Abstract
NiMnSn ferromagnetic shape memory alloys exhibit martensitic transformation at low temperatures, restricting their applications. Therefore, this is a key factor in improving the martensitic transformation temperature, which is effectively carried out by proper element doping. In this research, we investigated the martensitic transformation and magnetic properties of Ni43Mn46-x SmxSn11 (x = 0, 1, 2, 3) alloys on the basis of structural and magnetic measurements. X-ray diffraction showed that the crystal structure transforms from the cubic L21 to the orthorhombic martensite and gamma (γ) phases. The reverse martensitic and martensitic transformations were indicated by exothermic and endothermic peaks in differential scanning calorimetry. The martensitic transformation temperature increased considerably with Sm doping and exceeded room temperature for Sm = 3 at. %. The Ni43Mn45SmSn11 alloy exhibited magnetostructural transformation, leading to a large magnetocaloric effect near room temperature. The existence of thermal hysteresis and the metamagnetic behavior of Ni43Mn45SmSn11 confirm the first-order magnetostructural transition. The magnetic entropy change reached 20 J·kg−1·K−1 at 266 K, and the refrigeration capacity reached ~162 J·Kg−1, for Ni43Mn45SmSn11 under a magnetic field variation of 0–5 T.
Highlights
The materials showing martensitic transformation (MT) exhibit various multifunctional phenomena, such as the magnetocaloric effect (MCE) [1,2], exchange bias (EB) [3,4,5], magnetothermal conductivity (MC) [6,7] and magnetoresistance (MR) [8,9,10]
The effect of Sm doping on martensitic transformation and the magnetic properties of
The results show that Sm doping changes the crystal structure from cubic L21 to orthorhombic martensite, with a fraction of the γ phase
Summary
The materials showing martensitic transformation (MT) exhibit various multifunctional phenomena, such as the magnetocaloric effect (MCE) [1,2], exchange bias (EB) [3,4,5], magnetothermal conductivity (MC) [6,7] and magnetoresistance (MR) [8,9,10]. This coupled transition is obtained around the MT temperature (Tt ).
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
