Cargando…

Antiferromagnet–Ferromagnet Transition in Fe(1−x)Cu(x)NbO(4)

Iron niobates, pure and substituted with copper (Fe(1−x)Cu(x)NbO(4) with x = 0–0.15), were prepared by the solid-state method and characterized by X-ray diffraction, Raman spectroscopy, and magnetic measurements. The results of the structural characterizations revealed the high solubility of Cu ions...

Descripción completa

Detalles Bibliográficos
Autores principales: Evaristo, Diego S., Jucá, Raí F., Soares, João M., Silva, Rodolfo B., Saraiva, Gilberto D., Matos, Robert S., Ferreira, Nilson S., Salerno, Marco, Macêdo, Marcelo A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9658787/
https://www.ncbi.nlm.nih.gov/pubmed/36363016
http://dx.doi.org/10.3390/ma15217424
_version_ 1784830039364206592
author Evaristo, Diego S.
Jucá, Raí F.
Soares, João M.
Silva, Rodolfo B.
Saraiva, Gilberto D.
Matos, Robert S.
Ferreira, Nilson S.
Salerno, Marco
Macêdo, Marcelo A.
author_facet Evaristo, Diego S.
Jucá, Raí F.
Soares, João M.
Silva, Rodolfo B.
Saraiva, Gilberto D.
Matos, Robert S.
Ferreira, Nilson S.
Salerno, Marco
Macêdo, Marcelo A.
author_sort Evaristo, Diego S.
collection PubMed
description Iron niobates, pure and substituted with copper (Fe(1−x)Cu(x)NbO(4) with x = 0–0.15), were prepared by the solid-state method and characterized by X-ray diffraction, Raman spectroscopy, and magnetic measurements. The results of the structural characterizations revealed the high solubility of Cu ions in the structure and better structural stability compared to the pure sample. The analysis of the magnetic properties showed that the antiferromagnetic–ferromagnetic transition was caused by the insertion of Cu(2+) ions into the FeNbO(4) structure. The pure FeNbO(4) structure presented an antiferromagnetic ordering state, with a Néel temperature of approximately 36.81K. The increase in substitution promoted a change in the magnetic ordering, with the state passing to a weak ferromagnetic order with a transition temperature (T(c)) higher than the ambient temperature. The origin of the ferromagnetic ordering could be attributed to the increase in super-exchange interactions between Fe/Cu ions in the Cu(2+)-O-Fe(3+) chains and the formation of bound magnetic polarons in the oxygen vacancies.
format Online
Article
Text
id pubmed-9658787
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-96587872022-11-15 Antiferromagnet–Ferromagnet Transition in Fe(1−x)Cu(x)NbO(4) Evaristo, Diego S. Jucá, Raí F. Soares, João M. Silva, Rodolfo B. Saraiva, Gilberto D. Matos, Robert S. Ferreira, Nilson S. Salerno, Marco Macêdo, Marcelo A. Materials (Basel) Article Iron niobates, pure and substituted with copper (Fe(1−x)Cu(x)NbO(4) with x = 0–0.15), were prepared by the solid-state method and characterized by X-ray diffraction, Raman spectroscopy, and magnetic measurements. The results of the structural characterizations revealed the high solubility of Cu ions in the structure and better structural stability compared to the pure sample. The analysis of the magnetic properties showed that the antiferromagnetic–ferromagnetic transition was caused by the insertion of Cu(2+) ions into the FeNbO(4) structure. The pure FeNbO(4) structure presented an antiferromagnetic ordering state, with a Néel temperature of approximately 36.81K. The increase in substitution promoted a change in the magnetic ordering, with the state passing to a weak ferromagnetic order with a transition temperature (T(c)) higher than the ambient temperature. The origin of the ferromagnetic ordering could be attributed to the increase in super-exchange interactions between Fe/Cu ions in the Cu(2+)-O-Fe(3+) chains and the formation of bound magnetic polarons in the oxygen vacancies. MDPI 2022-10-22 /pmc/articles/PMC9658787/ /pubmed/36363016 http://dx.doi.org/10.3390/ma15217424 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Evaristo, Diego S.
Jucá, Raí F.
Soares, João M.
Silva, Rodolfo B.
Saraiva, Gilberto D.
Matos, Robert S.
Ferreira, Nilson S.
Salerno, Marco
Macêdo, Marcelo A.
Antiferromagnet–Ferromagnet Transition in Fe(1−x)Cu(x)NbO(4)
title Antiferromagnet–Ferromagnet Transition in Fe(1−x)Cu(x)NbO(4)
title_full Antiferromagnet–Ferromagnet Transition in Fe(1−x)Cu(x)NbO(4)
title_fullStr Antiferromagnet–Ferromagnet Transition in Fe(1−x)Cu(x)NbO(4)
title_full_unstemmed Antiferromagnet–Ferromagnet Transition in Fe(1−x)Cu(x)NbO(4)
title_short Antiferromagnet–Ferromagnet Transition in Fe(1−x)Cu(x)NbO(4)
title_sort antiferromagnet–ferromagnet transition in fe(1−x)cu(x)nbo(4)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9658787/
https://www.ncbi.nlm.nih.gov/pubmed/36363016
http://dx.doi.org/10.3390/ma15217424
work_keys_str_mv AT evaristodiegos antiferromagnetferromagnettransitioninfe1xcuxnbo4
AT jucaraif antiferromagnetferromagnettransitioninfe1xcuxnbo4
AT soaresjoaom antiferromagnetferromagnettransitioninfe1xcuxnbo4
AT silvarodolfob antiferromagnetferromagnettransitioninfe1xcuxnbo4
AT saraivagilbertod antiferromagnetferromagnettransitioninfe1xcuxnbo4
AT matosroberts antiferromagnetferromagnettransitioninfe1xcuxnbo4
AT ferreiranilsons antiferromagnetferromagnettransitioninfe1xcuxnbo4
AT salernomarco antiferromagnetferromagnettransitioninfe1xcuxnbo4
AT macedomarceloa antiferromagnetferromagnettransitioninfe1xcuxnbo4