Substrate bicrystals for superconductivity

Please note standard doping levels for SrTiO3 Nb doped are: 0.05 wt%, 0.5 wt%, 0.7 wt%, 0.1 wt%. The below listed substrates are available in different sizes upon request.

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 l/4 l/4 l/2 l/4 l/4
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 (e) 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