The impact of Pr and Nd substitution on structure, hysteresis and magnetocaloric properties of La1-x(Pr;Nd)XFe11.6Si1.4

2021 ◽  
Author(s):  
Amin Davarpanah ◽  
Iliya Radulov ◽  
Navid Shayanfar ◽  
Fernando Maccari ◽  
Konstantin Skokov ◽  
...  
Keyword(s):  
Magnetocaloric Properties ◽  
Nd Substitution ◽  
The Impact

Tuning the structural and magnetocaloric properties of Gd5Si2Ge2 with Nd substitution

2015 ◽  
Vol 117 (1) ◽  
pp. 013910 ◽  
Author(s):  
Bhagya Uthaman ◽  
G. R. Raji ◽  
Senoy Thomas ◽  
K. G. Suresh ◽  
Manoj Raama Varma
Keyword(s):  
Magnetocaloric Properties ◽  
Nd Substitution

Effect of Hydrogen on the Structure, Magnetic and Magnetocaloric Properties of Laves Phase Type-Compounds RE(Fe0.25Co0.75)2Hy with RE = Ho and Er, y = 0.0, 3.0, 3.5

2019 ◽  
Vol 289 ◽  
pp. 102-107 ◽  
Author(s):  
Ichrak Chaaba ◽  
Safa Othmani ◽  
Sonia Haj-Khlifa ◽  
Patricia de Rango ◽  
Daniel Fruchart
Keyword(s):  
Hydrogen Content ◽  
Single Phase ◽  
Cell Parameter ◽  
Maxwell Relation ◽  
Magnetization Saturation ◽  
Magnetocaloric Properties ◽  
Phase Type ◽  
Entropy Variation ◽  
3D Elements ◽  
The Impact

The crystal structure and overall magnetic properties of RE(Fe0.25Co0.75)2Hywith RE = Ho and Er, were analyzed versus y, the hydrogen content. The single phase C15 type compounds, synthesized using cold crucible HF melting, were hydrogenated and controlled using a PCI apparatus. The impact of hydrogen insertion on the cell parameter, the Curie temperature TCand the magnetization saturation were determined. All compounds and hydrides were found to be ferrimagnets, the magnetic moment of RE and 3d elements being opposite since Ho and Er belong to the 2ndrow of rare earth elements. Depending on the formula, a typical compensation point was in evidence. The 2ndorder character of the ferri ↔ paramagnetic transition was established using the Arrott plot method. Magnetization isotherms vs. magnetic field gives quantified results for the magnetic entropy variation by application of the Maxwell relation. Control of y, the hydrogen content, shows it is interesting for improvement of the MCE of the starting compounds. However increasing y leads to decreased TCat the lowest temperatures, suggesting potential cryogenic uses.

Effect of partial Nd-substitution on the magnetic and magnetocaloric properties in spin-reorientation PrCo4Al alloy

2011 ◽  
Vol 84 (2) ◽  
pp. 167-171 ◽  
Author(s):  
S. C. Ma ◽  
D. H. Wang ◽  
Z. C. Zhong ◽  
L. J. Shen ◽  
H. C. Xuan ◽  
...  
Keyword(s):  
Spin Reorientation ◽  
Magnetocaloric Properties ◽  
Nd Substitution

The impact of magnetocaloric properties on refrigeration performance and machine design

2017 ◽  
Vol 74 ◽  
pp. 576-583 ◽  
Author(s):  
M.A. Benedict ◽  
S.A. Sherif ◽  
M. Schroeder ◽  
D.G. Beers
Keyword(s):  
Machine Design ◽  
Magnetocaloric Properties ◽  
The Impact

Effect of Nd Substitution on the Structural and Magnetocaloric Properties of Gd5Si2Ge2

2015 ◽  
Vol 830-831 ◽  
pp. 501-504
Author(s):  
Bhagya Uthaman ◽  
Manoj Raama Varma
Keyword(s):  
Phase Transition ◽  
Curie Temperature ◽  
Magnetic Transition ◽  
Ferromagnetic Transition ◽  
First Order ◽  
Arc Melting ◽  
First Order Phase Transition ◽  
Magnetocaloric Properties ◽  
Nd Substitution ◽  
First Order Phase

In the present work, Nd substituted Gd5-xNdxSi2Ge2 with x = 0.05, 0.1 and 0.2 have been synthesized by arc melting and the effect of Nd substitution on the structural and magnetocaloric properties of Gd5Si2Ge2 has been investigated. The composition with x=0.05 undergoes a first order phase transition with a Curie temperature of 275 K. With the increase in Nd content to x=0.1 and x=0.2, the compounds undergo a second order magnetic transition at 300 K and 293 K respectively. Maximum entropy changes (-ΔSM) for Gd5-xNdxSi2Ge2 alloys with x = 0.05, 0.1 and 0.2 are 12.8, 7.6 and 7.2 J/kg K, respectively, for 50 kOe. The critical exponent analysis of the paramagnetic to ferromagnetic transition and the scaling behaviour of field dependence of MCE for x=0.1 and 0.2 compositions is also carried out.

Formation of Lunar Craters and Bright Rays as a Result of Meteorite Impacts

1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten
Keyword(s):  
Explosive Charge ◽  
The Moon ◽  
Meteorite Impacts ◽  
The Earth ◽  
Lunar Craters ◽  
The Impact

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

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