Direct measurements of the magnetocaloric effect of Fe49Rh51 using the mirage effect

2020 ◽  
Vol 127 (23) ◽  
pp. 233905
Author(s):  
A. A. Amirov ◽  
F. Cugini ◽  
A. P. Kamantsev ◽  
T. Gottschall ◽  
M. Solzi ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Mirage Effect ◽  
Direct Measurements

Millisecond direct measurement of the magnetocaloric effect of a Fe2P-based compound by the mirage effect

2016 ◽  
Vol 108 (1) ◽  
pp. 012407 ◽  
Author(s):  
F. Cugini ◽  
G. Porcari ◽  
C. Viappiani ◽  
L. Caron ◽  
A. O. dos Santos ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Direct Measurement ◽  
Mirage Effect

Direct measurements of magnetocaloric effect in the first-order system LaFe11.7Si1.3

2003 ◽  
Vol 93 (9) ◽  
pp. 5503-5506 ◽  
Author(s):  
F. X. Hu ◽  
Max Ilyn ◽  
A. M. Tishin ◽  
J. R. Sun ◽  
G. J. Wang ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Order System ◽  
First Order ◽  
Direct Measurements

Magnetic Phase Transitions and Magnetocaloric Effect in R2Fe17 (R = Y, Tb, Er)

2015 ◽  
Vol 233-234 ◽  
pp. 204-207 ◽  
Author(s):  
S.A. Nikitin ◽  
I.A. Ovchenkova ◽  
Georgiy A. Tskhadadze ◽  
Konstantin P. Skokov
Keyword(s):  
Transition Temperature ◽  
Magnetocaloric Effect ◽  
Magnetic Phase ◽  
Magnetic Transition ◽  
Exchange Interactions ◽  
Thermodynamic Theory ◽  
Magnetic Phase Transitions ◽  
Magnetic Transition Temperature ◽  
Local Fluctuations ◽  
Direct Measurements

The direct measurements of the magnetocaloric effect (MCE) and the magnetization for R2Fe17 (R = Y, Tb, Dy) compounds are reported. The maximal values of the MCE for different R2Fe17 compounds are almost the same at the Curie temperature and are equal to 0.8 – 0.85 K at ΛH = 13.5 kOe. The field dependencies of the magnetization and MCE and the dependence of MCE via magnetization deviates from the classical regularities and describes by the thermodynamic theory attracting the higher terms. Obviously the occurrence of the mixed exchange interactions in these compounds leads to the requirement of consideration both thermal and local fluctuations of the exchange integrals near the magnetic transition temperature.

The Magnetic Phase Transitions and Magnetocaloric Effect in the Ho(Co1-XAlx)2 and Tb(Co1-XAlx)2 Compounds

2010 ◽  
Vol 168-169 ◽  
pp. 119-121 ◽  
Author(s):  
S.A. Nikitin ◽  
G.A. Tskhadadze ◽  
I.A. Ovchenkova ◽  
D.A. Zhukova ◽  
T.I. Ivanova
Keyword(s):  
Phase Transitions ◽  
Curie Temperature ◽  
Magnetocaloric Effect ◽  
Magnetic Phase ◽  
Magnetic Ordering ◽  
Magnetic Phase Transitions ◽  
Al Content ◽  
Direct Measurements ◽  
Magnetic Ordering Temperature ◽  
Ferrimagnetic Structure

Direct measurements of the magnetocaloric effect (MCE) and magnetization have been conducted for the R(Co1-xAlx)2 (R = Tb, Ho) compounds. It was found that the small substitutions of Co by nonmagnetic Al lead to an increase both of the magnetic ordering temperature and the value of MCE. The following increase in Al content decreases the Curie temperature and the value of MCE. The analyses of the MCE effect is conducted considering the ferrimagnetic structure and the itinerant nature of these compounds.

