Effect of Ag substitution on structural,magnetic and magnetocaloric properties of Pr_(0.6)Sr_(0.4–x)Ag_xMnO_3 manganites

作     者：R.Thaljaoui M.Pekala J.-F.Fagnard Ph.Vanderbemden 

作者机构：SUPRATECSDepartment of Electrical Engineering and Computer Science(B28)University of LiegeBelgium Department of ChemistryUniversity of WarsawAl.Zwirki i Wigury 10102-089Poland Faculty of PhysicsWarsaw University of TechnologyKoszykowa 7500-662 WarsawPoland 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2017年第35卷第9期

页      面：875-882页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 081902[工学-矿物加工工程] 08[工学] 0708[理学-地球物理学] 0703[理学-化学] 

基　　金：supported by the Polish Government and WBI(Belgium)in a Frame of Mutual Scientific Exchange Visits between WBI and Polish Ministry under project with reference numbers 14794/PVB/BE.POL/AN/an/2016/28611 and Rhea 2015/245812 

主　　题：monovalent doped manganite XRD SEM ZFC and FC curves mgnetocaloric effect universal curves relative cooling power critical exponents 

摘      要：A systematic investigation on the structural, magnetic and magnetocaloric properties of Pr_（0.6）Sr_（0.4-x）Ag_xMnO_3（x=0.05 and 0.1） manganites was reported. Rietveld refinements of the X-ray diffraction patterns confirmed that all samples were single phase and crystallized in the orthorhombic structure with Pnma space group. Magnetic measurements in a magnetic applied field of 0.01T revealed that the ferromagnetic-paramagnetic transition temperature T_C decreased from about 293 to 290 K with increasing silver content from x=0.05 to 0.1. The reported magnetocaloric entropy change and relative cooling power for both samples were considerably remarkable with a △S_（max） value of 1.9 J/（kg·K）and maximum RCP values of 100 J/kg, under a magnetic field change（？μ0H） equal to 1.8T. The analysis of the universal curves gave an evidence of a second order magnetic transition for the studied samples. The magnetic field influence on both the magnetic entropy change and the relative cooling power was also studied and discussed.