Microstructure and magnetic properties of graphite-coated Gd nanocapsules

X. G. Liu; D. Y. Geng; Q. Zhang; J. J. Jiang; W. Liu; Z. D. Zhang

doi:10.1063/1.3100618

Microstructure and magnetic properties of graphite-coated Gd nanocapsules

X. G. Liu, D. Y. Geng, Q. Zhang, J. J. Jiang, W. Liu, Z. D. Zhang

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Gd nanocapsules, which are stable in air with the protection of graphite shells, are prepared by a modified arc-discharge technique. A size-induced structural transformation from the hexagonal-close-packed (hcp) to the higher-symmetry face-centered-cubic structure is observed. The graphite-coated hcp-Gd nanocapsules display a blocked state below 35 K, superparamagnetism between 35 and 290 K, and typical paramagnetism above 290 K. The hcp-Gd nanocapsules have a magnetic-entropy change -Δ S_m of 48.8 J kg^-1 K^-1 at 6 K for an applied-field change from 1 to 7 T.

Original language	English
Article number	103104
Journal	Applied Physics Letters
Volume	94
Issue number	10
DOIs	https://doi.org/10.1063/1.3100618
State	Published - 2009
Externally published	Yes

Funding

This work was supported by National Natural Science Foundation of China under Grant Nos. 50331030 and 50831006.

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10.1063/1.3100618

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title = "Microstructure and magnetic properties of graphite-coated Gd nanocapsules",

abstract = "Gd nanocapsules, which are stable in air with the protection of graphite shells, are prepared by a modified arc-discharge technique. A size-induced structural transformation from the hexagonal-close-packed (hcp) to the higher-symmetry face-centered-cubic structure is observed. The graphite-coated hcp-Gd nanocapsules display a blocked state below 35 K, superparamagnetism between 35 and 290 K, and typical paramagnetism above 290 K. The hcp-Gd nanocapsules have a magnetic-entropy change -Δ Sm of 48.8 J kg-1 K-1 at 6 K for an applied-field change from 1 to 7 T.",

author = "Liu, {X. G.} and Geng, {D. Y.} and Q. Zhang and Jiang, {J. J.} and W. Liu and Zhang, {Z. D.}",

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AU - Liu, X. G.

AU - Geng, D. Y.

AU - Zhang, Q.

AU - Jiang, J. J.

AU - Liu, W.

AU - Zhang, Z. D.

PY - 2009

Y1 - 2009

N2 - Gd nanocapsules, which are stable in air with the protection of graphite shells, are prepared by a modified arc-discharge technique. A size-induced structural transformation from the hexagonal-close-packed (hcp) to the higher-symmetry face-centered-cubic structure is observed. The graphite-coated hcp-Gd nanocapsules display a blocked state below 35 K, superparamagnetism between 35 and 290 K, and typical paramagnetism above 290 K. The hcp-Gd nanocapsules have a magnetic-entropy change -Δ Sm of 48.8 J kg-1 K-1 at 6 K for an applied-field change from 1 to 7 T.

AB - Gd nanocapsules, which are stable in air with the protection of graphite shells, are prepared by a modified arc-discharge technique. A size-induced structural transformation from the hexagonal-close-packed (hcp) to the higher-symmetry face-centered-cubic structure is observed. The graphite-coated hcp-Gd nanocapsules display a blocked state below 35 K, superparamagnetism between 35 and 290 K, and typical paramagnetism above 290 K. The hcp-Gd nanocapsules have a magnetic-entropy change -Δ Sm of 48.8 J kg-1 K-1 at 6 K for an applied-field change from 1 to 7 T.

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 10

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ER -

Microstructure and magnetic properties of graphite-coated Gd nanocapsules

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