SrTiO₃ (STO) Strontium Titanate Crystal Substrates

CAS Number: 12060-59-2; EC Number: 235-044-1

SrTiO₃ single crystal has its lattice parameters match most materials with a Perovskite crystal structure, and therefore it is a popular crystal substrate for epitaxial growth of many oxide thin films. It is commonly used as substrate material for superconductor thin films, because Strontium Titanate (SrTiO₃) and Y-Ba-Cu-O system (a = 3.89 A) have similar values in the lattice constant.

Both standard and custom-made Strontium Titanate crystal substrates are available from MSE Supplies.

Main Physical Properties of Strontium Titanate Crystal Substrates
Crystal structure	Cubic, Perovskite
Molar mass (g/mol)	183.49
Growth method	Vernue (flame) method
Purity (%)	>99.9%
Lattice constant	a = 3.905 A
Melting point (°C)	2080
Density (g/cm³)	5.11
Hardness	6-6.5 Mohs
Refractive index	2.394
Thermal expansion coefficient (/K)	9.4 x 10^-6
Dielectric constants	300 at room temperature
Chemical stability	Insoluble in water
Loss Tangent at 10 GHz	~5x10^-4@ 300K , ~3 x10^-4@77K
Sizes	5x5 mm, 5x10 mm, 10x10 mm, 20x20 mm, or special sizes and orientations are available upon request
Thickness	0.5mm, 1.0mm
Size tolerances	+/- 0.1mm
Thickness tolerances	+/- 0.015mm
Polishing	Single side polished (SSP) or double side polished (DSP), Epi-ready surface Ra < 0.5 nm
Orientation precision	+/-0.5 degree
Crystal orientation	(100), (110), (111)
Package	Packed in class 100 grade plastic bag in class 1000 clean room