Cargando…

Copper-doped lanthanum manganite La(0.65)Ce(0.05)Sr(0.3)Mn(1−x)Cu(x)O(3) influence on structural, magnetic and magnetocaloric effects

Bulk nanocrystalline samples of La(0.65)Ce(0.05)Sr(0.3)Mn(1−x)Cu(x)O(3) (0 ≤ x ≤ 0.15) manganites are prepared by the sol–gel based Pechini method. The effect of the substitution for Mn with Cu upon the structural and magnetic properties has been investigated by means of X-ray diffraction (XRD), Ram...

Descripción completa

Detalles Bibliográficos
Autores principales: Chebaane, M., Bellouz, R., Oumezzine, Ma., Hlil, E. K., Fouzri, A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9078421/
https://www.ncbi.nlm.nih.gov/pubmed/35540360
http://dx.doi.org/10.1039/c7ra13244a
_version_ 1784702327731519488
author Chebaane, M.
Bellouz, R.
Oumezzine, Ma.
Hlil, E. K.
Fouzri, A.
author_facet Chebaane, M.
Bellouz, R.
Oumezzine, Ma.
Hlil, E. K.
Fouzri, A.
author_sort Chebaane, M.
collection PubMed
description Bulk nanocrystalline samples of La(0.65)Ce(0.05)Sr(0.3)Mn(1−x)Cu(x)O(3) (0 ≤ x ≤ 0.15) manganites are prepared by the sol–gel based Pechini method. The effect of the substitution for Mn with Cu upon the structural and magnetic properties has been investigated by means of X-ray diffraction (XRD), Raman spectroscopy and dc magnetization measurements. The structural parameters obtained using Rietveld refinement of XRD data showed perovskite structures with rhombohedral (R3̄c) symmetry without any detectable impurity phase. Raman spectra at room temperature reveal a gradual change in phonon modes with increasing copper concentration. The analysis of the crystallographic data suggested a strong correlation between structure and magnetism, for instance a relationship between a distortion of the MnO(6) octahedron and the reduction in the Curie temperature, T(c). A paramagnetic to ferromagnetic phase transition at T(C) is observed. The experimental results confirm that Mn-site substitution with Cu destroys the Mn(3+)–O(2−)–Mn(4+) bridges and weakens the double exchange (DE) interaction between Mn(3+) and Mn(4+) ions, which shows an obvious suppression of the FM interaction in the La(0.65)Ce(0.05)Sr(0.3)Mn(1−x)Cu(x)O(3) matrix. The maximum magnetic entropy change −ΔS(max)(M) is found to decrease with increasing Cu content from 4.43 J kg(−1) K(−1) for x = 0 to 3.03 J kg(−1) K(−1) for x = 0.15 upon a 5 T applied field change.
format Online
Article
Text
id pubmed-9078421
institution National Center for Biotechnology Information
language English
publishDate 2018
publisher The Royal Society of Chemistry
record_format MEDLINE/PubMed
spelling pubmed-90784212022-05-09 Copper-doped lanthanum manganite La(0.65)Ce(0.05)Sr(0.3)Mn(1−x)Cu(x)O(3) influence on structural, magnetic and magnetocaloric effects Chebaane, M. Bellouz, R. Oumezzine, Ma. Hlil, E. K. Fouzri, A. RSC Adv Chemistry Bulk nanocrystalline samples of La(0.65)Ce(0.05)Sr(0.3)Mn(1−x)Cu(x)O(3) (0 ≤ x ≤ 0.15) manganites are prepared by the sol–gel based Pechini method. The effect of the substitution for Mn with Cu upon the structural and magnetic properties has been investigated by means of X-ray diffraction (XRD), Raman spectroscopy and dc magnetization measurements. The structural parameters obtained using Rietveld refinement of XRD data showed perovskite structures with rhombohedral (R3̄c) symmetry without any detectable impurity phase. Raman spectra at room temperature reveal a gradual change in phonon modes with increasing copper concentration. The analysis of the crystallographic data suggested a strong correlation between structure and magnetism, for instance a relationship between a distortion of the MnO(6) octahedron and the reduction in the Curie temperature, T(c). A paramagnetic to ferromagnetic phase transition at T(C) is observed. The experimental results confirm that Mn-site substitution with Cu destroys the Mn(3+)–O(2−)–Mn(4+) bridges and weakens the double exchange (DE) interaction between Mn(3+) and Mn(4+) ions, which shows an obvious suppression of the FM interaction in the La(0.65)Ce(0.05)Sr(0.3)Mn(1−x)Cu(x)O(3) matrix. The maximum magnetic entropy change −ΔS(max)(M) is found to decrease with increasing Cu content from 4.43 J kg(−1) K(−1) for x = 0 to 3.03 J kg(−1) K(−1) for x = 0.15 upon a 5 T applied field change. The Royal Society of Chemistry 2018-02-13 /pmc/articles/PMC9078421/ /pubmed/35540360 http://dx.doi.org/10.1039/c7ra13244a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Chebaane, M.
Bellouz, R.
Oumezzine, Ma.
Hlil, E. K.
Fouzri, A.
Copper-doped lanthanum manganite La(0.65)Ce(0.05)Sr(0.3)Mn(1−x)Cu(x)O(3) influence on structural, magnetic and magnetocaloric effects
title Copper-doped lanthanum manganite La(0.65)Ce(0.05)Sr(0.3)Mn(1−x)Cu(x)O(3) influence on structural, magnetic and magnetocaloric effects
title_full Copper-doped lanthanum manganite La(0.65)Ce(0.05)Sr(0.3)Mn(1−x)Cu(x)O(3) influence on structural, magnetic and magnetocaloric effects
title_fullStr Copper-doped lanthanum manganite La(0.65)Ce(0.05)Sr(0.3)Mn(1−x)Cu(x)O(3) influence on structural, magnetic and magnetocaloric effects
title_full_unstemmed Copper-doped lanthanum manganite La(0.65)Ce(0.05)Sr(0.3)Mn(1−x)Cu(x)O(3) influence on structural, magnetic and magnetocaloric effects
title_short Copper-doped lanthanum manganite La(0.65)Ce(0.05)Sr(0.3)Mn(1−x)Cu(x)O(3) influence on structural, magnetic and magnetocaloric effects
title_sort copper-doped lanthanum manganite la(0.65)ce(0.05)sr(0.3)mn(1−x)cu(x)o(3) influence on structural, magnetic and magnetocaloric effects
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9078421/
https://www.ncbi.nlm.nih.gov/pubmed/35540360
http://dx.doi.org/10.1039/c7ra13244a
work_keys_str_mv AT chebaanem copperdopedlanthanummanganitela065ce005sr03mn1xcuxo3influenceonstructuralmagneticandmagnetocaloriceffects
AT bellouzr copperdopedlanthanummanganitela065ce005sr03mn1xcuxo3influenceonstructuralmagneticandmagnetocaloriceffects
AT oumezzinema copperdopedlanthanummanganitela065ce005sr03mn1xcuxo3influenceonstructuralmagneticandmagnetocaloriceffects
AT hlilek copperdopedlanthanummanganitela065ce005sr03mn1xcuxo3influenceonstructuralmagneticandmagnetocaloriceffects
AT fouzria copperdopedlanthanummanganitela065ce005sr03mn1xcuxo3influenceonstructuralmagneticandmagnetocaloriceffects