利用电弧熔炼制备了NdxEr5-xSi3(x =0～5)系列化合物样品.通过X射线粉末衍射分析和磁性测量研究了Nd替代Er对Er5 Si3化合物结构和磁性的影响.研究结果表明:随着Nd替代量的增加,其晶体结构、相组成及磁性能发生了明显变化.低Nd含量时(x≤3),样品具有Mn5 Si3型六角结构,空间群为P63/mcm,样品具有反铁磁性.虽然奈尔温度不遵循De Gennes定律,但能被RKKY理论完美解释.高Nd含量时(x=5),样品具有Cr5B3型四方结构,空间群为I4/mcm,对外显示铁磁性.Nd含量为x=4时,两种结构共存,Rietveld精修表明Mn5 Si3型结构占58(1)％,Cr5B3型结构占42(1)％.其磁化率温度曲线在50～100 K具有铁磁性特征,但随着温度的进一步下降,又显示出反铁磁性的特征,暗示其内部存在着铁磁相和反铁磁相的耦合.
参考文献
| [1] | 黄军平,罗广圣,唐少龙,吴小山.稀土Gd5Ge2（Si2-xAlx）合金系的晶体结构和磁卡效应研究[J].中国稀土学报,2003(z1):114-116. |
| [2] | 高萍,王进贤,董相廷,刘桂霞.稀土硫化物的合成及应用研究进展[J].中国稀土学报,2012(02):146-156. |
| [3] | E.Yüzüak,I.Dincer,Y.Elerman.Effects of manganese doping on magnetocaloric effect in Ge-rich Gd5Ge2.05Si1.95 alloy[J].稀土学报（英文版）,2012(03):217-221. |
| [4] | Holtzberg F;Gambino R J;Mcguire T R .New ferromagnetic 5:4 compounds in the rare earth silicon and germanium systems[J].Journal of Physics and Chemistry of Solids,1967,28(11):2283. |
| [5] | Yu. Verbovytskyy,L.C.J. Pereira,A.P. Gonfalves.Crystal structure and magnetic properties of YbZn0.7In1.3[J].稀土学报（英文版）,2011(10):943-945. |
| [6] | Selcuk Kervan,Nazmiye Kervan,Ayse (O)zdemir,Hüseyin S(o)zeri.Investigation of the crystal structure and magnetic properties of Nd3-xGdxCO11B4 borides[J].稀土学报（英文版）,2011(05):466-470. |
| [7] | Meschel S V;Kleppa O J .Standard enthalpies of formarion of some neodymium and gadolinium carbides,silicides and germanides by high temperature direct-synthesis calorimetry[J].Journal of Alloys and Compounds,1995,217:235. |
| [8] | J. P. Semitelou;J. K. Yakinthos .The conical magnetic structure of Dy_5Si_3[J].Journal of Magnetism and Magnetic Materials,2003(2):152-155. |
| [9] | Semitelou I P;Konguetsof H;Yakinthos J K .The incommensurate magnetic structure of Tb5Si3[J].Journal of Magnetism and Magnetic Materials,1989,79(01):131. |
| [10] | Papamantellos P S .The magnetic ordering and incommensurate phase transition of Tb5Ge3-A neutron diffraction study[J].Journal of Magnetism and Magnetic Materials,1982,28(1-2):97. |
| [11] | Morozkin AV;Isnard O;Henry P;Manfrinetti P .Magnetic structure of the Mn5Si3-type Er5Ge3 compound[J].Journal of Magnetism and Magnetic Materials,2006(1):124-127. |
| [12] | Hill P.;Miller LL. .Magnetic properties of the rare-earth silicide Ho5Si3[J].Journal of Applied Physics,2000(9 Pt.3):6034-6036. |
| [13] | Semitelou IP.;Roudaut E.;Yakinthos JK. .THE MAGNETIC STRUCTURE OF ER5SI3[J].The journal of physics and chemistry of solids,1995(7):891-894. |
| [14] | Papamontellos P S;Buschow K H J .Magnetic properties of Nd5 Ge3 studied by neutron diffraction and magnetic measurements[J].Journal of Magnetism and Magnetic Materials,1985,49(03):349. |
| [15] | Vokhmyanin A P;Dorofeev Y A;Kurbakov A;Skryabin Y .Magnetic structure of Er5 Si3 at T≥20 K[J].CRYSTALLOGRAPHY REPORTS,2007,52(03):420. |
| [16] | Boulet P;Weitzer F;Hiebl K;No(e)l H .Structural chemistry,magnetism and electrical properties of binary Nd silicides[J].Journal of Alloys and Compounds,2001,315:75. |
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