Substrates & Bicrystals

Substrates & Bicrystals

I. Substrate single crystals for superconductivity

Crystal Structure M.P.
[°C]
Dielectric constant Growth Technique Info
LaAlO3 Rhombo
a=3.790Å
c=13.11Å
2100 24.5 CZ
ø2"
view
Th:
LaAlO3
Cubic
a=7.57Å
2080 24.0 CZ
ø30mm
view
MgO Cubic 2800 10 ? view
NdCaAlO4 Tetrag.
a=3.685Å
c=12.12Å
1850 19.5 CZ
ø30mm
NdGaO3 Orthor.
a=5.43Å
b=5.50Å
c=7.71Å
1600 25 CZ
ø2"
view
SrLaAlO4 Tetrag.
a=3.756Å
c=12.63Å
1650 16.8 CZ
ø20mm
SrLaGaO4 Tetrag.
a=3.84Å
c=12.68Å
1600 / CZ
ø20mm
SrTiO3 Cubic
a=3.90Å
2080 300 Verneuil
ø20mm
view
YAlO3 Orthog.
a=5.176Å
b=5.307Å
c=7.355Å
1870 16`20 CZ
ø30mm
YSZ Cubic
a=5.41Å
~2500 27 Flux view

II. Substrate bicrystals for superconductivity

Material SrTiO3 MgO  Al2O3 YSZ  Nb:SrTiO3
Dimensions (mm) 10 x 10 x 0.5 10 x 10 x 0.5 10 x 10 x 0.5 10 x 10 x 0.5 10 x 10 x 0.5
Surface Orientation (100) ± 1° (100) ± 1° (1012) ± 1° (100) ± 1° (100) ± 1°
Surface Finish one side polished
Junction Angle 24° ± 1°
36.8° ± 1°
24° ± 1° 24° ± 1° 24° ± 1°
36.8° ± 1°
24° ± 1°
36.8° ± 1°
Flatness ¼ ¼ ½ ¼ ¼
Surface Roughness Ra 10Å,
Rmax 30Å
Ra 10Å,
Rmax 50Å
Ra 10Å,
Rmax 50Å
Ra 10Å,
Rmax 30Å
Ra 10Å,
Rmax 30Å
Crystal Structure cubic cubic hexagonal cubic cubic
a

Lattice Constant (Å)b

c
3.905 4.213 4.758



12.99
5.139 3.905
Phase Transition tetragonal
< 110K
tetragonal
< 110K
Dielectric Constant (εr) 310 10 9 27 310
Coefficient of Expansion
(10-6/°C)
11.1 14.2 7.5 10.3 11.1
Melting Point (°C) 2080 2800 2030 2500 2080

For other substrates and specifications please demand a quotation. The standard Nb doping amounts of Nb:SrTiO3 are 0.05 and 0.5 wt %. Surface roughness was measured using TALYSTEP (80µm width).

 

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