Large adiabatic temperature change in magnetoelastic transition in Ni50Mn35Cr2Sn13 Heusler alloy of granular nanostructure

2016 ◽  
Author(s):  
H. R. Prakash ◽  
S. K. Sharma ◽  
S. Ram ◽  
S. Chatterjee
Keyword(s):  
Temperature Change ◽  
Heusler Alloy ◽  
Adiabatic Temperature ◽  
Adiabatic Temperature Change

Simple Set-Up for Adiabatic Measurements of Magnetocaloric Effect

2015 ◽  
Vol 644 ◽  
pp. 215-218 ◽  
Author(s):  
P. Álvarez-Alonso ◽  
J. López-García ◽  
G. Daniel-Perez ◽  
D. Salazar ◽  
P. Lázpita ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetocaloric Effect ◽  
Temperature Change ◽  
Heusler Alloy ◽  
Cost Effective ◽  
Adiabatic Temperature ◽  
Magnetic Phase Transitions ◽  
Adiabatic Temperature Change ◽  
Set Up ◽  
The Magnetic Field

We present a cost-effective and robust set-up designed to measure directly the magnetic field-induced adiabatic temperature change. The system uses a piston to introduce/remove the sample to/from the magnetic field (μ0∆His up to 1.7T) created by an ordinary electromagnet. The temperature of the sample is controlled by a double pipe heat exchanger operating by the electrical heater and air flow circulation from a Dewar with liquid nitrogen to the sample holder assembly.We have measured the adiabatic temperature change, ΔTad, of two polycrystalline samples: Gd and Ni50Mn35In15Heusler alloy. At the second-order magnetic phase transitions (18oC for Gd and 42oC for Ni50Mn35In15), ΔTadunder μ0∆H=1.7T are 3.8±0.1oC for Gd and 1.9±0.1oC for Ni50Mn35In15. The Heusler alloy shows an inverse magnetocaloric effect: ΔTadis-1.5±0.1oC on cooling and-1.6±0.1oC on heating at the martensitic transformation temperatures of ~24oC and ~29oC, respectively.

Large electrocaloric response with superior temperature stability in NaNbO3-based relaxor ferroelectrics benefiting from crossover region

2020 ◽  
Author(s):  
Ling Zhang ◽  
Chunlin Zhao ◽  
Ting Zheng ◽  
Jiagang Wu
Keyword(s):  
Temperature Change ◽  
Temperature Stability ◽  
Relaxor Ferroelectrics ◽  
Adiabatic Temperature ◽  
Next Generation ◽  
Crossover Region ◽  
Adiabatic Temperature Change

Electrocaloric refrigeration emerges as a newly-developing technology with potential to be the next generation of coolers. However, the combination of large adiabatic temperature change (ΔT) and good temperature stability remains...

scholarly journals Tunable Magnetocaloric Properties of Gd-Based Alloys by Adding Tb and Doping Fe Elements

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2877 ◽  
Author(s):  
Lingfeng Xu ◽  
Chengyuan Qian ◽  
Yongchang Ai ◽  
Tong Su ◽  
Xueling Hou
Keyword(s):  
Magnetic Field ◽  
Curie Temperature ◽  
Temperature Change ◽  
Indirect Measurement ◽  
Adiabatic Temperature ◽  
Doping Content ◽  
Adiabatic Temperature Change ◽  
Magnetocaloric Properties ◽  
Capacity Calculation ◽  
Low Magnetic Field

