can any body told me that why the dielectric constant increase with increasing and decreasing of temperature.
It will be helpful to know the following before trying to analyze your data, or any suggestion.
What is SCT ? can you describe the composition.
and the dielectric data shown has been measured at which frequency.at
Dear Burhan,
You can find such an abnormal behavior for some perovskite like SrTiO3, BiFeO3, etc. in the literature
The first question is that, did you apply your measurements just at frequency of 1 MHz? do you have the related plots for other frequency? do you have the plots (measured at 1MHz) for x=0.3 and 0.4, at higher temperatures above which is presented in the attached figure?
Meanwhile, we are observed such a behavior in our work on BiFeO3 at frequncy of 1MHz, which you can find it here:
http://www.sciencedirect.com/science/article/pii/S0254058415300778
respected Ebrahim Mostafavi , thanks for your kind information and suggestion . off course i check it at frequency 2MHz and below 1MHZ while keeping the same temperature. The response is same at both frequency like 1MZH and 2MHZ.
respected Jose Jesus Agustin Flores Cuautle please how It can be an indicator of structure change? can you explain me little?
you can find nice backgroud in Electroceramics, Materials Properties Applications
A. J. Moulson (chapter 2.4) and in
http://www3.imperial.ac.uk/pls/portallive/docs/1/11949698.PDF
sorry respected Jose Jesus Agustin Flores Cuautle, i cannot pickup well your sentence that it indicate the change of structure. In term of symmetry, the structure shift towards lower symmetry from cubic to tetragonal, so we can say that the increase in the permativity for composition 0.5 around +80c is due to change of structure or we can say that it because of para electric phase
Dear Burhan,
Considering your statements, I think it is possible to see interesting results if you can do your measurements at higher temperatures (especially for x=0.3 and 0.4), there might be the observation an abnormal behavior in dielectric constant, same as x=0.5, but in higher temperatures rather than shown in the attached figure.
Otherwise, as Mr. Jose said, by increasing the content of cerium dopant from x=0.4 to x=0.5, the occurrence of a structural phase transition could be a possible reason for such an anomaly in dielectric constant.
Thanks respected Ebrahim Mostafavi, i will try at high temperature also and then will share and discus with you.
----------------thanks once again
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