Ignore thermal expansion and assume that the dipole orientations are temperature dependent
Instability of capacitance The capacitance of certain capacitors decreases as the component agesIn ceramic capacitors, this is caused by degradation of the dielectricThe type of dielectric and the ambient operating and storage temperatures are the most significant aging factors, while the operating voltage has a smaller effectThe aging process may be reversed by heating the component above the Curie pointAging is fastest near the beginning of life of the component, and the device stabilizes over timeElectrolytic capacitors age as the electrolyte evaporatesIn contrast with ceramic capacitors, this occurs towards the end of life of the componentTemperature dependence of capacitance is usually expressed in parts per million (ppm) per °CIt can usually be taken as a broadly linear function but can be noticeably non-linear at the temperature extremesThe temperature coefficient can be either positive or negative, sometimes even amongst different samples of the same typeIn other words, the spread in the range of temperature coefficients can encompass zero.
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