التفاصيل البيبلوغرافية
| العنوان: |
LaFeSi–LaFe13−xSix composites: Modulating magnetic and magnetocaloric properties through inherent stress manipulation. |
| المؤلفون: |
Del Rose, Tyler J., Chouhan, Rajiv K., Doyle, Andrew, Pathak, Arjun K., Mudryk, Yaroslav |
| المصدر: |
Journal of Applied Physics; 7/21/2024, Vol. 136 Issue 3, p1-13, 13p |
| مصطلحات موضوعية: |
MAGNETIC transitions, MAGNETIC properties, FIRST-order phase transitions, MAGNETIC fields, TEMPERATURE control, MAGNETIC entropy |
| مستخلص: |
We examine structural and magnetic properties of a series of La–Fe–Si alloys in the region of concentrations where they naturally form two-phase LaFeSi–LaFe13−xSix composites with variable content and connectivity of LaFe13−xSix grains distributed within the LaFeSi matrix. Theoretical calculations confirm that the LaFeSi constituent is magnetically and structurally inert below room temperature and at pressures between −10 and 10 GPa. The LaFe13−xSix constituent, on the other hand, is magnetically and structurally active: it exhibits first-order magnetostructural transformations that, in addition to xSi, can be controlled with temperature, magnetic field, and pressure. In composites where the concentration of the inactive constituent is ∼70 wt. % or greater, the standard, single-step, LaFe13−xSix first-order phase transformation proceeds in two steps separated by over 30 K in a zero magnetic field. Increasing the magnetic field recouples the two steps and restores the single-step phase transformation pathway. We analyze the roles of stresses caused by both thermal expansion mismatch and the first-order magnetic phase transition in LaFe13−xSix to rationalize the observed physical behaviors that emerge as the temperature or/and magnetic field vary. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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