Electrical properties of iron-silica nanocomposites synthesized by electrodeposition

Banerjee, S. ; Ghosh, A. K. ; Chakravorty, D. (1999) Electrical properties of iron-silica nanocomposites synthesized by electrodeposition Journal of Applied Physics, 86 (12). pp. 6835-6840. ISSN 0021-8979

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Official URL: http://jap.aip.org/resource/1/japiau/v86/i12/p6835...

Related URL: http://dx.doi.org/10.1063/1.371759


Nanometer-sized iron particles with diameters in the range 5.5-11.1 nm were grown within a silica gel by an electrodeposition method. Electron diffraction measurements show that some of the iron particles were oxidized to Fe3O4. dc resistivity measurements over the temperature range 110-300 K show a T−¼ variation indicating a variable range hopping transport. ac conductivity over the frequency range 100 Hz-2 MHz show an overlapping large polaron tunneling mechanism to be operative. The dielectric modulus spectra as a function of frequency were analyzed on the basis of a stretched exponential relaxation function. The values of the exponent β as extracted from this analysis were in the range 0.38-0.46. The activation energies corresponding to the maximum of the imaginary part of the dielectric modulus were in the range 0.13-0.20 eV. These are ascribed to an electron tunneling mechanism.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Iron; Silicon Compounds; Nanostructured Materials; Electrodeposition; Electron Diffraction; Hopping Conduction; Polarons; Electrical Resistivity
ID Code:65026
Deposited On:15 Oct 2011 12:14
Last Modified:15 Oct 2011 12:14

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