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Strontium Titanate or
SrTiO3 single crystal provides a good lattice match to most materials with
Perovskite structure. At room temperature it exists in thew cubic form,
but transforms into the tetragonal structure at temperatures less than
105K. At very low temperatures, SrTiO3 exhibits piezoelectric and
superconducting characteristics. It also exhibits a very large
dielectric constant.
SrTiO3 is an excellent
substrate for epitaxial growth of HTS and many oxide thin films. SrTiO3
single crystal has also been used widely for special optical windows and
as high quality sputtering target.
Red Optronics also supply Nb doped SrTiO3
single crystal. Nb:SrTiO3 has similar structure to pure SrTiO3 but
it is electrical conductive. Resistance of Nb:SrTiO3 varies from 0.1-0.001Ω-cm with Nb doping 0.01～0.001wt%.
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Physical
Properties:
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| Crystal
Structure |
Cube
a=3.905A |
| Growth
Method |
Flare |
| Density |
5.175g/cm3 |
| Melt
point |
2080�C |
| Hardness |
6Mohn |
| Thermal
expansion |
10.4�10-6/�C |
| Dielectric
constant |
300 |
| Zoss
Tangent at 10GHZ |
5�10-4@300k
3�10-4@>>k
|
| Color
and Appearance |
Light
brown under the light |
| Chemical
stability |
Undissolvable in water
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|
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Nb:SrTiO3 grade
|
A
|
B
|
C
|
D
|
| Nb
dopant(wt%) |
1.0 |
0.7 |
0.4 |
0.10 |
| Resistance rate (ohm-cm) |
0.0035 |
0.0070 |
0.05 |
0.08 |
| Mobility (cm2/vs) |
9.0 |
8.5 |
8.5 |
6.5 |
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