Magnetic Phase Transition and Magnetic Proporties of LaFe11.6Si1.4Bx Compounds

2013 ◽  
Vol 750-752 ◽  
pp. 919-922
Author(s):  
Kun Xie ◽  
Yin Liu ◽  
Mei Qing Cao ◽  
Peng Cheng Xia ◽  
Li Jie Yue
Keyword(s):  
Phase Transition ◽  
Curie Temperature ◽  
Magnetic Phase Transition ◽  
Magnetic Entropy Change ◽  
Magnetic Phase ◽  
Magnetic Transition ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
First Order ◽  
Melt Spun

The magnetic phase transition and magnetic entropy change of melt-spun LaFe11.6Si1.4Bx(x=0.0, 0.3, 0.5, 0.7) ribbons were investigated by measuring the magnetization as the function of temperature. Comparing with LaFe11.6Si1.4, the NaZn13-type structure of LaFe11.6Si1.4Bxdid not change after introducing B atoms, while the amount of α-Fe phase in the ribbons significantly decreased. The Curie temperature slightly changes after the addition of B. The LaFe11.6Si1.4Bx(x=0.3, 0.5) exhibits first-order magnetic transition and large magnetic entropy change as observed in LaFe11.6Si1.4compound.

Magnetic phase transition and giant anisotropic magnetic entropy change in TbFeO3 single crystal

2016 ◽  
Vol 119 (6) ◽  
pp. 063904 ◽  
Author(s):  
Yiming Cao ◽  
Maolin Xiang ◽  
Weiyao Zhao ◽  
Guohua Wang ◽  
Zhenjie Feng ◽  
...  
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Magnetic Phase Transition ◽  
Magnetic Entropy Change ◽  
Magnetic Phase ◽  
Entropy Change ◽  
Magnetic Entropy

Magnetic entropy change and magnetic phase transition of LaFe 11.4 Al 1.6 C x ( x =0–0.8) compounds

2006 ◽  
Vol 15 (4) ◽  
pp. 845-849 ◽  
Author(s):  
Chen Jing ◽  
Zhang Hong-Wei ◽  
Zhang Li-Gang ◽  
Dong Qiao-Yan ◽  
Wang Ru-Wu
Keyword(s):  
Phase Transition ◽  
Magnetic Phase Transition ◽  
Magnetic Entropy Change ◽  
Magnetic Phase ◽  
Entropy Change ◽  
Magnetic Entropy

scholarly journals Study on the magnetic entropy change and magnetic phase transition of NaZn13-type LaFe13－xAlxCy compounds

2006 ◽  
Vol 55 (10) ◽  
pp. 5506
Author(s):  
Zhang Li-Gang ◽  
Chen Jing ◽  
Zhu Bo-Quan ◽  
Li Ya-Wei ◽  
Wang Ru-Wu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Phase Transition ◽  
Magnetic Entropy Change ◽  
Magnetic Phase ◽  
Entropy Change ◽  
Magnetic Entropy

Study of Magnetic Transition and Magnetocaloric Effect in La1-xSrxMnO3 (0.20≤ x ≤0.35) Compounds

2013 ◽  
Vol 378 ◽  
pp. 225-229 ◽  
Author(s):  
Yeong Seung Jeong ◽  
M.S. Anwar ◽  
Faheem Ahmed ◽  
Seung Rok Lee ◽  
Bon Heun Koo
Keyword(s):  
Curie Temperature ◽  
Magnetic Entropy Change ◽  
Perovskite Phase ◽  
Magnetic Transition ◽  
Entropy Change ◽  
Solid State Reaction Method ◽  
Magnetic Entropy ◽  
Conventional Solid State Reaction ◽  
Ionic Radii ◽  
The Difference

We report the magnetic transition and large magnetic entropy change in Sr doped lanthanum manganites. Polycrystalline La1-xSrxMnO3(0.20x0.35) samples were prepared using the conventional solid-state reaction method. The results of X-ray diffraction indicates perovskite phase without any impurity. The magnetic study has revealed that the Curie temperature is influenced by Sr-concentration. The doping of Sr at La site affects the Mn-O bond length and Mn-O-Mn bond angle due to the difference in their ionic radii, consequently, the Curie temperature changed. A large magnetic entropy change has been observed for La0.8Sr0.2MnO3sample, the value of the maximum entropy change (SMmax) increases from 1.42 to 2.74 J/kgK as magnetic field increases from 1 to 2.5 T. This investigation suggests that La1-xSrxMnO3can be used as a potential magnetic refrigeration material.

