I have got first peak at 100 C which is the transition temperature from Ferroelectric to paraelectric according to literature. But at higher temperature i got another peak of dielectric maxima. What we can say about that peak. I here attach a graph.
in my opinion the first peak due to the effect of the interface of the system, but the second peak of at high temperature presents the critical temperature.
See: https://www.researchgate.net/publication/258303939_Pyroelectric_dielectric_properties_and_hysteresis_loops_of_a_ferroelectric_bilayer_system_described_by_the_transverse_Ising_model_with_long-range_interactions
Article Pyroelectric, dielectric properties and hysteresis loops of ...
Since the composition of compound is not known, I cite two examples where the presence of two peaks are reported in the literature.
[I]Firstly in RMn2O5 [R= A rare earth,Y ions] where two steps successive phase transitions are reported to be induced by a COMMENSURATE MAGNETIC ORDERING both with the diamagnetic[Y] as well as paramagnetic rare earth ions[Tb,Tm].
[II] The second of Ba2 Sr0.25 TiO3 , though, different but also shows shows two peaks as shown in a curve attached here with.
Since the composition of compound is not known, If you are sure that the first peak refers to a phase transition and no water in the sample, the second peak may be related to another phase of the material, but to be more accurate as the information would be necessary to have knowledge of the material which is studying.
can u attach loss spectrum with temp. if really system enter into paraelectric then ur loss should increase after 100C. check it. its better to check the connections properly while doing measurement. if possible repeat the measurement.
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