Dear Atendra,
your question is more generalised. for example bismuth ferrite is one of well known material where the dielectric constant is usually high because of the high leakage current behaviour. doping in A site and / or B site will influence the electrical behaviour there by altering the dielectric constant. therefore we can simply argue dielectric constant decreases with increases in temperature on doping.
https://www.researchgate.net/post/why_the_dielectric_constant_increases_with_increases_in_temperature_at_high_frequency_region
You can refer to the links from my answer for more information and helpful animations.
Generally as the temperature increases, more thermal noise gets added to the lattice and overall the individual atomic dipole moments "lose" orientation quicker. This results in an effective reduction in the polarization or the dielectric constant.
you question is not well defined.
you should let us know what material you are investigating, and what is the temperature range, and and what temperature are you seeing the decrease in the dielectric constant, and what frequency are you measuring the dielectric constant.
the above questions will enable us to answer correctly your query.
K. Sreenivas
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