简介：Adistinctred-shiftto660nm-featuredlongerwavelengthofeuropiumdopedcalciumsulphidenanocrystalswasobservedinamicrowave(MW)-assistedsolvothermalsynthesisprocedure.Thisred-shiftwasprobablyduetoacombinedeffectfromMg2+codopingandstrainaccumulationatgrainboundaries.Thelatteroriginatedfromtheformationofsmallgrainswithanaveragesizeofaround200nminmicrometersizedcrystalsuponMg2+codoping.Inparticular,MWelectromagneticfieldsuppressedgraingrowthandenabledareconstructionofatomsattheinnergrainboundaryatwhichthefieldstrengthwasintensifiedaroundrareearthionsinhostlattices.ThisMWsynthesisrouteprovidedanoptiontoprepareluminescentcrystalswiththedesiredblue-excitablelongerwavelengthemission.

简介：EnvironmentalfriendlyrecyclingprocessforNd-Fe-Bsinteredmagnetsludgesgeneratedinthemanufacturingprocess,whichcontainlargeamountofrareearth,includingNd,PrandDy,isbadlyneededsofar.Inpresentstudy,wehavedevelopedaneffectiveroutetoobtainrecycledsinteredmagnetsfromNd-Fe-Bsinteredmagnetsludgesbycalciumreduction-diffusion（RD）process.Comparedtoconventionalrecyclingprocess,ourresearchisfocusedonrecoveringmostoftheusefulelements,includingNd,Pr,Dy,Co,andFetogetherinsteadofjustrareearthelements.Toimprovetherecyclingefficiencyandreducepollution,theco-precipitatingparametersweresimulatedandcalculatedusingMATLABsoftware.Mostofusefulelementswererecoveredbyaco-precipitationmethod,andtheobtainedcompositepowderswerethendirectlyfabricatedasrecycledNd-Fe-Bpowdersbyacalciumreduction-diffusion（RD）method.Therecoveryratesare98%,99%,99%,93%,and99%,forNd,Pr,Dy,Co,andFe,respectively.Theamountofusefulelementscontainedintherecoveredcompositepowdersisgreaterthan99.71wt%.TheprocessofRDforsynthesizingNd2Fe14BandsubsequentlyremovingCaOwasthoroughlyinvestigated.Furthermore,therecycledNd-Fe-Bmagnetexhibitsaremanenceof1.1T,acoercivityof1053kA/m,andanenergyproductof235.6kJ/m3,respectively,indicatingthatrecycledNd-Fe-Bsinteredmagnetwassuccessfullyrecoveredfromtheseverelycontaminatedsludgesviaaneffectiverecyclingroute.