PHASE TRANSITIONS IN INSULATING VANADIUM OXIDE

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3338-3338 ◽  
Author(s):  
A. JOSHI ◽  
M. MA ◽  
F. C. ZHANG
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Magnetic Transition ◽  
Magnetic Ordering ◽  
Orbital Ordering ◽  
First Order ◽  
Bond Model ◽  
Orbital Phase

The magnetic phase transition from the paramagnetic to antiferromagnetic state in insulating V2O3 shows some very interesting features. Not only is the magnetic order ng pattern anomalous, but the magnetic transition shows other surprises: I) the magnetic and orbital ordering occur at the same transition temperature; II) the transition is strongly first order; III) above the transition temperature, neutron scattering observes features in wave vectors different from the ordering wave vector. We study this system using the recently proposed S = 2 bond model (Phys. Rev. Lett.85, 1714 (2000)) for insulating V2O3. We show that this model not only explains the anomalous magnetic ordering, but also resolves the other questions associated with the magnetic phase transition (Phys. Rev. Lett.86, 5743 (2001)). We further point out the possibility of changes in the phase transition phenomenology in presence of a magnetic field, and another orbital phase transition at lower temperatures.

scholarly journals The magnetic, magnetic entropy and critical behavior studies in La0.8Ba0.2MnO3 around magnetic phase transition temperature.

2020 ◽  
Author(s):  
Mazhar Iqbal ◽  
Muhammad Nasir Khan ◽  
Ayaz Arif Khan ◽  
Khurram Shahzad ◽  
Imran Zaka ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Phase Transition ◽  
Equations Of State ◽  
Magnetic Measurements ◽  
Magnetic Phase ◽  
Critical Phenomenon ◽  
Entropy Change ◽  
Rhombohedral Structure ◽  
Cooling Power ◽  
Magnetic Entropy

Abstract Magnetocaloric and critical phenomenon investigations were carried out in the crystalline La0.8Ba0.2MnO3 samples prepared through solid state reaction technique. X-ray diffraction (XRD) pattern and its Rietveld refinement using Rietica software confirmed the crystalline phase purity of rhombohedral structure with space group \(R\bar{3}c\). From magnetic measurements, the Ferromagnetic to paramagnetic (FM-PM) phase transition was observed at TC ~ 285K. The maximum change in magnetic entropy (\(Delta{S}^{max}_M\)) and relative cooling power (RCP) extracted from magnetic measurements were 3.02 J/kg K and 142.00 J/kg at an applied magnetic field (moH) of 4T. Griffiths phase (GP) with a susceptibility exponent λ = 0.44 was also detected in temperature range of TC < T < TG. Critical exponential analysis indicated the 3D-Ising model like magnetic phase transition at TC. Critical exponent’s reliability was confirmed using models such as universal scaling equations of state and Widom scaling relation. Magnetic entropy change follows the law ΔSM = (moH)n for n = 0.46.

Study of Magnetocaloric Properties of Ni-Mn-X (X = Ga, In) Heusler Alloys by Monte Carlo Technique

2009 ◽  
Vol 1200 ◽  
Author(s):  
Vasiliy Buchelnikov ◽  
Vladimir Sokolovskiy ◽  
Sergey Taskaev ◽  
Peter Entel
Keyword(s):  
Experimental Data ◽  
Phase Transition ◽  
Monte Carlo ◽  
Magnetic Entropy Change ◽  
Heusler Alloys ◽  
Entropy Change ◽  
Magnetic Contribution ◽  
Magnetic Entropy ◽  
First Order ◽  
Magnetocaloric Properties

AbstractTwo theoretical Monte Carlo models have been presented for description of the positive and negative magnetocaloric effects of Heusler Ni-Mn-X (X = Ga, In) alloys undergoing first order coupled magnetostructural phase transition. For both models all quantities such as temperature dependence of the magnetic contribution to the total specific heat, magnetization and isothermal magnetic entropy change are in qualitative agreement with the available experimental data.

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