Realization of Magnetostructural Transition and Magnetocaloric Properties of Ni–Mn–Mo–Sn Heusler Alloys

2018 ◽  
Vol 32 (3) ◽  
pp. 659-665
Author(s):  
Ishfaq Ahmad Shah ◽  
Najam ul Hassan ◽  
Abudu keremu ◽  
Saira Riaz ◽  
Shahzad Naseem ◽  
...  
Keyword(s):  
Heusler Alloys ◽  
Magnetostructural Transition ◽  
Magnetocaloric Properties

scholarly journals Influence of the transition width on the magnetocaloric effect across the magnetostructural transition of Heusler alloys

2016 ◽  
Vol 374 (2074) ◽  
pp. 20150306 ◽  
Author(s):  
F. Cugini ◽  
G. Porcari ◽  
S. Fabbrici ◽  
F. Albertini ◽  
M. Solzi
Keyword(s):  
Magnetocaloric Effect ◽  
Heusler Alloys ◽  
Entropy Change ◽  
Large Temperature ◽  
Transition Width ◽  
Critical Temperatures ◽  
Magnetostructural Transition ◽  
Magnetocaloric Properties ◽  
Clear Result ◽  
Effective Use

We report a complete structural and magneto-thermodynamic characterization of four samples of the Heusler alloy Ni-Co-Mn-Ga-In, characterized by similar compositions, critical temperatures and high inverse magnetocaloric effect across their metamagnetic transformation, but different transition widths. The object of this study is precisely the sharpness of the martensitic transformation, which plays a key role in the effective use of materials and which has its origin in both intrinsic and extrinsic effects. The influence of the transition width on the magnetocaloric properties has been evaluated by exploiting a phenomenological model of the transformation built through geometrical considerations on the entropy versus temperature curves. A clear result is that a large temperature span of the transformation is unfavourable to the magnetocaloric performance of a material, reducing both isothermal entropy change and adiabatic temperature change obtainable in a given magnetic field and increasing the value of the maximum field needed to fully induce the transformation. The model, which is based on standard magnetometric and conventional calorimetric measurements, turns out to be a convenient tool for the determination of the optimum values of transformation temperature span in a trade-off between sheer performance and amplitude of the operating range of a material. This article is part of the themed issue ‘Taking the temperature of phase transitions in cool materials’.

scholarly journals Magnetocaloric properties of the Ni2Mn1−x(Cu,Co)xGa Heusler alloys

2006 ◽  
Vol 99 (8) ◽  
pp. 08Q106 ◽  
Author(s):  
A. M. Gomes ◽  
M. Khan ◽  
S. Stadler ◽  
N. Ali ◽  
I. Dubenko ◽  
...  
Keyword(s):  
Heusler Alloys ◽  
Magnetocaloric Properties

Tailoring the magnetostructural transition and magnetocaloric properties around room temperature: In-doped Ni-Mn-Ga alloys

2014 ◽  
Vol 105 (11) ◽  
pp. 112402 ◽  
Author(s):  
Linfang Zhang ◽  
Jingmin Wang ◽  
Hui Hua ◽  
Chengbao Jiang ◽  
Huibin Xu
Keyword(s):  
Room Temperature ◽  
Magnetostructural Transition ◽  
Magnetocaloric Properties

The magnetostructural transition and magnetocaloric properties in Fe0.6Mn0.4NiSi1−xAlx alloys

2020 ◽  
Vol 128 (1) ◽  
pp. 013904
Author(s):  
L. Lei ◽  
Z. G. Zheng ◽  
S. Jin ◽  
W. H. Wang ◽  
C. F. Li ◽  
...  
Keyword(s):  
Magnetostructural Transition ◽  
Magnetocaloric Properties

scholarly journals Visualization of magnetostructural transition in Heusler alloys by Magnetic Force Microscopy

2018 ◽  
Vol 185 ◽  
pp. 05004
Author(s):  
Pavel Geydt ◽  
Igor D. Rodionov ◽  
Alexander B. Granovsky ◽  
Ekaterina Soboleva ◽  
Egor Fadeev ◽  
...  
Keyword(s):  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Domain Walls ◽  
Heusler Alloys ◽  
Scanning Probe ◽  
Magnetic Domains ◽  
Magnetic Signal ◽  
Force Microscopy ◽  
Magnetostructural Transition ◽  
Probe Microscope

Magnetostructural transition was observed in Ni-Mn-In-Cr Heusler alloy with help of Magnetic Force Microscopy (MFM). The crystal structure of a sample and characteristic temperatures of the phase transition were controlled by roentgenostructural phase analysis and magnetometry, respectively. It appeared prominently important to prepare the surface of the sample until the nanometer level of surface roughness. Magnetic study performed with scanning probe microscope revealed existence of magnetic domains, which were spread across the surface evenly. Further studies revealed that intensity of magnetic signal decreases as fading out of the contrast of the MFM images. It was found that location of domains shifted after the heating/cooling cycle above Curie temperature for the studied alloy. Location of new domain walls appeared correlating with surface scrapings and defects, whilst it became independent from those after heating until just 70°C. The mechanism behind the observed transition is proposed.

