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- Title
Enhancement of magnetic entropy change in La<sub>0.57</sub>Nd<sub>0.1</sub>Sr<sub>0.33-x</sub>Ca<sub>x</sub>MnO<sub>3</sub> manganites.
- Authors
Akça, Gönül
- Abstract
In present work, structural, magnetic, and magnetocaloric properties of La0.57Nd0.1Sr0.33-xCaxMnO3 (0.0 ≤ x ≤ 0.3) samples have been studied. The conventional solid-state method was used to prepare the samples. The structural properties of the samples were investigated by X-ray diffractometer and scanning electron microscopy. All samples crystallized in rhombohedral structure. The samples consist of grains of different polygonal shape and size. The temperature dependence of magnetization measurements was performed to determine magnetic phase transition temperature. It is observed that the magnetic phase transition temperature decreases with increasing Ca concentration. Magnetic entropy change ( - Δ S M ) values of the samples were calculated from the magnetic field dependence of the magnetization based on Maxwell's relation. An enhancement in the - Δ S M value was observed with increasing Ca concentration. The maximum magnetic entropy change ( - Δ S M max ) value was calculated as 5.85 Jkg−1 K−1 under 2 T magnetic fields for La0.57Nd0.1Sr0.03Ca0.30MnO3 sample. The increase in Ca concentration also caused an increase in the relative cooling power value (RCP). The nature of the magnetic phase transition for the samples was determined using the Banerjee criteria and Franco's universal master curve. The magnetic phase transition type is found as second order for all samples.
- Subjects
MAGNETIC entropy; FRANCO, Francisco, 1892-1975; MAGNETIC transitions; TRANSITION temperature; MAGNETIC fields; MAGNETIZATION measurement; SCANNING electron microscopy
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 35, p26495
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-09328-w