Effect of co-site dilution on the magnetism ofRCo5(R= Gd, Y) compounds
| Autor: | A.V. Knotko, A.V. Morozkin, S. Quezado, R. Nirmala, Satish K. Malik, S.A. Nikitin, I.A. Ovchenkova, Andrey Smirnov, A.E. Bogdanov, Vasiliy O. Yapaskurt |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Polymers and Plastics Magnetic moment Magnetism Metals and Alloys Analytical chemistry 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences 010305 fluids & plasmas Surfaces Coatings and Films Electronic Optical and Magnetic Materials Magnetic field Biomaterials Paramagnetism 0103 physical sciences Magnetic refrigeration Curie temperature 0210 nano-technology Néel temperature |
| Zdroj: | Materials Research Express. 5:036109 |
| ISSN: | 2053-1591 |
| DOI: | 10.1088/2053-1591/aab69a |
| Popis: | The magnetic and magnetocaloric properties of the RCo5−x Ga x (R = Gd, Y; x = 1, 1.5, 1.6, 1.7) compounds have been studied. X-ray and electron microprobe analysis show that the samples are single phase and crystallize in the hexagonal CaCu5 - type structure (space group P6/mmm, N 191, hP6). The magnetic properties have been studied from 2 to 400 K under magnetic fields in the region of 1 to 140 kOe. With increasing Ga amount the magnetic ordering temperature decreases rapidly. The increase in Ga concentration leads to the reduction of the magnetic moment of Co sublattice and the Curie temperature. It has been found that the paramagnetic susceptibility follows the Neel-type law for GdCo5−x Ga x (x = 1.5, 1.6, 1.7) and the Curie-Weiss law for YCo3.3Ga1.7. The molecular field coefficients and sublattice magnetizations were determined on a basis of the Neel theory and experimental data. The magnetocaloric effect and refrigerant capacity have been estimated over a wide temperature range of 10–350 K. |
| Databáze: | OpenAIRE |
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