Cryogenic Magnetocaloric Effect in Distorted Double-perovskite Gd2ZnTiO6

2021 ◽  
Author(s):  
Ziyu Yang ◽  
Jun-Yi Ge ◽  
Shuangchen Ruan ◽  
Hongzhi Cui ◽  
Yu-Jia Zeng
Keyword(s):  
Heat Capacity ◽  
Magnetic Entropy Change ◽  
Mean Field ◽  
Double Perovskite ◽  
Entropy Change ◽  
Field Analysis ◽  
Magnetic Entropy ◽  
Static Magnetization ◽  
Magnetocaloric Properties ◽  
Heat Capacity Measurements

Herein, we report on the magnetic and magnetocaloric properties of a distorted double-perovskite, Gd2ZnTiO6, through static magnetization, heat capacity measurements, and mean-field analysis. The most pronounced isothermal magnetic entropy change...

Magnetocaloric Effect in RFe10X2( X=Mo, V)

2018 ◽  
Vol 1 (1) ◽  
pp. 102-113
Author(s):  
Raghda Abu El-Nasr ◽  
Samy H. Aly ◽  
Sherif Yehia ◽  
Hala A. Sobh
Keyword(s):  
Heat Capacity ◽  
Magnetocaloric Effect ◽  
Magnetic Entropy Change ◽  
Mean Field ◽  
Entropy Change ◽  
Field Analysis ◽  
Electronic Contribution ◽  
Sublattice Model ◽  
Magnetic Entropy ◽  
Field Change

We present a mean-field study on the magnetocaloric effect (MCE) in RFe10X2, where X=Mo, V, and R=Gd, Tb, Ho, Tm, Dy, Er, Nd for X=V. For X=Mo, R=Dy, Gd, and Nd. The two-sublattice model, involving the 4f (rare earth) and 3d(Fe) sublattices, is used. For both systems, magnetization, magnetic heat capacity, magnetic entropy and isothermal entropy change ∆Sm are calculated for different magnetic fields in the 0-5T range and the temperature range from 0 to 700K. Direct and inverse MCEs are shown to take place in these ferromagnetic/ferrimagnetic compounds. For a field change ∆H=5T, the maximum isothermal magnetic entropy change has been calculated for ferromagnetic NdFe10Mo2 compound to be 6.6 J/K mol at Tc=441 K. Both direct, and inverse MCEs have been found in ferrimagnetic compounds, e.g., for TmFe10V2, with maximum -∆Sm= J/K mol at Tc=521K and ∆Sm=  J/K mol at TN=127 K. Mean-field analysis is suitable for handling the systems we report on. Further study on the lattice and electronic contribution to entropy is planned.

Comparative Study of the Magnetocaloric Properties in Ni-Mn-X (X = Ga, In, Sn) by Magnetization and Specific Heat Measurements

2009 ◽  
Vol 1200 ◽  
Author(s):  
V V Khovaylo ◽  
K P Skokov ◽  
E V Avilova ◽  
Val Novosad ◽  
H Miki ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
Ferromagnetic Shape Memory Alloys ◽  
First Order ◽  
Magnetocaloric Properties ◽  
Heat Capacity Measurements ◽  
Capacity Data ◽  
Ferromagnetic Shape Memory

AbstractSome compositions of Ni-Mn-X (X = Ga, In, Sn) ferromagnetic shape memory alloys exhibit a first order magnetostructural phase transition. Magnetic entropy change ΔSm in the vicinity of this transition has been studied by magnetization and heat capacity measurements. Comparison of these results point to a large difference in magnitudes of ΔSm obtained from magnetization and heat capacity data. It is suggested that this discrepancy originates from overestimation of \Delta S_m determined from the magnetization measurements and underestimation of ΔSm obtained from the heat capacity measurements.

scholarly journals Critical phenomena and estimation of the spontaneous magnetization from a mean field analysis of the magnetic entropy change in La0.7Ca0.1Pb0.2Mn0.95Al0.025Sn0.025O3

RSC Advances ◽  
2018 ◽  
Vol 8 (6) ◽  
pp. 3099-3107 ◽  
Author(s):  
Khadija Dhahri ◽  
N. Dhahri ◽  
J. Dhahri ◽  
K. Taibi ◽  
E. K. Hlil
Keyword(s):  
Critical Phenomena ◽  
Critical Behavior ◽  
Magnetic Entropy Change ◽  
Spontaneous Magnetization ◽  
Mean Field ◽  
Entropy Change ◽  
Field Analysis ◽  
Perovskite Manganite ◽  
Magnetic Entropy

In the present work, we have studied the universal critical behavior in the perovskite-manganite compound La0.7Ca0.1Pb0.2Mn0.95Al0.025Sn0.025O3.

scholarly journals Magnetocaloric effect in Sr2FeMoO6/Ag composites

2015 ◽  
Vol 9 (1) ◽  
pp. 11-15 ◽  
Author(s):  
Mahmoud Hamad
Keyword(s):  
Magnetocaloric Effect ◽  
Magnetic Entropy Change ◽  
Double Perovskite ◽  
Entropy Change ◽  
Heat Capacity Change ◽  
Cooling Power ◽  
Magnetic Entropy ◽  
Low Field ◽  
Capacity Change ◽  
Magnetocaloric Properties

The enhanced low-field magnetocaloric effect was investigated for double perovskite Sr2FeMoO6 - silver (SFMO/Ag) composites with 0, 5 and 10 wt.% of Ag. A phenomenological model was used to predict magnetocaloric properties of SFMO/Ag composites, such as magnetic entropy change, heat capacity change and relative cooling power. It was shown that magnetic entropy change (?S M) peaks of SFMO/Ag span over a wide temperature region, which can significantly improve the global efficiency of the magnetic refrigeration. Furthermore, the ?S M distribution of the SFMO/Ag composites is much more uniform than that of gadolinium. Through these results, SFMO/Ag composite has some potential application for magnetic refrigerants in an extended high-temperature range.

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