Recently we prepared Sr doped YCrO3 whose P- E loop falls in second and fourth quadrand instead of ist and 3rd. NOW the same case occurs for the composite of LaNaCrO3+NiCuFe2O4.
Also here the dielectric constant of LaNaCrO3 is of 10^6order and that of NiCuFe2O4 is 10^4. But for the compsositions (1-×) LNCO +(×)NCFO where x= 0.25 and 0.5, the dielectric abruptly to 2000 and 200 order respectively. Couldnot reach the conclusion yet. Please help
The dielectric constant which you have mentioned are very very high, what was the frequency of measurements. At what frequency are these values ?
Definitely these values are un-realsitic.
What is the dielectric loss of your sample.
and What is the DC resistivity of your samples. These would help in saying whether you have a proper P-E loop
K. Sreenivas
Could you upload the picture of the loop you are getting? At which ferquency you are getting these dielectric constant value? Please try to make sure your experiments are artefact free.
Respected @ K. Sreenivasan sir and S Mishra Sir, it is worthwhile to mention here that regarding dielectric constant I have paper from RSC Advances that supports the results regarding LNCO. What the problem we face is to understand the effect of NCFO phase in 50% and 25% that abruptly decreases the dielectric constant 2000 and 200 range. I want to know what the role actually NCFO plays that daughter products are so weird compared to the parent materials. Also the behaviour of P-E loop for 50-50 % compositions of the comprising phases are bothering. I am curious to know what actual physics will be lying behind. It is second time we met the same problem after YCrO3. Though samples are single phase and have been Retvield refined too.
I have seen the plots but I am sorry to say It is not a PE loop per se, but a lossy loop of your material. See, there is no saturation in the loops you have given. If you can measure the leakage current while doing this PE loop measurement, I think you would get your answer.
I can think coarsly like this,
Upon addition of this materal NCFO, your composite gets more conducting , i.e why you are getting lossy kind loop, try measuring PE loop of just LNCO and see if the shape of the loop improves. I f it gets improved , then all dots can be connected.
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