Certainly, I can provide you with the dielectric constants (also known as relative permittivities) of some common capacitor dielectrics. The dielectric constant is a measure of a material's ability to store electrical energy in an electric field. It indicates how much the electric field within a material is reduced compared to the electric field in a vacuum.
Here are the dielectric constants for a few common capacitor dielectrics:
Vacuum (Air): Dielectric Constant ≈ 1.0006
A vacuum or air has a nearly constant value close to 1, which serves as a reference point for comparing other materials.
Ceramic (Porcelain): Dielectric Constant ≈ 5 - 7
Porcelain and some ceramic materials have relatively low dielectric constants and are commonly used in capacitors.
Paper: Dielectric Constant ≈ 2 - 3.5
Paper-based dielectrics are used in some capacitors, often for lower voltage applications.
Mica: Dielectric Constant ≈ 5 - 8
Mica is a natural mineral with good dielectric properties, making it suitable for capacitors.
Polypropylene: Dielectric Constant ≈ 2.2 - 2.3
Polypropylene is a common plastic used in capacitors due to its low dielectric constant and excellent stability.
Polystyrene: Dielectric Constant ≈ 2.4 - 2.7
Polystyrene is another plastic with low dielectric constant used in capacitors, particularly in audio applications.
Polyester (Mylar): Dielectric Constant ≈ 3 - 3.5
Polyester film, often referred to as Mylar, is used in capacitors and has a moderate dielectric constant.
Polyethylene: Dielectric Constant ≈ 2.2 - 2.4
Polyethylene is used in some capacitors, especially those requiring good insulation properties.
Tantalum Pentoxide (Ta2O5): Dielectric Constant ≈ 25 - 30
Tantalum capacitors often use tantalum pentoxide as the dielectric, which has a higher dielectric constant compared to many other materials.
Aluminum Oxide (Al2O3): Dielectric Constant ≈ 8 - 11
Aluminum electrolytic capacitors may use aluminum oxide as the dielectric, which has a moderate dielectric constant.
Barium Titanate: Dielectric Constant ≈ 100 - 300 (varies)
Barium titanate is a ferroelectric material with a high dielectric constant, used in certain applications where high capacitance is required.
Please note that these values are approximate and can vary based on factors such as temperature, frequency, and the specific composition of the material. Dielectric constants can also be affected by manufacturing processes and impurities. Always refer to the datasheets provided by manufacturers for precise and up-to-date information on dielectric constants for specific capacitor dielectrics.