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Your search keyword '"Pedro Baptista de Castro"' showing total 2 results
Start Over Author "Pedro Baptista de Castro" Journal science and technology of advanced materials
2 results on '"Pedro Baptista de Castro"'

1. Effect of Dy substitution in the giant magnetocaloric properties of HoB2

Author

Pedro Baptista de Castro, Kensei Terashima, Takafumi D. Yamamoto, Suguru Iwasaki, Ryo Matsumoto, Shintaro Adachi, Yoshito Saito, Hiroyuki Takeya, and Yoshihiko Takano

Subjects
magnetic refrigeration, magnetocaloric effect, adiabatic temperature change, Materials of engineering and construction. Mechanics of materials, TA401-492, Biotechnology, TP248.13-248.65
Abstract

Recently, a massive magnetocaloric effect near the liquefaction temperature of hydrogen has been reported in the ferromagnetic material HoB2. Here we investigate the effects of Dy substitution in the magnetocaloric properties of Ho1-xDyxB2 alloys (x = 0, 0.3, 0.5, 0.7, 1.0). We find that the Curie temperature (TC) gradually increases upon Dy substitution, while the magnitude of the magnetic entropy change |ΔSM| and adiabatic temperature change ΔTad showed a gradual decrease. On the other hand, due to the presence of successive transitions in these alloys, the peak height of the above magnetocaloric properties tends to be kept in a wide temperature range, leading to a relatively robust figure of merit in a wide temperature span. These alloys could be interesting candidates for magnetic refrigeration in the temperature range of 10–60 K.

Published
2020
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2. Effect of Dy substitution in the giant magnetocaloric properties of HoB2

Author

Hiroyuki Takeya, Ryo Matsumoto, Takafumi Yamamoto, Kensei Terashima, Pedro Baptista de Castro, Yoshihiko Takano, Yoshito Saito, Suguru Iwasaki, and Shintaro Adachi

Subjects
magnetocaloric effect, Materials science, Hydrogen, FOS: Physical sciences, chemistry.chemical_element, Thermodynamics, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Energy Materials, Condensed Matter::Materials Science, Magnetocaloric Materials, Magnetic refrigeration, General Materials Science, Materials of engineering and construction. Mechanics of materials, Condensed Matter - Materials Science, Substitution (logic), Materials Science (cond-mat.mtrl-sci), Liquefaction, adiabatic temperature change, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, Ferromagnetism, TA401-492, 0210 nano-technology, 203 Magnetics / Spintronics / Superconductors, TP248.13-248.65, Biotechnology, Research Article
Abstract

Recently, a massive magnetocaloric effect near the liquefaction temperature of hydrogen has been reported in the ferromagnetic material HoB$_{2}$. Here we investigate the effects of Dy substitution in the magnetocaloric properties of Ho$_{1-x}$Dy$_{x}$B$_{2}$ alloys ($\textit{x}$ = 0, 0.3, 0.5, 0.7, 1.0). We find that the Curie temperature ($\textit{T}$$_{C}$) gradually increases upon Dy substitution, while the magnitude of the magnetic entropy change |$\Delta \textit{S}_{M}$| at $\textit{T}$ = $\textit{T}_{C}$ decreases from 0.35 to 0.15 J cm$^{-3}$ K$^{-1}$ for a field change of 5 T. Due to the presence of two magnetic transitions in these alloys, despite the change in the peak magnitude of |$\Delta \textit{S}_{M}$|, the refrigerant capacity ($\textit{RC}$) and refrigerant cooling power ($\textit{RCP}$) remains almost constant in all doping range, which as large as 5.5 J cm$^{-3}$ and 7.0 J cm$^{-3}$ for a field change of 5 T. These results imply that this series of alloys could be an exciting candidate for magnetic refrigeration in the temperature range between 10-50 K., Comment: 19 pages, 5 figures, 2 tables

Published
2020
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