Magnetic ordering and coercivity of {Y, Tb}Ni4Si, NdNi3TSi (T = Mn - Cu) and Sm1-xTbxNi3FeSi solid solutions
| Autor: | Jinlei Yao, A.V. Morozkin, S. Quezado, Vasiliy O. Yapaskurt, Alexey V. Garshev, Satish K. Malik, R. Nirmala |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Analytical chemistry 02 engineering and technology Coercivity 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Inorganic Chemistry Paramagnetism Magnetization Ferromagnetism Materials Chemistry Ceramics and Composites Magnetic refrigeration Antiferromagnetism Crystallite Physical and Theoretical Chemistry 0210 nano-technology Solid solution |
| Zdroj: | Journal of Solid State Chemistry. 265:18-28 |
| ISSN: | 0022-4596 |
| Popis: | Magnetic ordering of the polycrystalline YNi4Si-type YNi4Si, disordered YNi4Si-type TbNi4Si and NdNi3CoSi (space group Cmmm, N 65, oC12), and CaCu5-type NdNi3TSi (T = Mn, Fe, Cu) and Sm1-xTbxNi3FeSi (x = 0.25 and 0.5) solid solutions (space group P6/mmm, N 191, hP6) have been studied by magnetization measurements. Down to 2 K, YNi4Si is paramagnetic, whereas TbNi4Si, NdNi3MnSi, NdNi3FeSi, NdNi3CoSi and NdNi3CuSi show ferromagnetic ordering (TC) at 30 K, 71 K, 120 K, 20 K and 5.6 K and field sensitive transitions (Tm) at 10 K, 43 K, 63 K, 16 K and 3.8 K, respectively. Sm.75Tb.25Ni3FeSi and Sm.5Tb.5Ni3FeSi show ferromagnetic-antiferromagnetic transformations below ferromagnetic ordering at 166 K and 120 K, respectively. Magnetocaloric effect (MCE) of TbNi4Si, NdNi3{Mn, Co, Cu}Si, Sm.75Tb.25Ni3FeSi and Sm.5Tb.5Ni3FeSi compounds were estimated in terms of isothermal magnetic entropy change (ΔSm). Among these compounds, TbNi4Si and NdNi3CuSi show maximal MCE with ΔSm of − 9.95 J/kg K (RCP50 kOe ~ 180 J/kg) at 26–30 K and − 6.29 J/kg K (RCP50 kOe ~ 31 J/K) at 6 K in a field change of 50 kOe, respectively. Below Tm, TbNi4Si, NdNi3MnSi, NdNi3FeSi, NdNi3CoSi, NdNi3CuSi and Sm.5Tb.5Ni3FeSi show hard magnetic properties with coercivity of 2.2 kOe, 4.8 kOe, 4.8 kOe, 9.5 kOe, 1 kOe and 15 kOe at 2 K, respectively. Sm.75Tb.25Ni3FeSi shows a coercivity of 39 kOe at 40 K. |
| Databáze: | OpenAIRE |
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