Invetsigation of magneto-volume effect of DyCo2 compoundunder isothermal and adiabatic mode of magnetic field change

AbstractThe positive magnetocaloric effect (MCE) in the vicinity of the Curie point in Ni2+xMn1-xGa (x=0.33, 0.36, 0.39) Heusler alloys and the negative and positive MCE near the metamagnetostructural (MMS) transition and the Curie point, respectively, in Ni45Co5Mn36.5In13.5 Heusler alloy has been measured by a direct method. For the magnetic field change ΔH = 2 T, the maximal adiabatic temperature change ΔTad at the Curie point in Ni2+xMn1-xGa alloys is larger than 0.6 K. For Ni45Co5Mn36.5In13.5 alloy, the maximal value of ΔTad = 1.68 K (for the same magnetic field change, ΔH = 2 T) is observed at the MMS phase transition temperature.

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Influence of magnetic field change on the magnetization relaxation of YBa2Cu3O7−δ superconductor

Solid State Communications ◽

10.1016/0038-1098(90)90975-h ◽

1990 ◽

Vol 76 (9) ◽

pp. 1111-1114 ◽

Cited By ~ 6

Author(s):

S.W. Hsu ◽

Y.C. Chen ◽

W.H. Lee

Keyword(s):

Magnetic Field ◽

Field Change ◽

Magnetization Relaxation ◽

Magnetic Field Change

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Magnetic Properties and Magnetocaloric Effect of Gd3Ni in Crystalline and Amorphous States

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.190.355 ◽

2012 ◽

Vol 190 ◽

pp. 355-358 ◽

Cited By ~ 2

Author(s):

D.A. Shishkin ◽

N.V. Baranov ◽

A.V. Proshkin ◽

S.V. Andreev ◽

A.S. Volegov

Keyword(s):

Magnetic Field ◽

Magnetocaloric Effect ◽

Entropy Change ◽

Rapid Quenching ◽

Antiferromagnetic Order ◽

Cooling Power ◽

Ferromagnetic Behavior ◽

Field Change ◽

Ni Alloy ◽

Magnetic Field Change

The liquid quenched Gd3Ni alloy is observed to exhibit a ferromagnetic behavior below TC = 117 K unlike crystalline compound having an antiferromagnetic order at T < TN = 99 K. Rapid quenching from the melt results in a considerable enhancement of the magnetocaloric effect in Gd3Ni at low magnetic fields. The maximal value of the isothermal magnetic entropy change at a magnetic field change of 20 kOe for the amorphous Gd3Ni surpasses by more than 8 times the SM value for the polycrystalline counterpart. The relative cooling power for the amorphous Gd3Ni alloy is estimated as 265 J kg-1 and 676 J kg-1 at a magnetic field change of 20 kOe and 50 kOe, respectively.

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The Magnetocaloric Effect in Ni-Mn-X (X=Ga, in) Heusler Alloys and Manganites with Magnetic Transition close to Room Temperature

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.168-169.165 ◽

2010 ◽

Vol 168-169 ◽

pp. 165-168

Author(s):

Vasiliy D. Buchelnikov ◽

Mikhail Drobosyuk ◽

E.A. Smyshlyaev ◽

O.O. Pavlukhina ◽

A.V. Andreevskikh ◽

...

Keyword(s):

Magnetic Field ◽

Magnetocaloric Effect ◽

Room Temperature ◽

Direct Method ◽

Magnetic Transition ◽

Heusler Alloys ◽

Field Change ◽

Adiabatic Temperature Change ◽

Magnetic Field Change ◽

The Magnetic Field

The magnetocaloric effect (MCE) in theNi2+xMn1-xGa (x = 0.33, 0.36, 0.39), Ni50Mn25In25, Ni54Mn21Ga18In7, Ni53.5Mn21.5Ga16In9, Ni45Co5Mn36.5In13.5 Heusler alloys and in the La0.7BayCa0.3-yMnO3 (y = 0.12, 0.24, 0.3) manganites at the Curie points have been measured by the direct method. For the magnetic field change H = 2 T, the maximal adiabatic temperature change Tad in the Ni2+xMn1-xGa alloys is larger than 0.6 K. For the Ni50Mn25In25 alloy the maximal value of Tad = 1.51 K (for the same magnetic field change H = 2 T) is observed at the magnetic phase transition temperature.

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The Research of Capacitance Characteristics of MRF

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.246-247.1096 ◽

2012 ◽

Vol 246-247 ◽

pp. 1096-1101

Author(s):

Song Wang ◽

Guo Tian He ◽

Li Song ◽

Ze Yu Xu ◽

Ying Chun Ran

Keyword(s):

Magnetic Field ◽

Dielectric Constant ◽

Electrical Characteristics ◽

Field Change ◽

Aircraft Manufacturing ◽

Magnetic Field Change ◽

Capacitance Characteristics ◽

Magneto Rheological ◽

Magnetic Induction Intensity ◽

The Magnetic Field

With the development of theory that research on Magneto-Rheological Fluids (MRF), the MRF have been used in many fields in our life. The electrical characteristics of MRF can be widely used in automatic control, medical, automotive, aircraft manufacturing and many other areas .Firstly, this article have derived the formula of MRF between capacitance and Dielectric constant, made the Capacitors which can load the MRF. And then we measure the change of capacitance which is filled with the MRF when the time of magnetic field change, And we also measure the sensitivity of the dielectric constant of different concentrations of MRF as the magnetic field changes. And at last, we have made the curve of the capacitance - magnetic induction intensity the experimental results have been analyzed. We have the conclusion that when the magnetic field increases, the dielectric constant is also increases, resulting in increased capacitance of the conclusions of MRF. Introduction

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