Large magnetocaloric effect and magnetic properties of EuRhO_(3)  

作　　者：M.Lassri M.Sajieddine A.Elouafi A.El Hachmi S.El Ouahbi R.Moubah 

机构地区：[1]Laboratory of Energy and Materials Engineering(LGEM),University of Sultan Moulay Slimane,Faculty of Science and Technology(FST),BP 523,23000,Béni-Mellal,Morocco [2]Institute of Applied Physics(IAP)-School of Industrial Management(EMINES),Mohammed Ⅵ Polytechnic University,Hay Moulay Rachid,Lot 660,3150,Ben Guerir,Morocco [3]National School of Applied Sciences(ENSA),University of Sultan Moulay Slimane,BP 77,25000,Khouribga,Morocco [4]Laboratory of Mechanics,Production and Industrial Engineering(LMPGI),Higher School of Technology of Casablanca(ESTC),University of Hassan Ⅱ Casablanca,Casablanca,Morocco [5]Laboratory of Radiation on Matter and Instrumentation(LRMI),Faculty of Science and Technology(FST)Settat,Hassan Ⅰ University,Settat,Morocco [6]Laboatory of Physics of Advanced Materials and Thermic(LPMAT),Faculty of Science Ain Chock(FSAC),University of Hassan Ⅱ Casablanca,Casablanca,Morocco

出　　处：《Journal of Rare Earths》2024年第9期1724-1729,I0004,共7页稀土学报（英文版）

摘　　要：We report on the structural,magnetic,and magnetocaloric properties of EuRhO_(3) powders.The oxidation states of Eu and Rh ions were studied using X-ray photoelectron spectroscopy(XPS).It is found that the Eu ions are mainly in the divalent oxidation state while the Rh ions have+4 state.EuRhO_(3) powders are found to be antiferromagnetic with a second order magnetic transition at Neel temperature(T_(N)=2.9 K).Analysis of the magnetic susceptibility versus temperature data in terms of the Curie=Weiss law:(χ=C/(T-θ_(W))) for T>T_(N),yields θ_(W)=-3.1 K and effective magne tic moment μ_(ff)^(exp),which is close to the theoretical value μ_(eff)^(theo).The magnetic entropy change(-Δ_(SM)),was determined by em ploying the thermodynam ic Maxwell's relation.At μ_0H=5 T and near T_(N),ΔS_(M)^(Max) and relative cooling power(RCP) exhibit large values of 33.7 J/(kg·K) and 238 J/kg,respectively.The large magnitude of-Δ_(SM) and RCP show that the EuRhO_(3) compound could be a potential candidate to be used in cryogenic magnetic refrigeration.

关 键 词：X-ray photoelectron spectroscopy Cryogenic magnetic refrigeration Magnetic properties Magnetocaloric effect Rare earths 

分 类 号：TB64[一般工业技术—制冷工程]