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 T-N = 42 K and the coexistence of CO- AFM and FM domains in LCMNO. Despite the observed significant (delta T-FWHM) value due to relatively low magnetic entropy change (Delta S-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 |
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Article number | 025907 |
Number of pages | 11 |
Journal | Physica Scripta |
Volume | 99 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Feb 2024 |
Keywords
- Charge ordering
- Electrical resistivity
- Magnetocaloric effect
- Manganite
- Semi-conductor behavior