Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33688
Title: Giant reversible magnetocaloric effect in flower-like β-Co(OH)2 hierarchical superstructures self-assembled by nanosheets
Authors: Liu, X
Feng, C
Xiao, F
Or, SW 
Sun, Y
Jin, C
Xia, A
Keywords: Magnetic materials
Nanocomposites
Nanoparticles
Issue Date: 2014
Publisher: Univ Fed Sao Carlos, Dept Engenharia Materials
Source: Materials research, 2014, v. 17, no. 1, p. 186-189 How to cite?
Journal: Materials research 
Abstract: A facile hydrothermal strategy is proposed to synthesize flower-like β-Co(OH)2 hierarchical microspherical superstructures with a diameter of 0.5-1.5 μm, which are self-assembled by β-Co(OH)2 nanosheets with the average thickness ranging between 20 and 40 nm. The magnetocaloric effect associated with magnetic phase transitions in Co(OH)2 superstructures has been investigated. A sign change in the magnetocaloric effect is induced by a magnetic field, which is related to a filed-induced transition from the antiferromagnetic to the ferromagnetic state below the Néel temperature. The large reversible magnetic-entropy change -ΔSm (13.4 J/kg K at 15 K for a field change of 5 T) indicates that flower-like Co(OH)2 superstructures is a potential candidate for application in magnetic refrigeration in the low-temperature range.
URI: http://hdl.handle.net/10397/33688
ISSN: 1516-1439
EISSN: 1980-5373
DOI: 10.1590/S1516-14392013005000171
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