaCo₂BaO_{5.5 – δ} (Ln = Tb, Eu): Soft X-ray Absorption Spectroscopy Studies

verfasst von: V. R. Galakhov, B. A. Gizhevskii, S. V. Naumov, M. S. Udintseva, V. V. Mesilov

Erschienen in: Physics of Metals and Metallography | Ausgabe 13/2019

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Abstract

We present results of soft X-ray absorption spectroscopy studies of nonstoichiometric Tb_1 ‒ _yBa_{1 +}_yCo_{2 –}_xO_{5.5 – δ} cobaltites and EuBaCo₂O_5.5 cobaltite powders subjected to mechanical impact (milling in a ball mill). It was established that in octahedra of Tb_1 – yBa_1 + _yCo_2 – _xO_5.5 – δ cobaltates Co³⁺ ions are in the high spin state. In EuBaCo₂O_5.5 powder after milling in a ball mill, a surface area (5–10 nm) of particles was found to be decomposed into Co₃O₄, BaCO₃, and EuCoO₃ phase components. A knowledge of the low-spin state of Co³⁺ ions in EuCoO₃ and Co₃O₄ and possibilities of surface-sensitive soft X-ray absorption spectroscopy have allowed to determine the composition of the EuBaCo₂O_5.5 sample (subjected to ball milling) near its surface, which is inaccessible to standard X-ray phase analysis.

Vorheriger Artikel Magnetic Properties of Nonstoichiometric 4f–3d Intermetallics

Nächster Artikel Ising Model on Planar Decorated Lattices. Frustrations and Their Influence on Phase Transitions

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Titel: Effects of Nonstoichiometry and Plastic Deformation on Charge and Spin States of Cobalt Ions in LnBaCo2BaO5.5 – δ (Ln = Tb, Eu): Soft X-ray Absorption Spectroscopy Studies
verfasst von: V. R. Galakhov
B. A. Gizhevskii
S. V. Naumov
M. S. Udintseva
V. V. Mesilov
Publikationsdatum: 01.12.2019
Verlag: Pleiades Publishing
Erschienen in: Physics of Metals and Metallography / Ausgabe 13/2019
Print ISSN: 0031-918X
Elektronische ISSN: 1555-6190
DOI: https://doi.org/10.1134/S0031918X19130064

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