M A El Hiti 1996 J. Phys. D: Appl. Phys. 29 501 doi:10.1088/0022-3727/29/3/002
AC electrical conductivity of Ni - Mg ferrites
M A El Hiti
Show affiliationsThe real AC electrical conductivity 
was studied as a function of frequency f, temperature T and composition x for a series of 
samples prepared using the double-sintering ceramic technique. The experimental results indicated that increases as the temperature and frequency increase and as the Ni ion substitution decreases. The Curie temperature 
and the activation energy for electrical conduction (
in the paramagnetic and 
in the ferrimagnetic region) increase as the Ni ion substitution increases. decreases while 
increases as the frequency increases and they become frequency-independent above the Curie temperature. The parameters n and B in the power law for were found to be composition- and temperature-dependent. n decreases while B increases as temperature increases. Both n and B decrease as the Ni ion substitution increases. Empirical formulae were suggested for the temperature-dependences of n and B.
- PACS
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72.20.-i Conductivity phenomena in semiconductors and insulators
- Subjects
- Dates
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Issue 3 (14 March 1996)
Received 19 January 1995, in final form 9 November 1995
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AC electrical conductivity of Ni - Mg ferrites
M A El Hiti 1996 J. Phys. D: Appl. Phys. 29 501
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