Ni based ferrites, and NI-Zn ferrites which posess high resistivity and accordingly good dielectric properties (reasonably high dielectric constant and low dielectric loss) are useful for many electronic applications. Besides the discussed electrical properties, the prepared ferrites must have good magnetic properties, and magnetostrictive properties. NZFO (Ni-Zn ferrites) have potential applications.
Most ferrites are quite conducting (I mean low conductivity) with poor dielectric properties.
One application I can straight away think of is in the case of magnetoelectric composities, where ferrites and ferroelectrics have been mixed together, and the research community is looking for reasonably high magneto electric voltage coefficients, especially at zero bias magnetic fields. There are many papers in this upcoming field.
Prof. K. Sreenivas
Dear Prof. K Sreenivas,
Thank you very much for your answer.
I'll be grateful if you kindly give me the links of some of the papers.
Thank you once again for your time as well as your kind answer.
with regards
Md. Ashraf Ali
Dear ashraf ali,
I wish to say , one must understand analyse properly,before directly jumping to application potential of your result, Its not new result especially for ferrites,
see,
- conductivity is proportional to e"
- e=sqrt(e'2+e"2)
Now your observation is , conductivity and e increases (you did not mention wrt to what?, i assume it is temperature), It you corelate this, with above basic points, you will realise it is basically e"(loss factor) is increasing.
rgds
PK JHA
Dear Pardeep K. Jha,
Actually electrical conductivity and dielectric constant increases with increasing doping concentration at room temp. and 1 kHz frequency. Please tell me about this.
regards
M. A. Ali
Dear ashraf ali,
with the doping, conc. of conducting species increase , apply Nerst-Eienstein equation, estmate the value of conductivity, check your conductivity at dc or 1Hz, compare, in your case i think it would be more, in that case doping contribute to e" hence conductivity.
you case see one of my paper:
Journal of Applied Physics 117, 024102 (2015); doi: 10.1063/1.4905715
The electromagnetic properties of ferrites is strongly affected by the grain size and porosity. Also you should study Koop's two-layer model and Maxwell-Wagner polarization theory.
If you can develop NiFE2O4 wil low conductivity, low dielectric loss and a stable dielectric constant with freqeuncy (1 Hz to 100 KHz). Then there are lot of applications for high resistivity and low loss ferrite compositions.
I think you have observed high conductivity. I presume it must be ac conductivity, and in this case the dispersion of ac conductivity with frequency must be studied. You can then understand the conduction mechanism. This pertains to dielectric studies. Room temperature data can be very well analyzed, and in case you temp dependent data, the conduction mechanisms can be identified.
There are many papers which have been already published. Try to get hold of them.
You will get an idea how people analyse the dielectric data, and the typical measurements that need to be made.
In case you need some reference, I shall send hem to you in my next message.
Dear Prf. K. Sreenivas,
Thank you very much for your kind answer. I am waiting for next message.
regards
M. A. Ali
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