Effect of Si substitution on the Structural, Magnetic and Magnetocaloric Properties of Ni–Mn–In Heusler alloys

2020 ◽  
Vol 126 (6) ◽  
Author(s):  
N. Pavan Kumar ◽  
Manvir Singh ◽  
Vishal Mahey ◽  
Suyesh Nautiyal ◽  
D. M. Raj Kumar ◽  
...  
Keyword(s):  
Heusler Alloys ◽  
Magnetocaloric Properties

Experimental Study of Magnetocaloric Effect in Ni-Fe-Mn-Ga and Ni-Co-Mn-Ga Heusler Alloys

2013 ◽  
Vol 738-739 ◽  
pp. 456-460 ◽  
Author(s):  
Rafael Fayzullin ◽  
Vasiliy D. Buchelnikov ◽  
Sergey Taskaev ◽  
Mikhail Drobosyuk ◽  
Vladimir V. Khovaylo
Keyword(s):  
Martensitic Transformation ◽  
Curie Temperature ◽  
Magnetocaloric Effect ◽  
Temperature Increase ◽  
Direct Method ◽  
Heusler Alloys ◽  
Iron Concentration ◽  
Magnetostructural Transition ◽  
Phase Transition Temperatures ◽  
Magnetic Field Change

In this work we experimentally studied the MCE in the Heusler alloys Ni2.19-xFexMn0.81Ga (x = 0.01, 0.02, 0.03, 0.04) and Ni2.16-xCoxMn0.84Ga (x = 0.03, 0.06, 0.09). Magnetocaloric effect was measured by the direct method using the installation from the company AMT&C. The temperature dependencies of ∆Tad for the magnetic field change ∆H = 2 T were measured. The phase transition temperatures were determined from temperature dependencies of low field magnetization measured by original setup using Hall effect. Studies have shown that replacement of the Ni atoms with the iron atoms slightly reduces the temperature magnetostructural transition for x = 0.01,0.02, and starting with x = 0.03, magnetic and structural transitions occur separately and a further increase in iron concentration leads to the Curie temperature increase, while the temperature martensitic transformation decreases. When replacing the Ni atoms with the Co atoms of the martensitic transformation temperature and Curie temperature increase.

scholarly journals Magnetocaloric properties of the single crystal Mn0.99Fe0.01As

2019 ◽  
Vol 55 (1) ◽  
pp. 118-124
Author(s):  
G. A. Govor ◽  
A. O. Larin ◽  
V. I. Mitsiuk ◽  
G. S. Rimskiy ◽  
T. M. Tkachenkа
Keyword(s):  
Magnetic Field ◽  
Crystal Structure ◽  
Phase Transition ◽  
Phase Transitions ◽  
External Magnetic Field ◽  
Single Crystal ◽  
Single Crystals ◽  
Calculation Method ◽  
Magnetostructural Transition ◽  
Magnetocaloric Properties

The Stockbargard – Bridgman method yielded single crystals Mn0.99Fe0.01As. The effect of an external magnetic field with an intensity of up to 10 T on phase transitions in the single crystal Mn0.99Fe0.01As is studied. It is established that the magnetostructural phase transition in Mn0.99Fe0.01As is accompanied by a change in the entropy ΔSm, which is due to the transformation of the crystal structure. At temperatures above the temperature of the magnetostructural transition Tu = 290 K, the existence of an unstable magnetic structure is obtained. The magnetocaloric characteristics of the material under study are determined by an indirect calculation method based on the Maxwell thermodynamic relations and the Clapeyron – Clausius equation.

scholarly journals Martensitic Transformation, Thermal Analysis and Magnetocaloric Properties of Ni-Mn-Sn-Pd Alloys

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1582
Author(s):  
Asma Wederni ◽  
Mihail Ipatov ◽  
Eloi Pineda ◽  
Lluisa Escoda ◽  
Julian-Maria González ◽  
...  
Keyword(s):  
Structural Transition ◽  
Magnetic Measurements ◽  
Heusler Alloys ◽  
Martensitic Transition ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Enthalpy Changes ◽  
Magnetocaloric Properties ◽  
Pd Doping ◽  
Peak Value

Martensitic transition and magnetic response of Ni50−x Pdx,y Mn36 Sn14−y (x = 0, 1, 2 and y = 0, 1) Heusler alloys were analysed. The crystalline structure of each composition was solved by X-ray diffraction pattern fitting. For x = 1 and 2, the L21 austenite structure is formed and, for y = 1, the crystallographic phase is a modulated martensitic structure. From differential scanning calorimetry scans, we determine characteristic transformation temperatures and the entropy/enthalpy changes. The temperatures of the structural transformation increase with the addition of Pd to replace Ni or Sn, whereas the austenitic Curie temperature remains almost unvarying. In addition, the magneto-structural transition, investigated by magnetic measurements, is adjusted by suitable Pd doping in the alloys. The peak value of the magnetic entropy changes reached 4.5 J/(kg K) for Ni50Mn36Sn13Pd1 (external field: 50 kOe).

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