The structure and magnetic properties of Dy2AlFe12Mn4 compound have been investigated by means of X-ray diffraction and magnetization measurements. The Dy2AlFe12Mn4 compound has a hexagonal Th2Ni17-type structure. Negative thermal expansion was found in Dy2AlFe12Mn4 compound from 229 to 280 K by X-ray dilatometry. The coefficient of the average thermal expansion is (-α) = -3.8×10-5 K-1. The magnetostrictive deformations from 105 to 270 K have been calculated by means of the differences between the experimental values of the lattice parameters and the corresponding values extrapolated from the paramagnetic range. The result shows that the spontaneous volume magnetostrictive deformation ωs decreases from 6.2 × 10-3 to near zero with the temperature increasing from 105 to 270 K, the spontaneous linear magnetostrictive deformation λc along the c axis is much larger than the spontaneous linear magnetostrictive deformation λa in basal-plane at the same temperature except close to 249 K.
参考文献
| [1] | Buschow K H J .Intermetallic compounds of rare-earth and 3d transition metals[J].Rep Phys,1977,40:1179. |
| [2] | Coey J M D;Sun H .Improved magnetic properties by treatment iron-based rare-earth intermetallic compounds in ammonia[J].Journal of Magnetism and Magnetic Materials,1990,87:251. |
| [3] | Zhong X P;Radwanski R J;de Boer F R;Jacobs T H Buschow K H J .Magnetic and crystallographic characteristics of rare-earth temary carbides derived from R2Fe17 compounds[J].Journal of Magnetism and Magnetic Materials,1990,86:333. |
| [4] | Andreev A V;de Boer F R;Jacobs T H;Buschow K H J .Thermal-expansion anomalies and spontaneous magnetostriction in R2Fe17Cx intermetallic compounds[J].Journal of Physics B:Atomic Molecular and Optical Physics,1991,175:361. |
| [5] | Hao Y M;Gao Y;Wang B W;Qu J P Li Y X Hu J F Deng J C .Nagative thermal expansion and magnetic properties of Y2Al3Fe14-xMnx compounds[J].Applied Physics Letters,2001,78:3277. |
| [6] | Zhang S Y;Shen B G;Zhang H W;Liang B Wang J Y Zhan W S Zhao J G .Magnetocrystalline anisotropy of Pr2(Fe1-xCox)1T-yGay compounds with a Th2Zn17-type structure[J].Journal of Applied Physiology,1998,84:5326. |
| [7] | Hao Y M;Zhao W;Gao Y .Structure and Curie temperature of Y2(Fe1-x-y Cox,Cry)17 compounds[J].Acta Phys Sin(in Chinese),2003,52:2612. |
| [8] | Hao YM.;Gao Y.;Qu JP.;Zhan Y. .Thermal expansion anomaly of Pr2AlFe13Mn3 compound near its Curie temperature and magnetic properties of Pr2AlFe16-xMnx compounds[J].Journal of Applied Physics,2002(10 Pt.3):8219-8221. |
| [9] | Andreev A V;Deryagin A V;Zadvorkin S M;Kudrevatykh N V Levitin R Z Moskalev V N Popov Y F Yumaguzhin R Y Mishin D D.Fizika Magnitnykh Materialov (Physics of Magnetic Materials)[M].Kalinin University,Kalinin,USSR,1985:21. |
| [10] | Wang Y G;Yang F M;Chen C P;Tang N Lin P H Wang Q D .Investigation of magnetic properties of Tb2Fe17-xMnx[J].Journal of Applied Physiology,1998,84:6229. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%