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

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

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 Phase Transitions and Magnetocaloric Properties in MnCo1−xZrxGe Compounds

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Anil Aryal ◽  
Abdiel Quetz ◽  
Sudip Pandey ◽  
Igor Dubenko ◽  
Shane Stadler ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Ferromagnetic State ◽  
Partial Substitution ◽  
Cooling Power ◽  
Martensitic Transition ◽  
Ferromagnetic Transition ◽  
Scanning Calorimetry ◽  
Magnetostructural Transition ◽  
Magnetocaloric Properties ◽  
Single Transition

The structural, magnetic, and magnetocaloric properties of MnCo1-xZrxGe (0.01≤x≤0.04) have been studied through X-ray diffraction, differential scanning calorimetry, and magnetization measurements. Results indicate that the partial substitution of Zr for Co in MnCo1-xZrxGe decreases the martensitic transition temperature (TM). For x = 0.02, TM was found to coincide with the ferromagnetic transition temperature (TC) resulting in a first-order magnetostructural transition (MST). A further increase in zirconium concentration (x = 0.04) showed a single transition at TC. The MST from the paramagnetic to ferromagnetic state results in magnetic entropy changes (-ΔSM) of 7.2 J/kgK for ΔH = 5 T at 274 K for x = 0.02. The corresponding value of the relative cooling power (RCP) was found to be 266 J/kg for ΔH = 5 T. The observed large value of MCE and RCP makes this system a promising material for magnetic cooling applications.

Magnetocaloric Properties and Magnetic Anisotropy by Tailoring Phase Transitions in NiMnGa Alloys

2008 ◽  
Vol 583 ◽  
pp. 169-196 ◽  
Author(s):  
Franca Albertini ◽  
Massimo Solzi ◽  
Antonio Paoluzi ◽  
Lara Righi
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetocaloric Effect ◽  
Magnetic Transition ◽  
Critical Temperatures ◽  
First Order ◽  
Magnetostructural Transition ◽  
Thermomagnetic Analysis ◽  
Magnetocaloric Properties ◽  
Giant Magnetocaloric Effect ◽  
Composition Changes

The giant magnetocaloric properties of NiMnGa alloys can be enhanced by suitable composition changes that make structural and magnetic transition temperatures to coincide. In this paper we report results on critical temperatures, magnetic anisotropy, and magnetocaloric effect in Ni- and Mn-rich alloys as a function of composition. A phenomenological phase diagram, useful for the identification by thermomagnetic analysis of magnetic and structural transitions in the vicinity of their coincidence, is proposed. Particular emphasis is given to the discussion of giant magnetocaloric effect of those alloys showing a first order magnetostructural transition, the method of its determination, and the potentialities for applications in the field of magnetic refrigeration.

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

First-principles and Monte Carlo study of magnetostructural transition and magnetocaloric properties ofNi2+xMn1−xGa

2010 ◽  
Vol 81 (9) ◽  
Author(s):  
V. D. Buchelnikov ◽  
V. V. Sokolovskiy ◽  
H. C. Herper ◽  
H. Ebert ◽  
M. E. Gruner ◽  
...  
Keyword(s):  
Monte Carlo ◽  
First Principles ◽  
Monte Carlo Study ◽  
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’.

Effects of A-site cation disorder on structure and magnetocaloric properties in Y and Sr codoped La2∕3Ca1∕3MnO3 compounds

2009 ◽  
Vol 105 (7) ◽  
pp. 07D713 ◽  
Author(s):  
Qing Ji ◽  
Bin Lv ◽  
P. F. Wang ◽  
H. L. Cai ◽  
X. S. Wu ◽  
...  
Keyword(s):  
Cation Disorder ◽  
Magnetocaloric Properties ◽  
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