scholarly journals Enhanced Refrigeration Capacity of Rare-Earth-Free Ni-Co-Mn-In-Si Heusler Alloys for Magnetic Refrigerants

2021 ◽  
Author(s):  
Shaleni Venkatesan ◽  
Meher Abhinav E ◽  
Kavita S ◽  
Pavan Kumar N ◽  
Manivel raja M ◽  
...  
Keyword(s):  
Rare Earth ◽  
Heusler Alloys ◽  
Refrigeration Capacity

scholarly journals Optimizing the Caloric Properties of Cu-Doped Ni–Mn–Ga Alloys

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 419 ◽  
Author(s):  
Concepcio Seguí ◽  
Joan Torrens-Serra ◽  
Eduard Cesari ◽  
Patricia Lázpita
Keyword(s):  
Magnetic Field ◽  
Solid State ◽  
Thermal Hysteresis ◽  
Heusler Alloys ◽  
Magnetic Contribution ◽  
Temperature Hysteresis ◽  
Magnetostructural Transition ◽  
Cu Content ◽  
Working Temperature ◽  
Refrigeration Capacity

With the purpose to optimize the functional properties of Heusler alloys for their use in solid-state refrigeration, the characteristics of the martensitic and magnetic transitions undergone by Ni50Mn25−xGa25Cux (x = 3–11) alloys have been studied. The results reveal that, for a Cu content of x = 5.5–7.5, a magnetostructural transition between paramagnetic austenite and ferromagnetic martensite takes place. In such a case, magnetic field and stress act in the same sense, lowering the critical combined fields to induce the transformation; moreover, magnetocaloric and elastocaloric effects are both direct, suggesting the use of combined fields to improve the overall refrigeration capacity of the alloy. Within this range of compositions, the measured transformation entropy is increased owing to the magnetic contribution to entropy, showing a maximum at composition x = 6, in which the magnetization jump at the transformation is the largest of the set. At the same time, the temperature hysteresis of the transformation displays a minimum at x = 6, attributed to the optimal lattice compatibility between austenite and martensite. We show that, among this system, the optimal caloric performance is found for the x = 6 composition, which displays high isothermal entropy changes (−36 J·kg−1·K−1 under 5 T and −8.5 J·kg−1·K−1 under 50 MPa), suitable working temperature (300 K), and low thermal hysteresis (3 K).

Structural transformation studies on the rare earth containing Heusler alloys Pd2RESn

1985 ◽  
Vol 53 (11) ◽  
pp. 1029-1032 ◽  
Author(s):  
A.M. Umarji ◽  
S.K. Malik ◽  
G.K. Shenoy
Keyword(s):  
Rare Earth ◽  
Structural Transformation ◽  
Heusler Alloys ◽  
The Rare Earth

Magnetocaloric effects and transport properties of rare-earth (R = La, Pr, Sm) doped Ni50-xRxMn35Sn15 Heusler alloys

2017 ◽  
Vol 717 ◽  
pp. 254-259 ◽  
Author(s):  
Anil Aryal ◽  
Abdiel Quetz ◽  
Sudip Pandey ◽  
Igor Dubenko ◽  
Shane Stadler ◽  
...  
Keyword(s):  
Rare Earth ◽  
Transport Properties ◽  
Heusler Alloys

Impurities in Magnetic Materials Studied by PAC Spectroscopy

2011 ◽  
Vol 311 ◽  
pp. 39-61 ◽  
Author(s):  
Artur Wilson Carbonari ◽  
José Mestnik-Filho ◽  
Rajendra Narain Saxena
Keyword(s):  
Rare Earth ◽  
Transition Metal ◽  
Magnetic Fields ◽  
Rare Earth Elements ◽  
Magnetic Hyperfine Field ◽  
Heusler Alloys ◽  
Local Fields ◽  
Pac Spectroscopy ◽  
Open Issue ◽  
Local Magnetic Fields

Perturbed gamma-gamma angular correlation (PAC) spectroscopy is a precise and highly efficient tool to follow the temperature dependence of local magnetic fields in any material. Its resolution and efficiency does not depend on temperature and therefore can measure local fields at low as well as high temperature with the same accuracy. Due its versatility in using different probe nuclei it can sense the local magnetic fields at different sites in the crystalline structure of materials. In this review, important results obtained with PAC spectroscopy are shown in two classes of materials: transition metal and transition-metal based compounds and rare earth elements and rare-earth-element based compounds using mainly three different probe nuclei:111Cd,181Ta and140Ce. PAC spectroscopy has contributed to the systematic study of the magnetic hyperfine field in impurities in matrices of Fe, Co and Ni as well as in transition-metal based Heusler alloys. It has also provided important contribution to the investigation of magnetism in rare-earth elements and intermetallic compounds. An still open issue concerning the local fields in metallic magnetic compounds and elements is the exchange interaction between the magnetic ions of the host and a dilute magnetic impurity, which acts as a defect in the magnetic lattice. PAC spectroscopy has been contributing to study this problem with success. Also shown in this review is the crucial role of ab-initio first principle calculations in the interpretation of PAC results.

Thermoelectric properties of rare-earth doped Fe2VAl Heusler alloys

2020 ◽  
Vol 32 (35) ◽  
pp. 355706
Author(s):  
Sudhakara Rao Hari ◽  
V Srinivas ◽  
C R Li ◽  
Y K Kuo
Keyword(s):  
Rare Earth ◽  
Thermoelectric Properties ◽  
Heusler Alloys ◽  
Rare Earth Doped

scholarly journals Author Correction: Strain-tunable triple point Fermions in diamagnetic rare-earth half-Heusler alloys

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Anupam Bhattacharya ◽  
Vishal Bhardwaj ◽  
Brajesh K. Mani ◽  
Jayanta K. Dutt ◽  
Ratnamala Chatterjee
Keyword(s):  
Rare Earth ◽  
Triple Point ◽  
Heusler Alloys

The effect of pressure on the curie temperature and resistivity of some rare-earth metals and heusler alloys

1967 ◽  
Vol 15 (135) ◽  
pp. 529-538 ◽  
Author(s):  
I. G. Austin ◽  
P. K. Mishra
Keyword(s):  
Rare Earth ◽  
Curie Temperature ◽  
Rare Earth Metals ◽  
Heusler Alloys ◽  
Effect Of Pressure

Effect of Rare-earth Doping on the Thermoelectric Properties of the Tin-based Half-Heusler Alloys

2010 ◽  
Vol 25 (6) ◽  
pp. 573-576 ◽  
Author(s):  
Xiao-Guang LI ◽  
De-Xuan HUO ◽  
Cai-Jun HE ◽  
Shi-Chao ZHAO ◽  
Yan-Fei Lü
Keyword(s):  
Rare Earth ◽  
Thermoelectric Properties ◽  
Heusler Alloys ◽  
Rare Earth Doping

scholarly journals Designing Rare-Earth Free Permanent Magnets in Heusler Alloys Via Interstitial Doping

2019 ◽  
Author(s):  
Qiang Gao ◽  
Ingo Opahle ◽  
Oliver Gutfleisch ◽  
Hongbin Zhang
Keyword(s):  
Rare Earth ◽  
Permanent Magnets ◽  
Heusler Alloys

Magnetic structures of the rare earth heusler alloys Pd2DySn and Pd2HoSn

1987 ◽  
Vol 127 ◽  
pp. 93-98 ◽  
Author(s):  
R.L. Donaberger ◽  
C.V. Stager
Keyword(s):  
Rare Earth ◽  
Heusler Alloys ◽  
Magnetic Structures ◽  
The Rare Earth
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