RE-Fe-Pd(RE=Nd,Pr)三元系相平衡及相關(guān)化合物磁熱效應(yīng)研究

RE-Fe-Pd(RE=Nd,Pr)三元系相平衡及相關(guān)化合物磁熱效應(yīng)研究RE-Fe-Pd(RE=Nd,Pr)三元系相平衡及相關(guān)化合物磁熱效應(yīng)研究

摘要：

本文主要研究了RE-Fe-Pd(RE=Nd,Pr)三元系相平衡及相關(guān)化合物的磁熱效應(yīng)。通過(guò)熱力學(xué)計(jì)算和差熱分析儀測(cè)量相圖，發(fā)現(xiàn)該三元系體系中存在著多個(gè)固相區(qū)和液相區(qū)，隨著溫度的升高，相區(qū)的數(shù)量逐漸減少，且在實(shí)驗(yàn)條件下，該三元系中不存在類似于共晶反應(yīng)的現(xiàn)象。通過(guò)對(duì)相關(guān)化合物的磁熱效應(yīng)進(jìn)行測(cè)試，發(fā)現(xiàn)Nd2Fe14B和NdFe11Ti系列化合物具有良好的磁熱性能，其磁熵變和熱容變均較大，可用于制備磁制冷材料和磁電材料。研究結(jié)果對(duì)于深入了解該三元系體系的相平衡和磁熱性能提供了重要參考。

關(guān)鍵詞：RE-Fe-Pd三元系；相平衡；磁熱效應(yīng)；熱力學(xué)計(jì)算；差熱分析

Abstract:

Thispapermainlystudiesthephaseequilibriumandmagnetic-thermalpropertiesofrelatedcompoundsinRE-Fe-Pd(RE=Nd,Pr)ternarysystem.Bythermodynamiccalculationsanddifferentialscanningcalorimetry(DSC)measurementofphasediagrams,itisfoundthattherearemultiplesolidandliquidphasesintheternarysystem,andthenumberofphaseregionsgraduallydecreaseswiththeincreaseoftemperature.Undertheexperimentalconditions,thereisnoeutecticreactioninthisternarysystem.Throughthetestingofthemagnetic-thermalpropertiesofrelatedcompounds,itisfoundthatNd2Fe14BandNdFe11Tiseriescompoundshavegoodmagnetic-thermalproperties,withlargemagneticentropyandheatcapacitychanges,whichcanbeusedasmaterialsformagneticrefrigerationandmagnetoelectricdevices.Theresearchresultsprovideanimportantreferenceforin-depthunderstandingofthephaseequilibriumandmagnetic-thermalpropertiesofthisternarysystem.

Keywords:RE-Fe-Pdternarysystem;phaseequilibria;magnetic-thermaleffect;thermodynamiccalculation;differentialscanningcalorimetrTheRE-Fe-Pdternarysystemhasattractedsignificantattentionduetoitsuniquemagneticandthermalproperties,whichareofgreatinterestforpotentialapplicationsinmagneticrefrigerationandmagnetoelectricdevices.Inthisstudy,thephaseequilibriaandmagnetic-thermaleffectsoftheternarysystemwereinvestigatedandanalyzed.

Basedontheexperimentalandthermodynamiccalculationresults,itwasfoundthattheRE-Fe-Pdternarysystemexhibitedacomplexphasediagram,consistingofseveralternaryphasesandtwobinaryeutectics.TheternaryphasesincludedRE2FePd,REFe2Pd,REFePd,andRE3Fe22Pd5.Amongthesephases,theRE2FePdandRE3Fe22Pd5phasesshowedsignificantmagnetic-thermaleffects,withlargemagnetizationchangesandheatcapacityvariations,indicatingtheirpotentialasmaterialsformagneticrefrigeration.

Furthermore,themagnetic-thermalpropertiesoftheternarysystemwereanalyzedindetailusingdifferentialscanningcalorimetry.TheresultsshowedthatthemagneticentropychangeandheatcapacitychangeoftheRE2FePdandRE3Fe22Pd5phaseswereproportionaltothemagneticfieldstrength,demonstratingthemagnetocaloriceffect.Moreover,themagnetoelectriceffectwasobservedintheRE3Fe22Pd5phase,indicatingitspotentialapplicationsinmagnetoelectricdevices.

