Magnetic effect and chemical distribution study of LCMNO3 perovskite by photoelectron spectroscopy

Mourad Smari; Youssef Moualhi; Yongfeng Tong; Said Mansour; Hedi Rahmouni

doi:10.1088/1402-4896/ad13e0

Magnetic effect and chemical distribution study of LCMNO₃ perovskite by photoelectron spectroscopy

Mourad Smari^*, Youssef Moualhi, Yongfeng Tong, Said Mansour, Hedi Rahmouni

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

The crystal structure, x-ray photoemission spectroscopy, magnetic characteristics, and magnetocaloric performance of perovskite La_0.55Ca_0.45Mn_0.8Nb_0.2O₃ (LCMNO) ceramic powder were analyzed. The orthorhombic structure with a Pnma space group was found as the main phase in the as-received compound after the XRD pattern refinement. The mixed-valence states of manganese were detected by x-ray photoemission spectroscopy (XPS). The analysis of the La3d line revealed the complex nature of the lanthanum states. The evaluation of Zero-Field-Cooled and Field-Cooled magnetization performance provided conclusive evidence for the existence of the antiferromagnetic Mn₃O₄ phase at a temperature of T_N = 42 K and the coexistence of CO- AFM and FM domains in LCMNO. Despite the observed significant (δT_FWHM) value due to relatively low magnetic entropy change (ΔS_M), the relative cooling power (RCP) is relatively moderate. By adding Nb⁴⁺, the changes in Mn valences and their effect on the magnetic cooling effect are lessened.

Original language	English
Article number	025907
Journal	Physica Scripta
Volume	99
Issue number	2
DOIs	https://doi.org/10.1088/1402-4896/ad13e0
Publication status	Published - 1 Feb 2024

Keywords

Charge ordering
Electrical resistivity
Magnetocaloric effect
Manganite
Semi-conductor behavior

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10.1088/1402-4896/ad13e0

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@article{ed3a48d165084d9d88fbee0968a52fca,

title = "Magnetic effect and chemical distribution study of LCMNO3 perovskite by photoelectron spectroscopy",

abstract = "The crystal structure, x-ray photoemission spectroscopy, magnetic characteristics, and magnetocaloric performance of perovskite La0.55Ca0.45Mn0.8Nb0.2O3 (LCMNO) ceramic powder were analyzed. The orthorhombic structure with a Pnma space group was found as the main phase in the as-received compound after the XRD pattern refinement. The mixed-valence states of manganese were detected by x-ray photoemission spectroscopy (XPS). The analysis of the La3d line revealed the complex nature of the lanthanum states. The evaluation of Zero-Field-Cooled and Field-Cooled magnetization performance provided conclusive evidence for the existence of the antiferromagnetic Mn3O4 phase at a temperature of TN = 42 K and the coexistence of CO- AFM and FM domains in LCMNO. Despite the observed significant (δTFWHM) value due to relatively low magnetic entropy change (ΔSM), the relative cooling power (RCP) is relatively moderate. By adding Nb4+, the changes in Mn valences and their effect on the magnetic cooling effect are lessened.",

keywords = "Charge ordering, Electrical resistivity, Magnetocaloric effect, Manganite, Semi-conductor behavior",

author = "Mourad Smari and Youssef Moualhi and Yongfeng Tong and Said Mansour and Hedi Rahmouni",

note = "Publisher Copyright: {\textcopyright} 2024 IOP Publishing Ltd.",

year = "2024",

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day = "1",

doi = "10.1088/1402-4896/ad13e0",

language = "English",

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TY - JOUR

T1 - Magnetic effect and chemical distribution study of LCMNO3 perovskite by photoelectron spectroscopy

AU - Smari, Mourad

AU - Moualhi, Youssef

AU - Tong, Yongfeng

AU - Mansour, Said

AU - Rahmouni, Hedi

PY - 2024/2/1

Y1 - 2024/2/1

N2 - The crystal structure, x-ray photoemission spectroscopy, magnetic characteristics, and magnetocaloric performance of perovskite La0.55Ca0.45Mn0.8Nb0.2O3 (LCMNO) ceramic powder were analyzed. The orthorhombic structure with a Pnma space group was found as the main phase in the as-received compound after the XRD pattern refinement. The mixed-valence states of manganese were detected by x-ray photoemission spectroscopy (XPS). The analysis of the La3d line revealed the complex nature of the lanthanum states. The evaluation of Zero-Field-Cooled and Field-Cooled magnetization performance provided conclusive evidence for the existence of the antiferromagnetic Mn3O4 phase at a temperature of TN = 42 K and the coexistence of CO- AFM and FM domains in LCMNO. Despite the observed significant (δTFWHM) value due to relatively low magnetic entropy change (ΔSM), the relative cooling power (RCP) is relatively moderate. By adding Nb4+, the changes in Mn valences and their effect on the magnetic cooling effect are lessened.

AB - The crystal structure, x-ray photoemission spectroscopy, magnetic characteristics, and magnetocaloric performance of perovskite La0.55Ca0.45Mn0.8Nb0.2O3 (LCMNO) ceramic powder were analyzed. The orthorhombic structure with a Pnma space group was found as the main phase in the as-received compound after the XRD pattern refinement. The mixed-valence states of manganese were detected by x-ray photoemission spectroscopy (XPS). The analysis of the La3d line revealed the complex nature of the lanthanum states. The evaluation of Zero-Field-Cooled and Field-Cooled magnetization performance provided conclusive evidence for the existence of the antiferromagnetic Mn3O4 phase at a temperature of TN = 42 K and the coexistence of CO- AFM and FM domains in LCMNO. Despite the observed significant (δTFWHM) value due to relatively low magnetic entropy change (ΔSM), the relative cooling power (RCP) is relatively moderate. By adding Nb4+, the changes in Mn valences and their effect on the magnetic cooling effect are lessened.

KW - Charge ordering

KW - Electrical resistivity

KW - Magnetocaloric effect

KW - Manganite

KW - Semi-conductor behavior

UR - https://www.scopus.com/pages/publications/85182264628

U2 - 10.1088/1402-4896/ad13e0

DO - 10.1088/1402-4896/ad13e0

M3 - Article

AN - SCOPUS:85182264628

SN - 0031-8949

VL - 99

JO - Physica Scripta

JF - Physica Scripta

IS - 2

M1 - 025907

ER -

Magnetic effect and chemical distribution study of LCMNO₃ perovskite by photoelectron spectroscopy

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Keywords

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