Elsevier

Scripta Materialia

Volume 59, Issue 3, August 2008, Pages 340-343
Scripta Materialia

The large cryogenic magnetocaloric effect of TbAl2 nanocapsules

https://doi.org/10.1016/j.scriptamat.2008.04.005Get rights and content

TbAl2 nanocapsules with a core of TbAl2 compound and a shell of amorphous Al2O3 were synthesized by the arc-discharge technique using modified strategies. The TbAl2 nanocapsules display superparamagnetic properties between the blocking temperature of 70 K and the Curie temperature of 100 K. The absolute value of the change of magnetic entropy of the TbAl2 nanocapsules rapidly increases with decreasing temperature, reaching 23.83 J kg−1 K−1 at 7.5 K with a magnetic field change of 70 kOe.

References (15)

  • Z.D. Zhang

    Nanocapsules

  • Z.D. Zhang

    J. Mater. Sci. Technol.

    (2007)
  • R.D. McMichael et al.

    J. Magn. Magn. Mater.

    (1992)
  • R.S. Ruoff et al.

    Science

    (1993)
  • Y. Liu et al.

    Nanotechnology

    (2004)
  • X.C. Sun et al.

    Nano. Lett.

    (2002)
  • S. Ma et al.

    J. Appl. Phys.

    (2005)
There are more references available in the full text version of this article.

Cited by (25)

  • Size-dependent magnetocaloric effect in GdVO<inf>4</inf> nanoparticles

    2022, Journal of Alloys and Compounds
    Citation Excerpt :

    It is indicated that the change of their magnetocaloric effect is closely related to the size-controlled magnetic properties of the material [8,22–24]. According to previous studies, the magnitude of the MCE in magnetic oxide nanoparticles is affected by two important magnetic factors: atomic moments and anisotropy barrier [25,26]. McMichael et al. predicted that nanomagnets would have large MCE because of their group atomic moments in a single magnetic particle (which means larger atomic moments) [11].

  • A new scale for optimized cryogenic magnetocaloric effect in ErAl<inf>2</inf>@Al<inf>2</inf>O<inf>3</inf> nanocapsules

    2018, Journal of Materials Science and Technology
    Citation Excerpt :

    According to previous studies, the magnitude of −ΔSM was affected by atomic moments and anisotropy barrier, but only monotonously increasing the atomic moments or decreasing the anisotropy barrier is difficult to get optimized −ΔSM. For example, the HoAl2 has a larger atomic moment of 10.7 μB than other RAl2 system (R = Gd, Tb, Dy) [29,30], but its −ΔSM only reach 8.5 J/(kg K) under 70 kOe at 5 K, which is lower than the corresponding −ΔSM of other RAl2 system under the same magnetic field and temperature [27,30]. It suggests that the optimized −ΔSM is decided by a complex combination of the magnetic parameters for different superparamagnetic systems.

  • Enhanced rate capability and cycling stability of core/shell structured CoFe<inf>2</inf>O<inf>4</inf>/onion-like C nanocapsules for lithium-ion battery anodes

    2015, Journal of Alloys and Compounds
    Citation Excerpt :

    The formation procedure of the CoFe2O4/OLC nanocapsules is schematically illustrated in Fig. 4, which includes the four stages: the evaporating process of Fe and Co atoms (stage I), the condensation of CoFe solid solution nanoparticles (stage II), the formation process of CoFe/OLC nanocapsules (stage III) and the air-annealing process (stage IV). For an evaporating pressure of 1.33 × 10−3 Pa (10−5 Torr), the corresponding evaporating temperatures are 1127 °C for Fe and 1157 °C for Co, which can determine the evaporating priority [33]. In the evaporation process (stage I), Co and Fe atoms evaporate simultaneously and then bump into each other between Co and Fe atoms.

  • Synthesis and electromagnetic properties of Fe<inf>3</inf>S<inf>4</inf> nanoparticles

    2014, Ceramics International
    Citation Excerpt :

    Due to expanded electromagnetic (EM) pollutions, development of effective EM wave absorption materials with strong absorption, wide frequency range, and thin thickness have been driving considerable theoretical and experimental investigations [1–7].

View all citing articles on Scopus
View full text