Research of magnetocaloric effect of Ni-Mn-In-Co- based Heusler alloys by the direct method in magnetic fields up to 14 T

The specific heat and magnetocaloric effect of the LaFe11.2-хMnxCo0.7Si1.1 intermetallic compounds (x = 0.1, 0.2, 0.3) were measured in the temperature range 80–300 K and in magnetic fields up to 8 T. The magnetocaloric effect (MCE) was estimated using two methods: direct method in cyclic magnetic fields, as well as an indirect method from heat capacity data. It was shown that an increase in the concentration of Mn atoms leads to a shift in the Curie temperature of the TC toward lower temperatures, while the FM value changes slightly.

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Magnetocaloric Effect in Ni-Mn-Ga and Ni-Co-Mn-In Heusler Alloys

MRS Proceedings ◽

10.1557/proc-1200-g07-03 ◽

2009 ◽

Vol 1200 ◽

Cited By ~ 1

Author(s):

Vasiliy Buchelnikov ◽

Sergey Taskaev ◽

Mikhail Drobosyuk ◽

Vladimir Sokolovskiy ◽

Viktor Koledov ◽

...

Keyword(s):

Magnetic Field ◽

Magnetocaloric Effect ◽

Curie Point ◽

Direct Method ◽

Heusler Alloys ◽

Field Change ◽

Adiabatic Temperature Change ◽

Magnetic Field Change ◽

A Direct Method ◽

The Magnetic Field

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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Experimental Study of Magnetocaloric Effect in Ni-Fe-Mn-Ga and Ni-Co-Mn-Ga Heusler Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.738-739.456 ◽

2013 ◽

Vol 738-739 ◽

pp. 456-460 ◽

Cited By ~ 4

Author(s):

Rafael Fayzullin ◽

Vasiliy D. Buchelnikov ◽

Sergey Taskaev ◽

Mikhail Drobosyuk ◽

Vladimir V. Khovaylo

Keyword(s):

Martensitic Transformation ◽

Curie Temperature ◽

Magnetocaloric Effect ◽

Temperature Increase ◽

Direct Method ◽

Heusler Alloys ◽

Iron Concentration ◽

Magnetostructural Transition ◽

Phase Transition Temperatures ◽

Magnetic Field Change

In this work we experimentally studied the MCE in the Heusler alloys Ni2.19-xFexMn0.81Ga (x = 0.01, 0.02, 0.03, 0.04) and Ni2.16-xCoxMn0.84Ga (x = 0.03, 0.06, 0.09). Magnetocaloric effect was measured by the direct method using the installation from the company AMT&C. The temperature dependencies of ∆Tad for the magnetic field change ∆H = 2 T were measured. The phase transition temperatures were determined from temperature dependencies of low field magnetization measured by original setup using Hall effect. Studies have shown that replacement of the Ni atoms with the iron atoms slightly reduces the temperature magnetostructural transition for x = 0.01,0.02, and starting with x = 0.03, magnetic and structural transitions occur separately and a further increase in iron concentration leads to the Curie temperature increase, while the temperature martensitic transformation decreases. When replacing the Ni atoms with the Co atoms of the martensitic transformation temperature and Curie temperature increase.

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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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