Study of the doping of Sr by Ag in manganites La0.57Nd0.1Sr0.33-xAgxMnO3 (0.00-0.15) on assessment structural, magneticand Magnetocaloric at room temperature

被引:2
|
作者
Issaoui, H. [1 ]
Gharbi, S. [1 ]
Issaoui, F. [2 ]
Hcini, S. [2 ]
Alzahrani, B. [3 ]
Bouazizi, M. L. [3 ]
Al Robei, H. [3 ]
Dhahri, E. [2 ]
机构
[1] Univ Sfax, Fac Sci, Lab Phys Appl, BP 1171, Sfax 3000, Tunisia
[2] Univ Kairouan, Fac Sci & Technol Sidi Bouzid, Res Unit Valorizat & Optimizat Resource Exploitat, Sidibouzid 9100, Tunisia
[3] Prince Sattam Bin Abdulaziz Univ, Coll Engn, Al Kharj 11942, Saudi Arabia
关键词
Solid-state synthesis; Magnetic properties; X-ray diffraction; Ftir spectroscopy; Magnetic entropy; Refrigeration capacity (RCP); BI-SUBSTITUTION; ENTROPY CHANGE; TRANSPORT; DISORDER; SITE;
D O I
10.1016/j.molstruc.2021.132282
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We describe in this manuscript the effect of the substitution of a divalent element such as strontium Sr2+ by a monovalent element such as silver Ag+ on the variation of the Mn-Mn distance between two adjacent MnO6 octahedra and also on the evolution of Mn -O -Mn and also on the overlap of manganese d orbitals and oxygen 2p orbitals. then in this study, we synthesized by the solid-solid method the polycrystalline oxides La0.57Nd0.1Sr0.33-xAgxMnO3 (x = 0 and 0.15) LNSAMO.X-ray diffraction study shows that these compounds crystallize in the rhombohedral structure of space group R-3C and exhibit a second Mn3O4 phase of space group I 41 / amd. All the magnetization curves show a high temperature transition from a ferromagnetic state to a paramagnetic state near the Curie temperature (T-C) and a second transition associated with the secondary phase Mn3O4. The Curie temperature decreases from 321 K to 307 K as the disorder increases. However, we have noticed that the substitution of strontium which is a magnetic element by non-magnetic silver causes the increase of the magnetization as well as the decrease of the temperature of Curie T-C. When an external magnetic field mu 0H = 5 T, we find that the values ofmagnetic entropy (Delta S-M(max)) are equal to 2.68, 4.55 and 5.08 J Kg 1 K 1, respectively, for x = 0.0, 0.1 and 0.15 samples. The relative cooling power (RCP) is around 80.10 J/kg, 137 J/kg,146.74 J/kg of X = 0, X = 0.1 f, X = 0.15 compounds for the 5T magnetic field. By basing the results of this work, we achieve that the controlled Ag doping adapts perfectly to the magnetic and Magnetocaloric characteristic of LNSMO Which perform a significant function in the realization of much potential applying of the compound in the field of approximately-room temperature magnetic refrigeration technology. (c) 2021 Published by Elsevier B.V.
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页数:13
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