Strontium Titanate
SrTiO3

SrTiO3 has a typical perovskite structure and it is widely used as a substrate for ferroelectric and superconductor thin films.
Our SrTiO3 substrate has world-leading quality and production volume, and it is made by integrated production system starting from Verneuil crystal growth to the surface polishing.

Nb:SrTiO3 substrate with electrical conductivity and STEP substrates with atomically flat surface are also available. We hope our substrates can help your research.

Characteristics

Composition SrTiO3
Crystal system Cubic
Space group Pm3m (Perovskite)
Lattice constant a=0.3905 nm
Melting point 2080 ℃
Growth method Verneuil method
Density 5.122 g/cm3(20 ℃)
Dielectric constant 310 (27℃,1 MHz)
Thermal expansion coefficient 11.1×10-6/℃(r.t.~1000℃)
Phase transition 110 K(tetragonal ⇔ cubic
Refractive index 2.407 (at 589 nm)

Standard specs

SrTiO3

Nb(0.05 wt%):SrTiO3

Nb≒0.1 at%

Nb(0.5 wt%):SrTiO3

Nb≒1.0 at%

Purity >99.98 % >99.98 % >99.98 %
Resistivity (Ω・cm) >107 7~10×10-2 3~7×10-3
Career density (cm-3) 1~2×1019 1~2×1020
OrientationTolerance:±0.5° (100), (110), (111) (100), (110), (111) (100), (110), (111)

Size (Outer size tolerance: ±0.1 mm / Thickness tolerance: ±0.05 mm)

10×10×0.5t

15×15×0.5t

10×10×0.5t

15×15×0.5t

10×10×0.5t

15×15×0.5t

Polishing One-side / Both-side One-side / Both-side One-side / Both-side
Surface roughness

Ra≦1.0nm

Rmax≦5.0nm

Ra≦1.0nm

Rmax≦5.0nm

Ra≦1.0nm

Rmax≦5.0nm

Flatness (λ=632.8 nm) 10×10×0.5 t :≦λ
15×15×0.5 t : ≦1.5λ
10×10×0.5 t :≦λ
15×15×0.5 t : ≦1.5λ
10×10×0.5 t :≦λ
15×15×0.5 t : ≦1.5λ
Options STEP substrate
OFF substrate
Bicrystal substrate
Breakable substrate
STEP substrate
OFF substrate
Bicrystal substrate
Breakable substrate
OFF substrate
Bicrystal substrate
Breakable substrate
※If you are looking for other specs, please contact us.
※Delivery time (about): Standard model … 1 week after order / Special model … 1 month or more after order