Tuning of the Structure and Magnetocaloric Effect of Mn1−xZrxCoGe Alloys (Where x = 0.03, 0.05, 0.07, and 0.1)
| Autor: | Karolina Kutynia, Piotr Gębara |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Diffraction
Technology magnetocaloric effect Materials science Article Lattice constant Magnetic refrigeration General Materials Science Microscopy QC120-168.85 Rietveld refinement QH201-278.5 Doping Engineering (General). Civil engineering (General) TK1-9971 X-ray diffraction Crystallography Descriptive and experimental mechanics X-ray crystallography Heusler alloys Curie temperature Orthorhombic crystal system Electrical engineering. Electronics. Nuclear engineering TA1-2040 |
| Zdroj: | Materials Materials; Volume 14; Issue 11; Pages: 3129 Materials, Vol 14, Iss 3129, p 3129 (2021) |
| ISSN: | 1996-1944 |
| Popis: | The aim of the present work is to study the influence of a partial substitution of Mn by Zr in MnCoGe alloys. The X-ray diffraction (XRD) studies revealed a coexistence of the orthorhombic TiNiSi-type and hexagonal Ni2In- type phases. The Rietveld analysis showed that the changes in lattice constants and content of recognized phases depended on the Zr addition. The occurrence of structural transformation was detected. This transformation was confirmed by analysis of the temperature dependence of exponent n given in the relation ΔSM = C·(BMAX)n. A decrease of the Curie temperature with an increase of the Zr content in the alloy composition was detected. The magnetic entropy changes were 6.93, 13.42, 3.96, and 2.94 J/(kg K) for Mn0.97Zr0.03CoGe, Mn0.95Zr0.05CoGe, Mn0.93Zr0.07CoGe, and Mn0.9Zr0.1CoGe, respectively. A significant rise in the magnetic entropy change for samples doped by Zr (x = 0.05) was caused by structural transformation. |
| Databáze: | OpenAIRE |
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