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The following presentation consists of introduction to dielectrics, and includes following topics - Basic terms, Polarization of Dielectric, Polarization method, Internal Field, Clausius-Mossotti Equation, Types of dielectric, Properties of good Dielectric, and Application of Dielectric.
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Dielectrics_1
1. Dielectrics
Prof. V. Krishnakumar
Professor and Head
Department of Physics
Periyar University
Salem – 636 011
2. IInnttrroodduuccttiioonn
• Dielectric materials: high electrical resistivities, but
an efficient supporter of electrostatic fields.
• Can store energy/charge.
• Able to support an electrostatic field while
dissipating minimal energy in the form of heat.
• The lower the dielectric loss (proportion of energy
lost as heat), the more effective is a dielectric
material.
• Another consideration is the dielectric constant,
the extent to which a substance concentrates the
electrostatic lines of flux.
3. Capacitance
• Two electrodes separated by a gap
define a capacitor.
• When a bias is applied across the
capacitor plates, one charges positively,
the other negatively.
• The amount of charge that the capacitor
can store (Q) is proportional to the bias
(V) times how good the capacitor is, the
‘capacitance’ (C).
• The capacitance is related to the area of
the plates (A), their separation (d), and
the Dielectric Constant (εεo) of the
dielectric between the plates
• Dielectric constant of vacuum; εo =
8.85x10-12 F/m=55.2 Me/(V*m)
C = ee oA
d
-
Q A V m
* 2
ee *
= = = -
V e
m
m
V
d
e
o *
4. Why does charge built up?
There is generally not a built-in electric field between the
plates of an unbiased capacitor.
When an electric field is applied, any charged carriers or
species within the material will respond.
For a conductor or semiconductor, e- will flow to the +
plate, and possibly also holes will flow to the - plate.
Current is carried=no charge buildup.
For an insulator, there aren’t a significant number of free
carriers. There are highly ionic species, however, but they
aren’t very mobile at low temperatures. No appreciable
current is carried=charge buildup.
5. Polarization in Insulators
Positively charged species in insulators shift/rotate/align toward the
negative electrode and negatively charged species shift/rotate/align
towards the positive electrode; creating dipoles. The dipole moment
density is termed the Polarization (P) and has the units of C/m2.
Electron Cloud Electron Cloud
+
+
-
E
Electronic polarization, occurs
in all insulators
-
- -
+ - +
-
+ +
+ +
E
Ionic polarization occurs
in all ionic solids: NaCl,
MgO…
-
-
-
+ +
-
+ +
E
Molecular polarization, occurs
in all insulating molecules;
oils, polymers, H2O…
Electric Dipole Moment
p = q × x
Polarization
q
A
P = p º
V
6. Dielectric Effects
Metal plates
Dielectric
C = e A
d
What makes e different from e0?
POLARIZATION
e e e
= +
=
1
0
e c
r
r
In electrostatics, the CONSTITUITIVE RELATION is
D E E P
e e
=
= = + Polarization
P E
0
0
ce
Susceptibility
7. Dielectric Effects
POLARIZATION arises from charge shifts in the material—
there is a macroscopic separation of positive charge (e.g., the
ions) and negative charge (e.g., the BONDING ELECTRONS).
Induced DIPOLE MOMENT
POLARIZATION is then
di = q × x0
There are many sources of dipoles.
Amount of charge shift
P = Ndipolesdi
8. Definitions
•Permittivity is a physical quantity
that describes how an electric field
affects and is affected by a dielectric
medium and is determined by the
ability of a material to polarize in
response to an applied electric field,
and thereby to cancel, partially, the
field inside the material. Permittivity
relates therefore to a material's ability
to transmit (or "permit") an electric
field…The permittivity of a material
is usually given relative to that of
vacuum, as a relative permittivity,
(also called dielectric constant in
some cases)….- Wikipedia
Dk
Df
'r e
"
r e
9. Permittivity and Permeability Definitions
Permittivity
(Dielectric Constant)
k = e = = -
r r r e e je
' "
e
0
•interaction of a material in the
presence of an external electric
field.
10. Permittivity and Permeability Definitions
Permittivity
(Dielectric Constant)
k = e = = -
r r r e e je
' "
e
0
•interaction of a material in the
presence of an external electric
field.
Dk
11. Permittivity and Permeability Definitions
k = e = = - ' "
r r r e e je
' "
e
0
•interaction of a material in the
presence of an external electric
field.
m = m = -
0
mr jmr
m
interaction of a material in the
presence of an external magnetic field.
Permittivity
(Dielectric Constant)
Permeability
Dk
12. Permittivity and Permeability Definitions
k = e = = - ' "
r r r e e je
' "
e
0
•interaction of a material in the
presence of an external electric
field.
m = m = -
0
mr jmr
m
interaction of a material in the
presence of an external magnetic field.
Permittivity
(Dielectric Constant)
Permeability
Dk
13. STORAGE
Electric Magnetic
Fields Fields
Permittivity Permeability
' "
Electromagnetic Field Interaction
MUT
mr = mr - jmr ' "
e r = e r - je r
STORAGE
14. STORAGE
Electric Magnetic
Fields Fields
LOSS
Permittivity Permeability
' "
Electromagnetic Field Interaction
MUT
mr = mr - jmr ' "
e r = e r - je r
STORAGE
LOSS
15. Loss Tangent
d = e
"
re
'
tan
r
e r
'r
e
''r
e
Energy Lost perCycle
Energy Stored perCycle
tand = D = 1 =
Q
D Dissipation Factor Q Quality Factor
Df
16. Relaxation Constant t
"t = Time required
for 1/e of an aligned
system to return to
equilibrium or
random state, in
seconds.
