What is Aging in capacitance?
The capacitance of a high dielectric constant type ceramic capacitor (its typical main material is BaTiO3 with temperature characteristics of X5R, X7R, Y5V, etc) tends to decrease with the passage of time. This characteristic is called capacitance aging. Capacitance aging is a unique phenomenon of ferroelectric ceramics having spontaneous polarization. When a ceramic capacitor is heated above the Curie point (the temperature where crystalline structure changes and spontaneous polarization disappears (approximately 150°C)) and left without load until it cools below the Curie point. It becomes more difficult for spontaneous polarization to reverse with the passage of time, which, as a result, is measured as the decreased capacitance with time. This phenomenon is observed not only in Murata products but in high dielectric constant type (BaTiO3) ceramic capacitors in general. An appendix is attached with some public standards regarding capacitance aging (Monolithic ceramic capacitor: IEC38
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