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https://doi.org/10.1016/j.jcis.2006.10.081
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 Interfacial Lanthanide-doped Co3O4 Preceramics Pyrolysis |
Issue Date: | 15-Feb-2007 | Citation: | 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. https://doi.org/10.1016/j.jcis.2006.10.081 | 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 | URI: | http://scholarbank.nus.edu.sg/handle/10635/88482 | ISSN: | 00219797 | DOI: | 10.1016/j.jcis.2006.10.081 |
Appears in Collections: | Staff Publications |
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