Abstract
The low frequency (20 Hz to 1 MHz) ac conductivity and magnetoconductivity behaviour of ceramic nanocomposite (Ni-SiO2) at low temperature down to 77 K are reported. The frequency dependent conductivity followed the power law, σ(ω) ∝ ωs. The fractional exponent s is a function of temperature and was found to increase with increasing temperature. This type of variation may be attributed to small polaron hopping. A peak present in the loss tangent indicates the presence of a Debye relaxation process. The magnetoconductivity of the samples is positive, which strongly depends on frequency. A firm theoretical explanation of frequency dependent magnetoconductivity is still lacking.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
C. Suryayanarayan: Bull. Mater. Sci. 17 (1994) 339.
S. Banerjee and D. Chakraborty: Trans. Ind. Ceram. Soc. 59 (2000) 1.
A. Chatterjee and D. Chakraborty: J. Phys. D: Appl. Phys. 22 (1989) 1386.
G.C. Das, S. Mukherjee, and A. Basumallick: Bull. Mater. Sci. 13 (1990) 255.
A. Basumallick, G.C. Das, and S. Mukherjee: Thermo Chem. Acta 325 (1999) 167.
A. Chatterjee and D. Chakraborty: J. Phys. D: Appl. Phys. 23 (1990) 1097.
S. Banerjee, A.K. Ghosh, and D. Chakraborty: J. Appl. Phys. 86 (1999) 6835.
J.L. Gittleman, Y. Goldstein, and S. Bozowski: Phys. Rev. B 5 (1972) 3609.
P. Sheng, B. Abeles, and Y. Arie: Phys. Rev. Lett. 31 (1973) 44.
B.E. Yoldas: Am. Ceram. Soc. Bull. 54 (1995) 289.
K.G.K. Warrier: Trans. Ind. Ceram. Soc. 54 (1995) 144.
W.D. Kingery, H.K. Bowen, and D.R. Uhlmann: An Introduction to Ceramics, John Wiley & Son, 1976, P–867.
N.F. Mott and E.A. Davis: Electronic Processes in Nano-crystalline Materials, 2nd ed., Clarendon Press, Oxford, 1979.
S.R. Elliot: Adv. Phys. 36 (1987) 135.
A.R. Long: Adv. Phys. 31 (1982) 553.
A.N. Papathanassioou, I. Sakellis, J. Grammatikakis, E. Vitoratos, S. Sakkopoulos, and E. Dalas: Synthetic Metals 142 (2004) 81.
M. Pal, K. Sega, B.K. Chaudhuri, and H. Sakata: Philos. Mag. 83 (2003) 1379.
I.G. Austin and N.F. Mott: Adv. Phys. 18 (1969) 41.
H. Tokumoto, R. Mansfield, and M.J. Lea: Philos. Mag. B 46 (1982) 93.
B.I. Shklovskii: Pis'ma Zh. Eksp. Teor. Fiz. 36 (1982) 43 [Sov. Phys.-JETP Lett. 36 (1982) 51].
B.I. Shklovskii: Sov. Phys.-Semicond. 17 (1983) 1311.
B.I. Shklovskii and A.L. Efros: Electronic Properties of Doped Semiconductors, Springer, Berlin, 1984, p. 202.
W. Schoepe: Z. Phys. B 71 (1988) 455.
V.L. Nguyen, B.Z. Spivak, and B.I. Shklovskii: Pis'ma Zh. Eksp. Teor. Fiz. 41 (1985) 35 [Sov. Phys.-JETP Lett. 41 (1985) 42].
V.L. Nguyen, B.Z. Spivak, and B.I. Shklovskii: Zh. Eksp. Teor. Fiz. 89 (1985) 1770 [Sov. Phys.-JETP 62 (1985) 1021].
U. Sivan, O. Entin-Wohiman, and Y. Imry: Phys. Rev. Lett. 60 (1988) 1566.
R. Rosenbaum, A. Milner, R. Haberkern, P. Haussler, E. Palm, T. Murphy, S. Hannahs, and B. Brandt: J. Phys.: Condens. Matter 13 (2001) 3169.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Sarkar, A., Ghosh, P., Chattopadhyay, S.K. et al. Frequency dependent magnetoconductivity and conductivity study in Ni-dispersed silica nano-composite produced by sol-gel technique. Czech J Phys 56, 201–210 (2006). https://doi.org/10.1007/s10582-006-0080-z
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s10582-006-0080-z