The large cryogenic magnetocaloric effect of TbAl2 nanocapsules
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2022, Journal of Alloys and CompoundsCitation 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 TechnologyCitation 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.
The study of entropy change and magnetocaloric response in magnetic nanoparticles via heat capacity measurements
2018, International Journal of RefrigerationFacile preparation of carbon-coated Mg nanocapsules as light microwave absorber
2015, Materials LettersEnhanced 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 CompoundsCitation 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 InternationalCitation 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].