Direct Measurements of Magnetocaloric Effect in a Single Crystalline Ni2.13Mn0.81Ga1.06 Heusler Alloy

Magnetocaloric effect (MCE) in the vicinity of first order martensitic transformation and second order magnetic transition in a single crystalline Ni2.13Mn0.81Ga1.06 Heusler compound was studied by a direct method. The obtained results revealed that, for the applied magnetic field strength μ0H = 1.9 T, MCE is irreversible in the vicinity of the first order martensitic transformation only when the MCE measurements are performed under cooling protocol. Plot of the experimentally measured adiabatic temperature change ΔTad as a function of temperature T indicated that ΔTad has a negligible benefit from the magnetic field-induced conversion of the high-temperature austenitic phase into the low-temperature martensitic phase and is mainly determined by the paraprocess of the austenitic phase around both direct and reverse martensitic transformations.

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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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Martensitic Transformation, Diffusional one and First-order Magnetic Transition under Extreme Conditions (High magnetic field, High pressure) and Their Interpretation from Electronic State

Materia Japan ◽

10.2320/materia.57.209 ◽

2018 ◽

Vol 57 (5) ◽

pp. 209-215

Author(s):

Tomoyuki Kakeshita

Keyword(s):

Magnetic Field ◽

High Pressure ◽

Martensitic Transformation ◽

Electronic State ◽

High Magnetic Field ◽

Magnetic Transition ◽

Extreme Conditions ◽

First Order

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An Interpretation on Kinetics of Martensitic Transformation

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.172-174.90 ◽

2011 ◽

Vol 172-174 ◽

pp. 90-98 ◽

Cited By ~ 1

Author(s):

Tomoyuki Kakeshita ◽

Takashi Fukuda ◽

Yong-Hee Lee

Keyword(s):

Magnetic Field ◽

Hydrostatic Pressure ◽

Martensitic Transformation ◽

Magnetic Fields ◽

Martensitic Transformations ◽

Phenomenological Theory ◽

Time Dependent ◽

Isothermal Process ◽

Kinetics Of ◽

Transformation Processes

We have investigated athermal and isothermal martensitic transformations (typical displacive transformations) in Fe–Ni, Fe–Ni–Cr, and Ni-Co-Mn-In alloys under magnetic fields and hydrostatic pressures in order to understand the time-dependent nature of martensitic transformation, that is, the kinetics of martensitic transformation. We have confirmed that the two transformation processes are closely related to each other, that is, the athermal process changes to the isothermal process and the isothermal process changes to the athermal one under a hydrostatic pressure or a magnetic field. These findings can be explained by the phenomenological theory, which gives a unified explanation for the two transformation processes previously proposed by our group.

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Direct measurements of magnetocaloric effect in the first-order system LaFe11.7Si1.3

Journal of Applied Physics ◽

10.1063/1.1563036 ◽

2003 ◽

Vol 93 (9) ◽

pp. 5503-5506 ◽

Cited By ~ 68

Author(s):

F. X. Hu ◽

Max Ilyn ◽

A. M. Tishin ◽

J. R. Sun ◽

G. J. Wang ◽

...

Keyword(s):

Magnetocaloric Effect ◽

Order System ◽

First Order ◽

Direct Measurements

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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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Magnetic-field-induced metamagnetic reverse martensitic transformation and magnetocaloric effect in all-d-metal Ni36.0Co14.0Mn35.7Ti14.3 alloy ribbons

Intermetallics ◽

10.1016/j.intermet.2019.106472 ◽

2019 ◽

Vol 110 ◽

pp. 106472 ◽

Cited By ~ 14

Author(s):

Kai Liu ◽

Xingqi Han ◽

Kun Yu ◽

Chicheng Ma ◽

Zhishuo Zhang ◽

...

Keyword(s):

Magnetic Field ◽

Martensitic Transformation ◽

Magnetocaloric Effect ◽

Reverse Martensitic Transformation

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Magnetic Phase Transitions and Magnetocaloric Effect in R2Fe17 (R = Y, Tb, Er)

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.233-234.204 ◽

2015 ◽

Vol 233-234 ◽

pp. 204-207 ◽

Cited By ~ 1

Author(s):

S.A. Nikitin ◽

I.A. Ovchenkova ◽

Georgiy A. Tskhadadze ◽

Konstantin P. Skokov

Keyword(s):

Transition Temperature ◽

Magnetocaloric Effect ◽

Magnetic Phase ◽

Magnetic Transition ◽

Exchange Interactions ◽

Thermodynamic Theory ◽

Magnetic Phase Transitions ◽

Magnetic Transition Temperature ◽

Local Fluctuations ◽

Direct Measurements

The direct measurements of the magnetocaloric effect (MCE) and the magnetization for R2Fe17 (R = Y, Tb, Dy) compounds are reported. The maximal values of the MCE for different R2Fe17 compounds are almost the same at the Curie temperature and are equal to 0.8 – 0.85 K at ΛH = 13.5 kOe. The field dependencies of the magnetization and MCE and the dependence of MCE via magnetization deviates from the classical regularities and describes by the thermodynamic theory attracting the higher terms. Obviously the occurrence of the mixed exchange interactions in these compounds leads to the requirement of consideration both thermal and local fluctuations of the exchange integrals near the magnetic 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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