Ceramics Constant K

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Ceramics constant k.

The relative dielectric constant k is the ratio of the amount of charge that an element constructed from the ceramic material can store relative to the absolute dielectric constant 0 the charge that can be stored by the same electrodes when separated by a vacuum at equal voltage 0 8 85 x 10 12 farad meter. While the data in these charts is in most cases typical of what you will find from ceramic component suppliers it is only intended to be a general point of reference and should not be used for material selection or specification. Measurements are generally carried out at 1 khz. The dielectric constant k and loss factor tan d can be measured using a standard impedance bridge or an impedance analyzer both of which provide a direct reading.

The loss factor represents the ratio of resistance to reactance of a parallel equivalent circuit of the ceramic element figure 3. The more resin the lower the k. We have collected a number of charts detailing applications and properties for some of the most commonly used ceramic materials. The range of ks for common ceramic dielectrics is shown in table 15.

5 varies somewhat by exact resin content. At present the thermal conductivity of the prepared beo ceramics can reach 280 w m k which is 10 times higher than that of aluminum oxide al2o3 ceramics. Usually they are metal oxides that is compounds of metallic elements and oxygen but many ceramics.