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Dielectric Properties (Polarisation Mechanisms (Electronic P (All…
Dielectric Properties
Polarisation Mechanisms
Electronic P
All dielectric materials
Small Charge Displacement
Small Polarisation Amount
Atomic/Ionic P
Ion Displacement within crystal structure
Effect
Pyroelectricity
Piezoelectricity
Ferroelectricity
Dipole/Orientation P
Non symmetrical molecules have permanent dipoles orient in electric field
Larger Charge Displacement
Higher Polarization
Space Charge P
Random Space Charges
Cosmic Radiation
Thermal Deterioration
Fabrication Process
Piezoelectricity
Piezoelectricity
Electricity => Mechanical
Pyroelectricity
Polarisation cause by temp
Ferroelectricity
Spontaneous Polarisation
High Permettivity
Polarisation Orientation by Electric Field
Produce Hysteresis Loop btwn E and P
Components
Capacitor
Charge-Storage Plate
Dielectric
Purpose
Increase Capacitance
Limit Capacitor Voltage
Dielectric Strength
Insulation
Charge Separation
Non-Conductive
Dielectric Variables
Dielectric Constant
Ability to polarise & store energy of electric field
Temp
Electronic Polarisation insensitive
Orientation Polarisation dependent
Ionic Polarisation increases with temp
Ion Mobility
Charge Carrier Increase
Dielectric Strength
Capability of material to withstand electric field w/o breaking down
Materials
BaTiO3
High Dielectricity
Perovskite Crystal Structure