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

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)


A facile hydrothermal strategy is proposed to synthesize flower-like β-Co(OH)2hierarchical microspherical superstructures with a diameter of 0.5-1.5 μm, which are self-assembled by β-Co(OH)2nanosheets with the average thickness ranging between 20 and 40 nm. The magnetocaloric effect associated with magnetic phase transitions in Co(OH)2superstructures 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)2superstructures is a potential candidate for application in magnetic refrigeration in the low-temperature range.
Original languageEnglish
Pages (from-to)186-189
Number of pages4
JournalMaterials Research
Issue number1
Publication statusPublished - 1 Jan 2014


  • Magnetic materials
  • Nanocomposites
  • Nanoparticles

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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