"In electromagnetism, a dielectric (or dielectric medium) is an electrical insulator that can be polarised by an applied electric field."
Materials that do not conduct electricity, but support the formation of an electric field.
Electric fields and electric potential: An overview of electric fields and potentials and how they interact with dielectrics.
Polarization: An in-depth look at the concept of polarization in dielectrics, including types of polarization, measurement techniques, and applications.
Dielectric constants: A discussion of dielectric constants, including their definition, measurement, and relevance to dielectric materials.
Capacitance: An overview of capacitance and its relationship to dielectrics, including capacitance formulas, capacitors, and applications.
Electric breakdown: An examination of the process of electric breakdown in dielectrics, including the critical electric field, dielectric strength, and related phenomena.
Dielectric relaxation: An exploration of dielectric relaxation, including the physics behind the phenomenon, the measurement techniques used, and the significance of dielectric relaxation in dielectrics.
Ferroelectrics: An in-depth look at ferroelectrics, including their properties, applications, and the phenomena that give rise to ferroelectricity.
Piezoelectricity: An examination of piezoelectricity, including its definition, properties, and applications.
Pyroelectricity: An overview of pyroelectricity, including its definition, properties, and applications.
Electro-optic phenomena: An exploration of the interaction between dielectrics and light, including electro-optic effects, birefringence, and related phenomena.
Dielectric spectroscopy: An introduction to dielectric spectroscopy, including its use in studying the properties and behavior of dielectric materials.
Dielectric coatings: A discussion of dielectric coatings, including their properties and applications, and the techniques used to deposit them.
Dielectric materials in electronics: A look at the use of dielectric materials in electronics, including their applications in capacitors, semiconductors, and other devices.
Dielectric properties of biological materials: An overview of the dielectric properties of biological materials, including their relevance to medical and biological research.
Dielectric measurements: An examination of the tools and techniques used in making dielectric measurements, including impedance analyzers and dielectric spectrometers.
Polar dielectrics: These dielectrics have molecules with a permanent dipole moment, which aligns in an electric field, making them polar. Examples include water and barium titanate.
Nonpolar dielectrics: These dielectrics have molecules without a permanent dipole moment, so they do not become polar in an electric field. Examples include diamond and quartz.
Ferroelectric dielectrics: These have a spontaneous polarization that can be reversed by an electric field, making them useful in capacitors and memory devices. Examples include barium titanate and lead zirconate titanate.
Anti-ferroelectric dielectrics: These have a net zero spontaneous polarization, but have two sublattices that become polarized. Examples include barium titanate and strontium titanate.
High-k dielectrics: These have a high dielectric constant, which allows them to store more charge in a given area, making them useful for reducing the size of electronic devices. Examples include hafnium oxide and aluminum oxide.
Low-k dielectrics: These have a low dielectric constant, which makes them useful for reducing capacitance and crosstalk in high-speed electronic devices. Examples include tetraethylorthosilicate and polyimide.
Organic dielectrics: These are made of organic compounds and are used in many applications, including insulation and capacitors. Examples include polyethylene and polystyrene.
Inorganic dielectrics: These are made of inorganic compounds and are used in many applications, including insulation and capacitors. Examples include silicon dioxide and aluminum oxide.
Composite dielectrics: These are made of a combination of two or more dielectric materials to take advantage of their individual properties. Examples include polymer-ceramic composites and metal-ceramic composites.
Liquid dielectrics: These are liquids that are used as insulators and capacitors. Examples include oil and transformer oil.
"When a dielectric material is placed in an electric field, electric charges do not flow through the material as they do in an electrical conductor."
"Because they have no loosely bound, or free, electrons that may drift through the material."
"They shift, only slightly, from their average equilibrium positions, causing dielectric polarisation."
"Positive charges are displaced in the direction of the field, and negative charges shift in the direction opposite to the field."
"It creates an internal electric field that reduces the overall field within the dielectric itself."
"Those molecules not only become polarised but also reorient so that their symmetry axes align to the field."
"The study of dielectric properties concerns storage and dissipation of electric and magnetic energy in materials."
"Dielectrics are important for explaining various phenomena in electronics, optics, solid-state physics, and cell biophysics."
"A dielectric (or dielectric medium) is an electrical insulator that can be polarised by an applied electric field."
"When a dielectric material is placed in an electric field, electric charges do not flow through the material as they do in an electrical conductor."
"Because they have no loosely bound, or free, electrons that may drift through the material."
"Because of dielectric polarisation, positive charges are displaced in the direction of the field and negative charges shift in the direction opposite to the field."
"It creates an internal electric field that reduces the overall field within the dielectric itself."
"Those molecules not only become polarised but also reorient so that their symmetry axes align to the field."
"The study of dielectric properties concerns storage and dissipation of electric and magnetic energy in materials."
"Dielectrics are important for explaining various phenomena in electronics, optics, solid-state physics, and cell biophysics."
"A dielectric (or dielectric medium) is an electrical insulator that can be polarised by an applied electric field."
"When a dielectric material is placed in an electric field, electric charges do not flow through the material as they do in an electrical conductor."
"Dielectrics are important for explaining various phenomena in electronics, optics, solid-state physics, and cell biophysics."