Second-Order Magnetic Transition and Low Field Magnetocaloric Effect in Nanocrystalline $$\hbox {Pr}_ {5}\hbox {Co}_{19}$$ Pr 5 Co 19 Compound

2018 ◽  
Vol 47 (5) ◽  
pp. 2776-2781 ◽  
Author(s):  
W. Bouzidi ◽  
N. Mliki ◽  
L. Bessais
Keyword(s):  
Magnetocaloric Effect ◽  
Magnetic Transition ◽  
Second Order ◽  
Low Field

Large Magnetization and Reversible Magnetocaloric Effect at the Second-Order Magnetic Transition in Heusler Materials

2016 ◽  
Vol 28 (17) ◽  
pp. 3321-3325 ◽  
Author(s):  
Sanjay Singh ◽  
Luana Caron ◽  
Sunil Wilfred D'Souza ◽  
Tina Fichtner ◽  
Giacomo Porcari ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Magnetic Transition ◽  
Second Order

Tunable magnetocaloric effect in La0.7Ca0.3MnO3 nanoparticles

2018 ◽  
Vol 32 (26) ◽  
pp. 1850290
Author(s):  
S. Qaseem ◽  
M. Naeem ◽  
S. Rizwan Ali
Keyword(s):  
Particle Size ◽  
Magnetocaloric Effect ◽  
Magnetic Transition ◽  
Second Order ◽  
Gradual Transition ◽  
Cooling Power ◽  
Zero Field ◽  
Colossal Magnetoresistive ◽  
Three Samples ◽  
Saturation Region

We study ferromagnetic to paramagnetic transition using Banerjee criterion in colossal magnetoresistive La[Formula: see text]Ca[Formula: see text]MnO3 nanoparticles of different sizes (20, 26 and 32 nm). These particles are chemically prepared by a modified citrate route. Particle sizes are estimated by X-ray diffraction (XRD). Sample morphology and size distribution are examined by a transmission electron microscope. Order of transition is determined by measuring magnetic field dependence of magnetization near Curie temperature T[Formula: see text]. Our results reveal second-order magnetic transition in all three different-sized particles in contrast to the first-order transition reported in bulk samples. This is further supported by temperature dependences of zero-field-cooled (ZFC) and field-cooled (FC) magnetizations. FC curves show gradual transition for all three samples without any saturation region as is the case of bulk. T[Formula: see text] is extracted from ZFC curves and is found to be 240 K for 20 nm particles and 258 K for both 26 and 32 nm particles. Magnetocaloric effect as a function of particle size also confirms the second-order magnetic transition in all three samples. The relative cooling power at 20 kOe is found to be decreasing with decreasing particle size.

Giant Magnetocaloric Effect of Tmcosi Compound Under Low Field Change

2020 ◽  
Author(s):  
Jia-Wang Xu ◽  
Xinqi Zheng ◽  
Shu-Xian Yang ◽  
L. Xi ◽  
J. Y. Zhang ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Field Change ◽  
Low Field ◽  
Giant Magnetocaloric Effect

Large low-field magnetocaloric effect in directionally solidified Ni 55 Mn 18+x Ga 27−x (x = 0, 1, 2) alloys

2018 ◽  
Vol 445 ◽  
pp. 71-76 ◽  
Author(s):  
Zhenzhuang Li ◽  
Zongbin Li ◽  
Bo Yang ◽  
Yiqiao Yang ◽  
Yudong Zhang ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Directionally Solidified ◽  
Low Field

scholarly journals The Effect of Different Atomic Substitution at Mn Site on Magnetocaloric Effect in Ni50Mn35Co2Sn13 Alloy

Crystals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 329 ◽  
Author(s):  
Chengfen Xing ◽  
Hu Zhang ◽  
Kewen Long ◽  
Yaning Xiao ◽  
Hanning Zhang ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Parent Phase ◽  
Martensitic Transition ◽  
Martensitic Transformation Temperature ◽  
Low Field ◽  
Transition Metal Element ◽  
Magnetocaloric Properties ◽  
Metal Element ◽  
Mn Content ◽  
Atomic Substitution

The effect of different atomic substitutions at Mn sites on the magnetic and magnetocaloric properties in Ni50Mn35Co2Sn13 alloy has been studied in detail. The substitution of Ni or Co for Mn atoms might lower the Mn content at Sn sites, which would reduce the d-d hybridization between Ni 3d eg states and the 3d states of excess Mn atoms at Sn sites, thus leading to the decrease of martensitic transformation temperature TM in Ni51Mn34Co2Sn13 and Ni50Mn34Co3Sn13 alloys. On the other hand, the substitution of Sn for Mn atoms in Ni50Mn34Co2Sn14 would enhance the p-d covalent hybridization between the main group element (Sn) and the transition metal element (Mn or Ni) due to the increase of Sn content, thus also reducing the TM by stabilizing the parent phase. Due to the reduction of TM, a magnetostructural martensitic transition from FM austenite to weak-magnetic martensite is realized in Ni51Mn34Co2Sn13 and Ni50Mn34Co2Sn14, resulting in a large magnetocaloric effect around room temperature. For a low field change of 3 T, the maximum ∆SM reaches as high as 30.9 J/kg K for Ni50Mn34Co2Sn14. A linear dependence of ΔSM upon μ0H has been found in Ni50Mn34Co2Sn14, and the origin of this linear relationship has been discussed by numerical analysis of Maxwell’s relation.

Giant and reversible low field magnetocaloric effect in LiHoF4 compound

2021 ◽  
Author(s):  
Huicai Xie ◽  
Lu Tian ◽  
Qi Chen ◽  
Hao Sun ◽  
Xinqiang Gao ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Industrial Production ◽  
High Efficiency ◽  
Human Life ◽  
Magnetic Refrigeration ◽  
Good Stability ◽  
Low Field ◽  
Application Potential

Cryogenic refrigeration technology is gradually penetrating into increasing aspects in human life and industrial production. Magnetic refrigeration shows excellent application potential due to its high efficiency, good stability and environmental...

scholarly journals Magnetic transition and magnetocaloric effect of Gd4Sb3-xRx (R=Si, Ge, Sn, 0 ≤ x ≤ 0.75) compounds

AIP Advances ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 035206 ◽  
Author(s):  
Shaohui Chen ◽  
Guiquan Yao ◽  
Jinsong Zhang ◽  
Xiaomeng Fan ◽  
Xiaowei Yin ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Magnetic Transition
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