The phases and the magnetocaloric effect in the alloys R(Co1-xSnx)2 with x = 0, 0.025, 0.050, 0.075, and 0.100 were investigated by X-ray diffraction analysis and magnetization measurement. The substitution of Sn in RCo2 is limited.The cubic MgCu2-type structure for the alloys of RCo2 was confirmed by X-ray powder diffraction and the remaining alloys mainly consisted of the RCo2 phase, along with some RCo3 and R5Sn3 impurity phases. The impurity phases increase with the increase of Sn content. The Tc of the alloys is not very sensitive to the Sn substitution for Dy(Co1-xSnx)2 and Th(Co1-xSnx)2, whereas in Gd(Co1-xSnx)2, the Curie temperatures significantly increase. The maximum magnetic entropy changes in the alloys Dy(Co1-xSnx)2 (x = 0, 0.025, 0.050, 0.075) are 5.78, 5.43, 3.88, and 2.98 J·kg-1·K-1, respectively, and those in the Tb(Co1-xSnx)2 (x = 0, 0.025) are 3.44, and 2.29 J·kg-1·K-1 respectively in the applied field change of 0-2.0 T.
参考文献
| [1] | Duc NH.;Anh DTK. .Magnetocaloric effects in RCo2 compounds[J].Journal of Magnetism and Magnetic Materials,2002(2):873-875. |
| [2] | Wang D H;Tang S L;Liu H D;Gao W L and Du Y W .Large low-field magnetic entropy change in DyCo2[J].Intermetallics,2002,10:819. |
| [3] | Nguyen H D .Magnetic and electrical properties of the R(Co,Si)2 compounds (R = Gd,Tb,Dy) with invariable crystal unit cell parameters[J].Journal of Magnetism and Magnetic Materials,1996,152:219. |
| [4] | Szajek A;Kowalczyk A;Basy(n)ski J;Jezierski A and Mydlarz T .The Magnetic properties of the Laves-phase system Dy(Co1-xAlx)2[J].Journal of Magnetism and Magnetic Materials,1996,157-158:723. |
| [5] | Kowalczyk A.;Baszynski J.;Kovac J.;Chelkowska G.;Szajek A. .THE INFLUENCE OF PARTIAL SUBSTITUTION OF CO BY AL ATOMS ON THE MAGNETIC PROPERTIES OF DYCO2 COMPOUND[J].Journal of Magnetism and Magnetic Materials,1997(1/2):237-242. |
| [6] | Liu H D;Wang D H;Tang S L;Cao Q Q Tang T Gu B X and Du Y W .The magnetocaloric effect and magnetic phase transitions in Dy(Co1-xAlx)2compounds[J].Journal of Alloys and Compounds,2002,346:314. |
| [7] | Kowalczyk A.;Kovac J.;Szlaferek A.;Baszynski J. .MAGNETIC AND RESISTIVITY INVESTIGATION OF DY(CO1-XSIX)(2) (0-LESS-THAN-X-LESS-THAN-OR-EQUAL-TO-0.2) COMPOUNDS[J].Journal of Magnetism and Magnetic Materials,1997(2/3):241-247. |
| [8] | Wang Yu;Yang Sen;Song Xiaoping .Low-field magnetic properties and magnetocaloric effect in annealed and as-cast Dy(Co_(1-x)Si_x)_2 compounds[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2003(1/2):81-84. |
| [9] | Chelkowska G;Debiec I .Electronic structure and magnetic properties of Gd(Co1-xMx)2 compounds,M = Ga,Si,Ge[J].Journal of Alloys and Compounds,2002,337:39. |
| [10] | Debiec I;Chelkowska G .Magnetic,electric and XPS study of Tb(Co1-xGax)2 compounds[J].Journal of Magnetism and Magnetic Materials,2003,261:73. |
| [11] | Villars P.Pearson's Handbook,Desk Edition[A].ASM,Materials Park,Ohio,1977 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%