研究了LaGd_(0.1)Fe_(11.4-x)Co_xSi_(1.6)(x=0.1,0.3,0.5,0.7,0.9)系列合金的结构以及磁热效应.室温XRD分析表明该系列合金除微量的α-Fe相外,均具有立方NaZn_(13)型立方单相晶体结构,空间群为Fm-3c.晶格常数没有明显变化,分别为1.1458,1.1454,1.1458,1.1459,1.469 nm.磁性测量表明该系列合金的T_c随着Co含量的增加而增加,分别为212,231,253,281,302 K.在外磁场变化AB=1.5 T时,最大的磁熵变随着Co含量的增加而减少,由x=0.1的13.8 J降为x=0.9 J·kg~(-1)·K~(-1)的1.5 J·kg~(-1).K~(-1).并且随着Co含量的增加存在由一级相变转为二级相变的趋势.
The effect of substitution of Co for Fe on the structure,magnetic properties and magnetic entropy changes in LaGd_(0.1)Fe_(11.4-x)Co_xSi_(1.6)(x=0.1,0.3,0.5,0.7,0.9)was investigated.The X-ray diffraction showed that LaGd_(0.1) Fe_(11.4-x)Co_x Si_(1.6)(x=0.1,0.3,0.5,0.7,0.9)alloys consisted of the NaZn_(13)-type phase(Fm-3c)and minor amount of α-Fe phase.There were no obvious changes of cell constants,1.1458,1.14549,1.1458,1.1459,1.469 nm for x=0.1,0.3,0.5,0.7 and 0.9,respectively.Magnetic measurements showed that the Curie temperature of the alloys increased from 212 K to 302 K by changing the Co content from 0.1 to 0.9.the giant magnetic entropy change decreased from (13.8J·Kg_(-1)·K_(-1))to (1.5J·Kg_(-1)·K_(-1)) for x=0.1 and x=0.9under a magnetic field varying from 0 to 1.5 T.Additionally,there was a trend from first-order phase transition to second-order phase transition with increasing Co concentration.
参考文献
| [1] | Pecharsky VK;Gschneidner KA .Giant magnetocaloric effect in Gd-5(Si2Ge2)[J].Physical review letters,1997(23):4494-4497. |
| [2] | Tegus;Brock E;Buschow K H J et al.Transition-metal-based magnetic refrigerants for room-temperature applications[J].Nature,2002,415:150. |
| [3] | Wada H;Tanabe Y .Giant magnetocaloric effect of MnAs_(1-x) Sb_x[J].Applied Physics Letters,2001,79:3302. |
| [4] | Hu F X;Shen B G;Sun J R;Cheng z H,Paw G H,zhang X X .Influnence of negative lattice expansion and metamagnetic transition on magnetic entropy change in the compound LaFe_(11.4)Si_(1 6)[J].Applied Physics Letters,2001,78:3675. |
| [5] | Fujieda S;Fujita A;Fukamiehi K .Large magnetecaloric effect in La(Fe_xSi4_(1-x))_(13) itinerant-electron metamngnetic compounds[J].Applied Physics Letters,2002,81:1276. |
| [6] | Fujita A;Fujieda S;Fukammichi K .Itinerant-electron metamagnetic transition and hrge magnetovolume effects in La (Fe_xSi_(1-x[J].Physical Review B,2001,65:014410-014411. |
| [7] | 李福安,松林,包黎红,哈斯朝鲁,特古斯,黄焦宏.LaFe11.9-xCoxSi1.1B0.2（x=0.7,0.8,0.9）合金的磁热效应[J].金属学报,2008(03):371-374. |
| [8] | 李福安;松林;闫换英;哈斯朝鲁,特古斯 .LafFe_(10.1)Co_(0 9)Si_2B_x(x=0,0 1,0 2)的磁热效应[J].功能材料,2008,39:286. |
| [9] | Chen YF.;Wang F.;Shen BG.;Hu FX.;Sun JR.;Wang GJ.;Cheng ZH. .Magnetic properties and magnetic entropy change of LaFe11.5Si1.5Hy interstitial compounds[J].Journal of Physics. Condensed Matter,2003(7):L161-L167. |
| [10] | Xie SH;Li JQ;Zhuang YH .Influence of boron on the giant magnetocaloric effect of La(Fe0.9Si0.1)(13)[J].Journal of Magnetism and Magnetic Materials,2007(2):589-593. |
| [11] | Wang G F;Song L;Li F A;Ou Z Q,Tegus O,Brock E,Buschow K H J.Magnetocaloric effect in the La_(0.8) Ce_(0.2) Fe_(11.4-x)Co_xSi_(1.6) compounds[J].Journal of Magnetism and Magnetic Materials,2008 |
| [12] | 胡义嘎,松林,闫换英,李福安,特古斯.La0.6Pr0.05Fe11.5-xCoxSi1.5合金的磁性和磁热效应[J].中国稀土学报,2009(03):369-374. |
| [13] | Fujieda S;Fujita A;Fukamichi K .Enhancement of magnetocaloric effects in La_(1-x)Pr_x(Fe_(0.88)Si_(0 12_(13) and their hydtides[J].Journal of Applied Physics,2007,102:023907. |
| [14] | Kim Anh D T;Thuy N P;Duc N H;Nhien T T,Nong N V .Magnetism and magnetocoloric effect in La1-y Ndy(Fe_(0.88)Si_(0 12)_(13) compounds[J].Journal of Magnetism and Magnetic Materials,2003,262:427. |
| [15] | Balli M;Fruchart D;GignotLx D;Rosca M,Miraglia S .Magnetic and magnetocaloric properies of La_(1-x)Er_xFe_(11.44)Si_(1 56) compounds[J].Journal of Magnetism and Magnetic Materials,2007,313:43. |
| [16] | DemunerA S;Takeuchi A Y;Passamani E C;Proveti J R,Larica C.Magnetocaloric properties of the(La-Cd)Fe_(11.4)Si_(1.6) metamagnetic compound[J].Journal of Magnetism and Magnetic Materials,2009 |
| [17] | Hu F X;Shen B G;Sun J R;Wang G J,Cheng Z H .Very large magnetic entropy change near room temperature in LaFe_(11.2)Co_(0 7S)i_(1 1)[J].Applied Physics Letters,2002,80:826. |
| [18] | Hu F X;Shen B G;Sun J R;Cheng Z H,Rao G H,Zhang X X .Influence of negative lattice expansion and metamagnetic transition on magnetic entropy change in the compound LaFe_(11.4)Si_(1 6)[J].Applied Physics Letters,2001,78:3675. |
| [19] | Sinnema S;Frame J J M;Radwanski R J;Menovsky A FR de Boer .High-field magnetization studies on the Ho_2(Co,Fe)_(17) intermetallics[J].Journal of Physics F:Metal Physics,1987,17:233. |
| [20] | Fujiata A;Akamatsu Y;Fukamichi K .Itinerant electron metamagnetic transiton in La(Fe_xSi_(1-x[J].Journal of Applied Physics,1999,85:4756. |
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