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Title: A study of interface-sustained ferromagnetism in 1/2(1 - x)Ln2O3-xSrO/1/3Co3O4 nano-composite
Authors: Tay, S.W.
Hong, L. 
Liu, Z.
Keywords: Ferromagnetism
Lanthanide-doped Co3O4
Issue Date: 15-Feb-2007
Source: Tay, S.W., Hong, L., Liu, Z. (2007-02-15). A study of interface-sustained ferromagnetism in 1/2(1 - x)Ln2O3-xSrO/1/3Co3O4 nano-composite. Journal of Colloid and Interface Science 306 (2) : 433-439. ScholarBank@NUS Repository.
Abstract: The binary oxide composite, consisting of rock salt-type SrO and spinel Co3O4 nano-domains, exhibits soft ferromagnetic properties at ambient temperature. This ferromagnetism is originated from interface-induction, and the magnitude of the magnetic properties can be enhanced when the spinel phase of the composite is doped by a small amount of Ln2O3 (Ln = La, Nd, for instance). In this work, we study the composites of tri-oxide, 1/2(1 - x)Ln2O3-xSrO/1/3Co3O4, where 0.01 ≤ 1 - x ≤ 0.6, by focusing on three areas: (i) generation of nano-composite dominant by interfacial phase via the pyrolysis of preceramic metallo-organic gel; (ii) influence of post-pyrolysis calcination and Ln2O3 content on the phase composition of the composite; and (iii) elucidation of different magnetic responses caused by the nature of Ln2O3 dissolved in the Co3O4 phase. The Ln3+-doped Co3O4 oxide displays only paramagnetic behavior at room temperature, but the ferromagnetic response is attained upon its mixing with SrO in nano-scale. The SrO phase plays the role in assisting Co3O4 phase with aligning unpaired electrons through interfacial induction. © 2006 Elsevier Inc. All rights reserved.
Source Title: Journal of Colloid and Interface Science
ISSN: 00219797
DOI: 10.1016/j.jcis.2006.10.081
Appears in Collections:Staff Publications

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