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Magnetism and Thermomechanical Properties in Si Substituted MnCoGe Compounds
| Content Provider | MDPI |
|---|---|
| Author | Rahman, Abdul Din, Muhamad Wang, Jianli Suhaimi, Nur Idris, Nurul Dou, Shi Ismail, Mohammad Hassan, Muhammad Jusoh, Mohd |
| Copyright Year | 2021 |
| Description | MnCoGe-based compounds have been increasingly studied due to their possible large magnetocaloric effect correlated to the magnetostructural coupling. In this research, a comprehensive study of structure, magnetic phase transition, magnetocaloric effect and thermomechanical properties for $MnCoGe_{1−x}Si_{x}$ is reported. Room temperature X-ray diffraction indicates that the $MnCoGe_{1−x}Si_{x}$ (x = 0, 0.05, 0.1, 0.15 and 0.2) alloys have a major phase consisting of an orthorhombic TiNiSi-type structure with increasing lattice parameter b and decreasing others (a and c) with increasing Si concentration. Along with M-T and DSC measurements, it is indicated that the $T_{c}$ value increased with higher Si concentration and decreased for structural transition temperature $T_{str}$. The temperature dependence of the magnetization curves overlaps completely, indicating that there is no thermal hysteresis, and it is shown that the transition is the second-order type. It is also shown that the decreased magnetization on the replacement of Si for Ge decreases the value of $−ΔS_{M}$ from $−ΔS_{M}$~8.36 J $kg^{−1}$ $K^{−1}$ at x = 0 to $−ΔS_{M}$~5.49 J $kg^{−1}$ $K^{−1}$ at x = 0.2 with 5 T applied field. The performed Landau theory has confirmed the second-order transition in this study, which is consistent with the Banerjee criterion. The magnetic measurement and thermomechanical properties revealed the structural transition that takes place with Si substitution of Ge. |
| Starting Page | 694 |
| e-ISSN | 20734352 |
| DOI | 10.3390/cryst11060694 |
| Journal | Crystals |
| Issue Number | 6 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-06-17 |
| Access Restriction | Open |
| Subject Keyword | Crystals Thermomechanical Properties Second-order Magnetic Transition Magnetocaloric Effect Mncoge Magnetic Refrigeration |
| Content Type | Text |
| Resource Type | Article |
