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Large reversible entropy change at the inverse magnetocaloric effect in Ni-Co-Mn-Ga-In magnetic shape memory alloys
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10.1063/1.4808340
/content/aip/journal/jap/113/21/10.1063/1.4808340
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/21/10.1063/1.4808340

Figures

Image of FIG. 1.
FIG. 1.

X-ray diffraction patterns taken in the martensitic phase for (a) sample In3 and (b) sample In2. The peaks labelled with a subscript M correspond to the tetragonal martensite and those labelled with a subscript A correspond to the residual cubic phase.

Image of FIG. 2.
FIG. 2.

Differential scanning calorimetry (a) and (c) and magnetic susceptibility (b) and (d) curves for the two studied samples.

Image of FIG. 3.
FIG. 3.

Calorimetric curves recorded on cooling (top panels) and heating (lower panels) runs at selected values of the magnetic field.

Image of FIG. 4.
FIG. 4.

Left panels (a) and (b): Transition entropy change as a function of magnetic field. Blue squares correspond to cooling runs and red circles, to heating runs. Right panels (c) and (d): Transition temperature for the forward (blue squares) and reverse (red circles) transitions as a function of magnetic field. Lines correspond to linear fits to the data.

Image of FIG. 5.
FIG. 5.

Transformed fraction as a function of temperature for selected values of the magnetic field.

Image of FIG. 6.
FIG. 6.

Average transition enthalpy change (circles) and dissipated energy (triangles) as a function of magnetic field. Solid symbols stand for sample In3 and open symbols stand for sample In2. The inset shows an enlarged view for the dissipated energy.

Image of FIG. 7.
FIG. 7.

Magnetic field induced entropy change (magnetocaloric effect) as a function of temperature for selected values of the magnetic field (1, 2, 4 and 6 T). Continuous lines correspond to data from isofield measurements and solid symbols, to data from isothermal measurements (dashed lines are guides to the eye). The inset shows the maximum magnetocaloric value as a function of magnetic field.

Image of FIG. 8.
FIG. 8.

Magnetic field induced entropy change (magnetocaloric effect) as a function of temperature for selected values of the magnetic field (1, 2, 3, 4, 5, and 6 T). Continuous lines correspond to data from isofield measurements and solid symbols, to data from isothermal measurements. The inset shows the maximum magnetocaloric value as a function of magnetic field.

Image of FIG. 9.
FIG. 9.

Schematics of the protocols followed for isothermal measurements under application (left panel, protocol 1) and removal (right panel, protocol 2) of a magnetic field.

Image of FIG. 10.
FIG. 10.

Calorimetric curves as a function of time corresponding to cycling the magnetic field between zero and 6 T. Curves have been arbitrarily shifted along the axes for a better display.

Image of FIG. 11.
FIG. 11.

Magnetic field iduced entropy change, upon application and removal of a 6 T magnetic field. Black solid stars correspond to the first application, and red solid stars, to first removal of the field. Circles correspond to data for the successive field cycling. Lines are guides to the eye.

Image of FIG. 12.
FIG. 12.

Magnetic field iduced entropy change, upon application and removal of a 6 T magnetic field. Black solid stars correspond to the first application and red solid stars, to first removal of the field. Circles correspond to data for the successive field cycling. Lines are guides to the eye.

Image of FIG. 13.
FIG. 13.

Transformed fraction as a function of temperature for 0 (continuous blue lines) and 6 T (dashed red lines) magnetic field. Green vertical lines bound the region where reversible values for the entropy change are found. The vertical black solid line separates the zone where reversible entropy values coincide with those on the first application of the field (left side) from that where the reversible entropy values coincide with those on the first removal of the field (right side).

Tables

Generic image for table
Table I.

Curie temperature (), forward () and reverse () martensitic temperatures, thermal hysteresis ( ), transition entropy change ( ) at zero and at 6 T, magnetic field shift in the martensitic transition temperatures ( ), maximum field induced entropy change ( ), and maximum reversible field induced entropy change ( ). Values separated by commas correspond to the forward (left value) and reverse (right value) martensitic transition.

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/content/aip/journal/jap/113/21/10.1063/1.4808340
2013-06-04
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Large reversible entropy change at the inverse magnetocaloric effect in Ni-Co-Mn-Ga-In magnetic shape memory alloys
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/21/10.1063/1.4808340
10.1063/1.4808340
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