Influence of Rapid Quenching on Magnetocaloric Effect of Y2(Fe,Mn)17 Intermetallic Compounds

2015 ◽  
Vol 233-234 ◽  
pp. 196-199 ◽  
Author(s):  
Alexey I. Zvonov ◽  
N.Yu. Pankratov ◽  
Dmitriy Karpenkov ◽  
Alexey Karpenkov ◽  
S.A. Nikitin
Keyword(s):  
Crystal Structure ◽  
Magnetocaloric Effect ◽  
Low Cost ◽  
Rapid Quenching ◽  
Glass Forming Ability ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Forming ◽  
Polycrystalline Alloys ◽  
Direct Measurements

The melt-spun Y2(Fe,Mn)17ribbons were synthesized by rapid quenching from the melt. The phase composition, crystal structure and magnetocaloric effect (MCE) in low-cost iron-based pseudo-binary Y2(Fe,Mn)17ribbons were investigated respectively by using x-ray diffraction and direct measurements of MCE. It was found that crystal structure of the as-spun ribbons retains hexagonal Th2Ni17-type because of the weak glass-forming ability. The Y2Fe14Mn3and Y2Fe13Mn4nanostructured ribbons demonstrate higher MCE compare to polycrystalline alloys.

scholarly journals Magnetocaloric Effect in Materials with the First Order Transitions - Direct Measurements

2010 ◽  
Vol 118 (5) ◽  
pp. 1000-1001 ◽  
Author(s):  
J. Kamarád ◽  
J. Kaštil ◽  
Z. Arnold ◽  
P. Javorský ◽  
V. Sechovský
Keyword(s):  
Magnetocaloric Effect ◽  
First Order ◽  
Direct Measurements

Magnetocaloric Effect of RCo5 Single Crystals in the Region of Spin-Reorientation Transitions

2010 ◽  
Vol 168-169 ◽  
pp. 134-137 ◽  
Author(s):  
Y.S. Koshkid’ko ◽  
Konstantin Skokov ◽  
Yury G. Pastushenkov ◽  
S.A. Nikitin ◽  
T.I. Ivanova
Keyword(s):  
Experimental Data ◽  
Curie Temperature ◽  
Magnetocaloric Effect ◽  
Single Crystals ◽  
Spin Reorientation ◽  
Direct Measurements ◽  
Good Accordance

Direct measurements of the magnetocaloric effect (MCE) in RCo5 single crystals in the region of spin-reorientation transitions (SRT) were carried out. It was shown that the values of MCE in the region of SRTs are comparable to the values of MCE in the vicinity of the Curie temperature. The anisotropy constants of the compounds were measured by the torque method. The anisotropic MCE calculation on the basis of anisotropy constants showed a good accordance with the experimental data.

Direct Measurements of Magnetocaloric Effect in a Single Crystalline Ni2.13Mn0.81Ga1.06 Heusler Alloy

2016 ◽  
Vol 872 ◽  
pp. 38-42
Author(s):  
Vladimir Khovaylo ◽  
Konstantin Skokov ◽  
Sergey Taskaev ◽  
Alexey Karpenkov ◽  
Dmitriy Karpenkov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Martensitic Transformation ◽  
Magnetocaloric Effect ◽  
Direct Method ◽  
Magnetic Transition ◽  
Martensitic Transformations ◽  
Austenitic Phase ◽  
Single Crystalline ◽  
First Order ◽  
Direct Measurements

Magnetocaloric effect (MCE) in the vicinity of first order martensitic transformation and second order magnetic transition in a single crystalline Ni2.13Mn0.81Ga1.06 Heusler compound was studied by a direct method. The obtained results revealed that, for the applied magnetic field strength μ0H = 1.9 T, MCE is irreversible in the vicinity of the first order martensitic transformation only when the MCE measurements are performed under cooling protocol. Plot of the experimentally measured adiabatic temperature change ΔTad as a function of temperature T indicated that ΔTad has a negligible benefit from the magnetic field-induced conversion of the high-temperature austenitic phase into the low-temperature martensitic phase and is mainly determined by the paraprocess of the austenitic phase around both direct and reverse martensitic transformations.

Magnetocaloric Effect in RСo2 Compounds

2012 ◽  
Vol 190 ◽  
pp. 339-342
Author(s):  
I.A. Ovchenkova ◽  
G.A. Tskhadadze ◽  
D.A. Zhukova ◽  
T.I. Ivanova ◽  
S.A. Nikitin
Keyword(s):  
Phase Transition ◽  
Rare Earth ◽  
Curie Temperature ◽  
Magnetocaloric Effect ◽  
Direct Measurements

The direct measurements of the magnetocaloric effect (MCE) and the magnetization have been conducted for a large number of compounds based on RCo2(R = Tb, Ho) with substitutions by nonmagnetic elements (Y, Al, Ga) in rare earth and 3d- sublattices. The concentration dependencies of the Curie temperature and the value of MCE are discussed. The linear dependencies of the value of the MCE from the second power of the magnetization were find out at the region of the phase transition of the second type .

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