Hajra, Partha ; Dutta, Saurav ; Brahma, Pradip ; Chakravorty, Dipankar (2011) Magnetodielectric effect in Co3O4 nanoparticles grown within a silica glass Journal of Magnetism and Magnetic Materials, 323 (6). pp. 864-867. ISSN 0304-8853
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.jmmm.2010.11.068
Abstract
Co3O4 nanocrystals of sizes in the range 17.5-33.1 nm were grown within a sol-gel-derived silica glass matrix. Rietveld analysis of the X-ray diffraction data showed that the crystals had tetragonal symmetry. This was explained as arising due to a tensile strain induced at the glass-crystal interface as a result of thermal expansion mismatch between the phases. The crystals showed ferromagnetic behaviour with superparamagnetism setting-in at temperatures above 15 K. They also exhibited ferroelectric characteristics with large remanent polarization. Change in dielectric constant as a function of magnetic field was observed in these nanocomposites. This was discussed on the basis of magnetostriction effect.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Magnetodielectric Coupling; Nanocomposites; Cobalt Oxide; Silica Glass |
| ID Code: | 65694 |
| Deposited On: | 17 Oct 2011 10:40 |
| Last Modified: | 17 Oct 2011 10:40 |
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