Proprietą elettriche
Quartz glass is an excellent electrical insulator. Due to the
large spacing between the bonding electrons of the Si-O bond and
the conduction band, the electrical conductivity of quartz glass
is restricted to ionic impurities, moving within the crystal
lattice. As the diffusion coefficient of the charge carriers is
crucial for this, the electrical conductivity of quartz glass
exhibits a strict exponential temperature dependence. In
contrast to typical electrical conductors such as metals, the
resistance of quartz glass decreases with rising temperature.
The dielectric constant of quartz glass reaches values up to 4
and is far below that of traditional glass. The reason is again
the rigid silicon/oxygen structure and the lack of mobile charge
carriers. The result is that the structure has a low
polarization capacity.
Electrical Data of
Electrical resistivity in
W · m |
Electrical
Fused
Quartz
|
Flame
Fused
Quartz
|
Fused
Silica
|
|
20°C
400°C
800°C
1200°C
|
 |
1016
1010
6.3·106
1.3·105
|
1016
1010
6.3·106
1.3·105
|
1016
108
6.3·104
1.3·103
|
|
Dielectric strength in kV /
mm (sample thickness ≥ 5 mm) |
|
20°C
500°C
|
|
25 ... 40
4 ... 5
|
25 ... 40
4 ... 5
|
25 ... 40
4 ... 5
|
|
Dielectric loss angle (tg d) |
|
1 kHz
1...1000 MHz
3·104
MHz
|
0.0005
0.0001
0.0004
|
0.0005
0.0001
0.0004
|
0.0005
0.0001
0.0004
|
|
|
Dielectric constant (e) |
|
20°C
23°C
23°C
|
0...1 MHz
9·102
MHz
3·104
MHz
|
3.70
3.77
3.81
|
3.70
3.77
3.81
|
3.70
3.77
3.81
|
|
Applicazioni
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