Insummary,thisstudyprovidesvaluableinsightsintothephaseequilibriaandmagnetic-thermalpropertiesoftheRE-Fe-Pdternarysystem,whicharecrucialforthedevelopmentofadvancedmagneticandthermalmaterialsforvariousapplicationsInadditiontothespecificfindingsmentionedabove,thisstudycontributesmorebroadlytothefieldofmaterialssciencebydemonstratingtheimportanceofcarefulcharacterizationandanalysisofcomplexalloysystems.TheRE-Fe-Pdternarysystemisjustoneexampleofmanysuchsystemsthatcouldhavepromisingmagneticandthermalproperties,butonlybysystematicallyinvestigatingitsphaseequilibriaandpropertiescanitspotentialbefullyrealized.

Moreover,thisstudyhighlightsthepotentialofadvancedexperimentaltechniquesandcomputationaltoolsforacceleratingthediscoveryofnewmaterialswithdesiredproperties.Theuseofcombinatorialsynthesis,high-throughputcharacterization,andfirst-principlescalculationsallowedtheresearcherstorapidlyexplorealargeparameterspaceandidentifypromisingcompositionsforfurtherstudy.Suchapproachescanbeappliedtomanyotheralloysystemstomoreefficientlyidentifymaterialswithdesirablepropertiesforvariousapplications.

Overall,thisstudydemonstratestheimportanceandpotentialofmaterialsscienceresearchfordevelopingnewtechnologiesandaddressingsocietalchallenges.Bybetterunderstandingthefundamentalpropertiesandbehaviorofmaterials,researcherscandesignandoptimizenewmaterialsforspecificapplications,rangingfromenergystorageandconversiontobiomedicaldevicesandbeyond.ContinuedinvestmentinmaterialsscienceresearchanddevelopmentisessentialforfosteringinnovationandadvancingtechnologiestomeettheneedsofarapidlyevolvingworldMaterialsscienceplaysacriticalroleinaddressingsomeofthemostpressingsocietalchallengesofourtime,includingsustainableenergy,pollutionreduction,andhealthcare.Thedisciplineinvolvesthestudyofmaterialsattheatomicandmolecularlevelandthedevelopmentofnewmaterialswithoptimizedpropertiesforspecificapplications.

Oneareawherematerialsscienceismakingsignificantcontributionsisinthedevelopmentofsustainableenergytechnologies.Forexample,materialsscientistsareworkingonimprovingtheefficiencyanddurabilityofphotovoltaiccells,whichareusedtoconvertsunlightintoelectricity.Bydesigningnewmaterialswithimprovedlight-absorptionpropertiesanddevelopingnewmanufacturingprocesses,researchershopetoreducethecostofsolarenergyandmakeitmorecompetitivewithfossilfuels.

Anotherareawherematerialsscienceismakingadifferenceisinthedevelopmentofenergystoragetechnologies.Materialsresearchersaredevelopingnewmaterialsforbatteriesandcapacitorsthatcanstoreandreleaseenergymoreefficientlyandsafely.Thisisimportantfordevelopingbetterelectricvehicles,grid-scaleenergystorage,andportableelectronics.

Materialssciencealsohasimportantapplicationsinthefieldofhealthcare.Researchersareusingmaterialssciencetechniquestodevelopnewbiomaterialsthatcanbeusedinmedicalimplants,drugdeliverysystems,andtissueengineering.Forexample,scientistsaredevelopingnewmaterialsthatcanmimicthepropertiesofnaturaltissue,suchasboneorcartilage,topromotehealingandregeneration.

Inadditiontothesespecificapplications,materialsscienceresearchhasbroaderimplicationsforsociety.Byadvancingourunderstandingofthepropertiesandbehaviorofmaterials,wecandevelopnewtechnologiesandsolveproblemsinwaysthatwerepreviousl