The height of total entropy(ST)for a magnetic refrigerant material is essentially concerned with the mag-netic and structural transitions.However,the participation of such transitions in layered materials is not well understood.Therefore,the purpose of this work is to investigate the interplay between double layer lattice with their single perovskite counterpart,to achieve optimal magnetocaloric performance.A series of self-doped Pr1.4+xSr1.6-xMn2O7(0.0≤x≤0.5)Ruddlesden-Popper(R-P)perovskite have been prepared through the solid-state sintering method.With increasing the Pr-stoichiometry,the lattice faults have in-creased and the double layer lattice dramatically disintegrates into single perovskite structure.Due to the reduction of bilayer R-P phase into single perovskite the spin crossover occurs from weak bilayer(Tc=304 K)interactions towards the strong three-dimensional(Tc=308 K)interactions respectively.This series consistently develops thermomagnetic irreversibility in zero-field cooled(ZFC)-field cooled(FC)magnetization,which is indicative of a spin-glass state.The glassy nature has been ascribed collec-tively to the lattice strain produced because of dislocations and to an antiferromagnetic phase segregated at the surface.The maximum value of temperature average entropy change(TEC)and adiabatic temper-ature(ΔTad)has enhanced nearly by 4 folds from 0.53 J kg-1 K-1,0.59 K(for x=0.0)up to 1.85 J kg-1 K-1,10 K(for x=0.5)at 2.5 T,respectively.Additionally,the room temperature relative cooling power has improved from 26.94 J/kg up to 77.84 J/kg with an applied field of 2.5 T.Our findings in this work suggest that the controlled reduction of double layer lattice into single perovskite and/or existence of both phases simultaneously in bilayer R-P manganites may be very effective in obtaining the desirable characteristics of magnetocaloric effects.

Akshay Kumar;Kavita Kumari;Mohit K.Sharma;Ankush Vij;Shalendra Kumar;Seok-Hwan Huh;Bon Heun Koo

Department of Materials Convergence and System Engineering,Changwon National University,Changwon,Gyeongnam,51140,South Korea;School of Material Science and Engineering,Changwon National University,Changwon,Gyeongnam,51140,South Korea;Department of Physics,University of Petroleum&Energy Studies,Dehradun,248 007,India;Department of Physics,College of Science,King Faisal University,Hofuf,Al-Ahsa,31982,Saudi Arabia

材料科学技术（英文版）

[1]Akshay Kumar;Kavita Kumari;Mohit K.Sharma;Ankush Vij;Shalendra Kumar;Seok-Hwan Huh;Bon Heun Koo-.Chemically inducing room temperature spin-crossover in double layered magnetic refrigerants Pr1.4+xSr1.6-xMn2O7(0.0≤x≤0.5))[J].材料科学技术（英文版）,2022(29):232-242

refrigerants,4+xSr1,xMn2O7,disintegrates,thermomagnetic,Tad,manganites

Chemically,inducing,room,temperature,spin,crossover,double,layered,Pr1,height,total,entropy,ST,essentially,concerned,structural,transitions,However,participation,such,materials,not,well,understood,Therefore,purpose,this,work,investigate,interplay,between,lattice,their,single,perovskite,counterpart,achieve,optimal,magnetocaloric,performance,series,self,doped,Ruddlesden,Popper,have,been,prepared,through,solid,state,sintering,method,With,increasing,stoichiometry,faults,creased,dramatically,into,structure,Due,reduction,bilayer,occurs,from,weak,Tc,interactions,towards,strong,three,dimensional,respectively,This,consistently,develops,irreversibility,zero,field,cooled,ZFC,magnetization,which,indicative,glassy,nature,ascribed,collec,strain,produced,because,dislocations,antiferromagnetic,segregated,surface,maximum,value,average,change,TEC,adiabatic,enhanced,nearly,by,folds,up,Additionally,relative,cooling,power,improved,applied,Our,findings,suggest,that,controlled,existence,both,phases,simultaneously,may,very,effective,obtaining,desirable,characteristics,effects

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