In this paper, the magnetocaloric properties of Gd1−xTbx alloys were studied and the optimum composition was determined to be Gd0.73Tb0.27. On the basis of Gd0.73Tb0.27, the influence of different Fe-doping content was discussed and the effect of heat treatment was also investigated. The adiabatic temperature change (ΔTad) obtained by the direct measurement method (under a low magnetic field of 1.2 T) and specific heat capacity calculation method (indirect measurement) was used to characterize the magnetocaloric properties of Gd1−xTbx (x = 0~0.4) and (Gd0.73Tb0.27)1−yFey (y = 0~0.15), and the isothermal magnetic entropy (ΔSM) was also used as a reference parameter for evaluating the magnetocaloric properties of samples together with ΔTad. In Gd1−xTbx alloys, the Curie temperature (Tc) decreased from 293 K (x = 0) to 257 K (x = 0.4) with increasing Tb content, and the Gd0.73Tb0.27 alloy obtained the best adiabatic temperature change, which was ~3.5 K in a magnetic field up to 1.2 T (Tc = 276 K). When the doping content of Fe increased from y = 0 to y = 0.15, the Tc of (Gd0.73Tb0.27)1−yFey (y = 0~0.15) alloys increased significantly from 276 K (y = 0) to 281 K (y = 0.15), and a good magnetocaloric effect was maintained. The annealing of alloys (Gd0.73Tb0.27)1−yFey (y = 0~0.15) at 1073 K for 10 h resulted in an average increase of 0.3 K in the maximum adiabatic temperature change and a slight increase in Tc. This study is of great significance for the study of magnetic refrigeration materials with adjustable Curie temperature in a low magnetic field.

scholarly journals Dynamics of the magnetoelastic phase transition and adiabatic temperature change in Mn1.3Fe0.7P0.5Si0.55

2019 ◽  
Vol 477 ◽  
pp. 287-291 ◽  
Author(s):  
M. Fries ◽  
T. Gottschall ◽  
F. Scheibel ◽  
L. Pfeuffer ◽  
K.P. Skokov ◽  
...  
Keyword(s):  
Phase Transition ◽  
Temperature Change ◽  
Adiabatic Temperature ◽  
Adiabatic Temperature Change

Reversibility in the adiabatic temperature-change of Pr0.73Pb0.27MnO3

2013 ◽  
Vol 565 ◽  
pp. 139-143 ◽  
Author(s):  
Selda Kılıç Çetin ◽  
Mehmet Acet ◽  
Ahmet Ekicibil ◽  
Cengiz Sarıkürkçü ◽  
Kerim Kıymaç
Keyword(s):  
Temperature Change ◽  
Adiabatic Temperature ◽  
Adiabatic Temperature Change

Electrocaloric and electrostrictive effect of polar P(VDF–TrFE–CFE) terpolymers

2013 ◽  
Vol 03 (02) ◽  
pp. 1350015 ◽  
Author(s):  
Sheng-Guo Lu ◽  
Hui Xiong ◽  
Aixiang Wei ◽  
Xinyu Li ◽  
Qiming Zhang
Keyword(s):  
Electric Field ◽  
Temperature Change ◽  
Vinylidene Fluoride ◽  
Dielectric Material ◽  
Entropy Change ◽  
Adiabatic Temperature ◽  
Adiabatic Temperature Change ◽  
Poly Vinylidene Fluoride ◽  
Electrostrictive Effect ◽  
Rigid Ion Model

The electrocaloric effect (ECE) is the adiabatic temperature change or isothermal entropy change caused by the polarization change of a dielectric material when subjected to a change of external electric field. The electrostrictive effect is a form of elastic deformation of a dielectric induced by an electric field, associated with those components of strain which are independent of reversal field direction. It was found that both the ECE, e.g., adiabatic temperature change, and the electrostrictive strain in poly(vinylidene fluoride–trifluoroethylene–chlorofluoroethylene) (P(VDF–TrFE–CFE)) terpolymers are proportional to the square of the electric field. The adiabatic temperature change ΔT of ECE versus electric field can be illustrated using a modified Belov–Goryaga equation. ΔT is proportional to E2 when E is small. For electrostrictive effect, the rigid-ion model assumes that the anharmonic movement of the ions leads to the quadratic strain–electric field relation. The quotient of electrostrictive coefficient Q over the phenomenological coefficient β is empirically a constant, indicating that the larger the electrostrictive coefficient, the larger the ECE, which opens a new way to find out new electrocaloric materials.

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