Giant reversible magnetocaloric effect in flower-like β-Co(OH) 2 hierarchical superstructures self-assembled by nanosheets

Xianguo Liu; Chao Feng; Feng Xiao; Siu Wing Or; Yuping Sun; Chuangui Jin; Ailin Xia

doi:10.1590/S1516-14392013005000171

Giant reversible magnetocaloric effect in flower-like β-Co(OH) ₂ hierarchical superstructures self-assembled by nanosheets

Xianguo Liu
, Chao Feng
, Feng Xiao
, Siu Wing Or
, Yuping Sun
, Chuangui Jin
, Ailin Xia

The Hong Kong Polytechnic University

Research output: Journal article publication › Journal article › Academic research › peer-review

10 Citations (Scopus)

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 -δS_m (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.

Original language	English
Pages (from-to)	186-189
Number of pages	4
Journal	Materials Research
Volume	17
Issue number	1
DOIs	https://doi.org/10.1590/S1516-14392013005000171
Publication status	Published - Jan 2014

Keywords

Magnetic materials
Nanocomposites
Nanoparticles

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

More information

10.1590/S1516-14392013005000171

Cite this

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title = "Giant reversible magnetocaloric effect in flower-like β-Co(OH) 2 hierarchical superstructures self-assembled by nanosheets",

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 N{\'e}el 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.",

keywords = "Magnetic materials, Nanocomposites, Nanoparticles",

author = "Xianguo Liu and Chao Feng and Feng Xiao and Or, \{Siu Wing\} and Yuping Sun and Chuangui Jin and Ailin Xia",

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AU - Liu, Xianguo

AU - Feng, Chao

AU - Xiao, Feng

AU - Or, Siu Wing

AU - Sun, Yuping

AU - Jin, Chuangui

AU - Xia, Ailin

PY - 2014/1

Y1 - 2014/1

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AB - 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.

KW - Magnetic materials

KW - Nanocomposites

KW - Nanoparticles

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