The effect of substitution of La for Tb on some physical properties of Tb1−xLaxNi2 solid solutions
| Autor: | J. Warchulska, Jacek Cwik, O.D. Chistyakov, G. S. Burkhanov, J. Klamut, Konstantin Nenkov, T. Palewski |
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| Rok vydání: | 2008 |
| Předmět: |
Curie–Weiss law
Condensed matter physics Chemistry Mechanical Engineering Metals and Alloys Thermodynamics Heat capacity symbols.namesake Magnetization Ferromagnetism Mechanics of Materials Materials Chemistry symbols Magnetic refrigeration Curie temperature Superstructure (condensed matter) Debye model |
| Zdroj: | Journal of Alloys and Compounds. 460:41-46 |
| ISSN: | 0925-8388 |
| Popis: | Experimental data on the structure, magnetization and heat capacity of polycrystalline Tb1−xLaxNi2 samples are represented. The X-ray diffraction performed at room temperature allowed us to reveal that the Tb1−xLaxNi2 solid solutions solidify with the formation of a Laves-phase superstructure corresponding to the F 4 ¯ 3 m space group; no Laves-phase structure is formed. Magnetic measurements showed that the samples with x ≤ 0.8 are ferromagnets with relatively low (below 36 K) Curie temperatures TC. Their Curie temperatures decrease from 36 K for TbNi2 to 8 K for Tb0.2La0.8Ni2. The samples of Tb0.1La0.9Ni2 and LaNi2 have no any long-range magnetic order in measurements temperature range, though the heat capacity measurements suggest a critical La content 90% and TC = 3 K. At high temperatures, all solid solutions are Curie–Weiss paramagnets. The heat capacity measurements have been performed for solid solutions Tb1−xLaxNi2 with x ≤ 0.5 and allowed us to determine the Debye temperature. The magnetocaloric effect was estimated from measurements performed in two magnetic field, 0.42 and 4.2 T. |
| Databáze: | OpenAIRE |
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