Papers by 13. Nguyen Huu Duc
Journal of the Korean Physical Society, 2013
Fe90−xNixZr10 (x = 0, 5, 10, 15, 20 and 25) ribbons with various thicknesses were prepared by usi... more Fe90−xNixZr10 (x = 0, 5, 10, 15, 20 and 25) ribbons with various thicknesses were prepared by using a melt-spinning technique. The Curie temperature, TC , of the alloys dramatically decreased from ∼960 K to room temperature at high quenching rates. When the alloys had an amorphous structure, their TC strongly depended on the Ni concentration. The maximum entropy change, |∆Sm|max, with ∆H = 12 kOe, of the alloys was around 1 J•kg −1 K −1 at room temperature. On the other hand, the full width at half maximum the entropy-change peak was quite large, ∼ 85 K, which was suitable for applications in magnetic refrigerators at room temperature.
Journal of Magnetism and Magnetic Materials, 2002
Magnetisation isotherms were measured for a number of (R; R 0)Co 2 and (R, Y)Co 2 (R, R 0 =rare e... more Magnetisation isotherms were measured for a number of (R; R 0)Co 2 and (R, Y)Co 2 (R, R 0 =rare earths) compounds. A metamagnetic transition is observed just above the Curie temperature (T C) of compounds having a first-order phase transition, i.e. ErCo 2 , HoCo 2 and (Dy, Y)Co 2. The magnetic entropy change DS m shows a largest value of À11.8 J/ mol K at 35 K for ErCo 2 and it decreases exponentially with increasing temperature. The obtained thermal variation of DS m is compared to that of RAl 2 and other intermetallic compounds. Giant magnetocaloric effects observed in RCo 2based compounds are discussed in terms of the 4f(R)-localised spin, 3d(Co)-spin fluctuations as well as nature of the phase transition.
Mémoires de la Société mathématique de France, 1981
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Papers by 13. Nguyen Huu Duc