Alumina Ceramic Dielectric Constant

Alumina is generally available in two concentrations.

Alumina ceramic dielectric constant. For the composite ceramic filled with 1 wt rgo nanosheets the average ε value was 18 05. Coorstek has developed over 100 unique alumina compositions optimized for specific application requirements. Relative permittivity can be expressed as ε r ε ε 0 1. In general low dielectric constants i e polypropylene result in a fast substrate while large dielectric constants i e alumina result in a slow substrate.

1 ln ε λ i ln ε i where ε is the complex permittivity and λ i and ε i are the ratio and dielectric constant of the i phase respectively. Contact your component supplier for more detailed information. F dielectric constant aluminum phosphate 6 aluminum powder 1 6 1 8 amber 2 8 2 9 aminoalkyd resin 3 9 4 2 ammonia 74 25 ammonia 30 22 ammonia 40 18 9 ammonia 69 16 5 ammonia gas 32 1 0072 ammonium bromide 7 2 ammonium chloride 7 amyl acetate 68 5 amyl alcohol 180 35 5 amyl alcohol 68. 96 alumina is primarily used in high temperature co fired circuits while 99 5 alumina is primarily used in thin film networks.

The dielectric loss tangent is defined by the angle between the capacitor s impedance vector and the negative reactive axis as illustrated in the diagram to the right. Typical alumina al 2 o 3 99 5 properties. Alumina represents the most commonly used ceramic material in industry. This ceramic is the workhorse of the microwave integrated circuit mic business.

Dielectric constants of common materials materials deg. Alpha phase alumina is the strongest and stiffest of the oxide ceramics. On the basis of the mixing law the dielectric constant can be decided by the following formula. High purity alumina is usable in both oxidizing and reducing atmospheres to 1925 c.

Ceradyne and ceramic industry disclaim any and all liability from error omissions or inaccuracies in the above chart. The data came from coorstek. The versatility of alumina stems from its broadly impressive material properties ease of manufacture wide availability and budget friendly cost. Our ceramics experts tailor the choice of alumina grade to meet the specific application requirements.

As a leading technical ceramics manufacturer coorstek offers an extensive line of aluminas. Low dielectric loss ceramic expertise. Relative permittivity is the ratio of the permittivity of a substance to the permittivity of space or vacuum. Its high hardness excellent dielectric properties refractoriness and good thermal properties make it the material of choice for a wide range of applications.