简介:ThecompoundSm0.98Fe9.02–xGaxNδ(x=0,0.25,0.5,0.75,1)werepreparedbymelt-spunmethodandsubsequentannealingandnitriding.TheRietveldanalysisshowedthatthelatticeexpansionplayedanimportantroleinimprovingtheCurietemperature.AnobviousdevelopmentoftheCurietemperaturewasobtainedwiththeincreasedGacontentfromx=0–1(ΔTc=90oC).Theoptimumcoercivityofnitrideswasobtainedatx=0.25withthevalueHcj=652kA/m(8.15kOe)afterannealing,whichcorrespondedtoareasonabledistributionofgrainsizesofbothTbCu7-typeSmFe9Nδandα-Fe.However,anexcessofGadopingmightleadtoanabnormalgrowthofα-Fe,whichinturndeterioratedthemagneticproperties.ItwasconcludedthatamoderateGacontentwasveryeffectiveinraisingthecoercivityandCurietemperamentintheTbCu7-typeSm-Fe-N.