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AN0006 Dielectric Ageing

From Syfer Technology Limited
 

 
Capacitor ageing (Capacitance Drift) is a term used to describe the negative, logarithmic capacitance change that takes place in ceramic capacitors with time. The ageing process has a negligible affect on Class 1 (C0G) product but should be taken into account when measuring Class 2 (X7R, Y5V & Z5U) product. The crystalline structure for Barium Titanate based ceramics changes on passing through its Curie temperature (known as the Curie Point) at approximately 125oC. The domain structure relaxes with time and in doing so, the dielectric constant reduces logarithmically, this is known as the ageing mechanism of the dielectric constant. The more stable dielectrics have the lowest ageing rates. The start point for the ageing process is indicated for all product supplied by Syfer by the date stated on the packaging labels. If the ageing start point is not known then the ageing process can be reset by heating the capacitors to a temperature above the Curie Point. The ageing process then starts again from zero.
Product Announcements
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HV Components/CKE - High Voltage Ceramic Disk Capacitors
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Topics of Interest
Multilayer ceramic chip capacitors are renowned for their reliability but can be vulnerable to cracks when affected by PCB flexing. The resulting damage may not manifest itself immediately, but may... (Read More)
Bismuth titanate ceramics have a very high Curie temperature and operating temperatures of up to 550°C. The materials exhibit low dielectric constant, low dielectric loss and properties stable up to... (Read More)
5. Dielectric Constant. 5.1. High Dielectric Constant Materials in Ferroelectric and Piezoelectric Applications. High dielectric constant materials also have application as thin film capacitors... (Read More)
5.5 Degradation and Ageing of ZnO Surge Arresters The terms varistor degradation and varistor stability are often used to describe the electrical state of a varistor relative to its past or future... (Read More)
Barium titanate (BaTiO3) is a compound consisting of titanium, oxygen and an additional cation: barium. Barium titanates are commonly used for their specialized dielectric or piezoelectric... (Read More)