With the increase of temperature lattice parameters will change of the material as a result the the contributions of dielectric constant like space charge, ionic and dipolar polarizations will change. As a whole permittivity will change.
In a dielectric material, there are many type of polarizations (atomic, ionic, orientational, space charge polarizations) which contribute for the net polarization in the material. Their contribution increases with temp upto transition temp in dielectrics and then falls
Polar dielectrics ( ferroelectric oxides etc., )will exhibit temperature dependence, whereas non-polar dielectrics should not exhibit any temperature dependence.
The temperature has a significant effect on the properties of dielectrics, which can affect their performance in various applications. At low temperatures, dielectrics generally have a higher dielectric strength, because low temperatures reduce the thermal motion of molecules in the material, making it less likely for electrons to move and cause an electrical breakdown. However, as the temperature increases, the dielectric strength of a material generally decreases leading to partial discharges and the breakdown of the dielectric causes detrimental performance. Thus it can be said that the dielectric strength of a material is inversely proportional to the temperature.
Furthermore, the dielectric constant decreases with increasing temperature, as the thermal motion of molecules interferes with the alignment of dipoles in the material, reducing its ability to store energy. The effect of temperature on dielectrics depends on the specific material and application, and it is important to consider temperature effects while designing and using dielectric materials.
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