= 1 = 1
wc pfc
t
2
100
1
1
10
Water at 20o C
10 100
f,
GHz
most energy is lost at 1/t
'r e
"
r e
e w e e e
= + - ¥
j
wt
s+
¥ 1
Debye equation : ( )
17. Dielectric Effects
e s =e static
e ¥ =e optical
e 0 ln(w)
wLO wP
30-50 meV 10-15 eV
visible
infrared
Major source of POLARIZATION
is distortion of the bonding
electrons around atoms. This
leads to the normal
semiconductor dielectric
constant.
In POLAR materials, like
GaAs and SiC, the different
charge on the A and B atoms
can be polarized as well,
leading to a difference
between the optical and the
static dielectric constants.
In Appendix C, the two values for GaAs are reversed!
18.
19.
20. Definition:
A photonic crystal is a periodic arrangement
of a dielectric material
that exhibits strong interaction with light
21.
22.
23. Piezoelectric Effect
In materials with NO REFLECTION SYMMETRY (like GaAs or
many molecular species) the applied electric field produces a
DISTORTION OF THE LATTICE (size change) and vice versa.
FORCE
ELECTRIC FIELD
A common piezoelectric is Poly-Vinylidene Flouride, which is
used in a variety of stereo headsets. The most common is
crystalline quartz used as frequency control crystals—pressure
applied to the quartz has a resonance which can be used in a
feedback loop to create a highly-stable oscillator—the quartz
crystal oscillator.
There are lots of different terms in use today to describe electromagnetic properties of materials. And lots of confusion on what they all mean and how they relate to each other. So, in the next few slides, I’ll give a definitions of the terms I will be using and what they mean.
Permittivity (e), also called dielectric constant, and sometimes designated by the greek letter Kappa, describes the interaction of a material with an external electric field.
Kappa is equivalent to epsilon sub r, and is equal to the absolute permittivity, epsilon, relative to the permittivity of free space, epsilon sub zero. And it is a complex number: epsilon sub r prime minus jay epsilon sub r double prime.
Which is quite mouthful! So I will drop the sub R. When I say epsilon or permittivity, you can assume I mean the permittivity relative to free space.
To make matters more confusing, the real part of permittivity can also be called dielectric constant or Dk
So in an effort to minimize the ambiguity, I will say “the real part of permittivity”.
Permeability or mu describes the interaction of a material with an external magnetic field.
And it is also a complex number.
Both permittivity and permeability are complex but not constant (another reason why the term dielectric constant is ambiguous). Many materials exhibit considerable change over frequency and temperature.
Some materials such as iron (ferrites), cobalt, nickel and their alloys have appreciable magnetic properties for which it is valuable to measure permeability; however, many materials are non-magnetic. All materials, on the other hand, have dielectric properties.
When electric and magnetic fields pass through a material, each can interact with that material in two ways:
First:
Storage: Energy may be exchanged between the field and the material, in a bi-directional (lossless) manner
This energy storage is represented by the real part of permittivity or permeability.
Second
Loss: Energy may be permanently lost from the field, and absorbed in the material (usually as heat).
This energy loss is represented by the imaginary part of permittivity and permeability.
Another term we will talk about, and you will often see on data sheets is loss tangent. This is also called tan delta.
When complex permittivity is drawn as a simple vector diagram, the real and imaginary components are 90o out of phase. The vector sum forms an angle delta with the real axis. If we remember our trigonometry, we recall that the tangent of an angle is equal to the side opposite to the angle divided by the side adjacent to the angle. So, in this case, is the imaginary part of permittivity, divided by the real part of permittivity. This is why the term tan delta came about.
Loss tangent is also equivalent to the dissipation factor and one over the quality factor. It is a measure of the energy lost relative to the energy stored.
The term Df is also commonly used for Dissipation factor. It is no wonder people get confused, all these terms mean the same thing, Loss Tangent, tan delta, Dissipation factor, and Df.
Also of interest to many applications involving liquid and polar materials, for example microwave heating, Specific Absorption Rate, chemical processing, etc.. is the relaxation constant or time, For dipolar dielectrics (such as water), describes the time required for dipoles to become oriented in an electric field. (Or the time needed for thermal agitation to disorient the dipoles after the electric field is removed.)
At low frequencies, the dipole rotation can follow the field easily; ’ will be high and ” will be low. As the frequency increases, the loss factor, ” increases as the dipoles rotate faster and faster.
The loss factor ” peaks at the frequency 1/. Here, the dipoles are rotating as fast as they can, and energy is transferred into the material and lost to the field at the fastest possible rate.
As the frequency increases further, the dipoles can not follow the rapidly changing field and both ’ and ” fall off.
is one of the terms needed in the Debye equation that is often used to model the theoretical permittivity of polar liquids. This model works very well for water. The other terms are the predicted value of s, the DC or static value of permittivity, and at infinity.