SrTiO3 Substrates

Twin-less crystal structure, high physical and good mechanical properties
Maximum diameter: 35mm, typical thickness 0.5 /1.0mm
Stocked and custom SrTiO3 substrates available
Surface Roughness: Ra < 0.5nm
Clean package: 1000 grade clean room and 100 grade bags
Other applications: epitaxial growth of HTSC and oxide thin films(e.g.YBCO, Bi-system, La-system,etc.), Special optical windows, high quality sputtering, Magnet Sputtering, Pulsed Laser Deposition (PLD)

Code	Size	Thickness	Orientation	Surface Finish	Unit Price	Delivery
642-001	5x5mm	0.5mm	<100>	SSP	Inquire	2 weeks
642-002	5x5mm	0.5mm	<100>	DSP	Inquire	2 weeks
642-003	5x5mm	0.5mm	<110>	SSP	Inquire	2 weeks
642-004	5x5mm	0.5mm	<111>	SSP	Inquire	2 weeks
642-005	10x10mm	0.5mm	<100>	SSP	Inquire	2 weeks
642-006	10x10mm	0.5mm	<100>	DSP	Inquire	2 weeks
642-007	10x10mm	0.5mm	<110>	SSP	Inquire	2 weeks
642-008	10x10mm	0.5mm	<111>	SSP	Inquire	2 weeks
642-009	Φ12.7mm	0.5mm	<100>	SSP	Inquire	2 weeks
642-010	Φ12.7mm	0.5mm	<100>	DSP	Inquire	2 weeks
642-011	Φ20mm	0.5mm	<100>	SSP	Inquire	2 weeks
642-012	Φ20mm	0.5mm	<100>	DSP	Inquire	2 weeks
642-013	Φ25.4mm	0.5mm	<100>	SSP	Inquire	2 weeks
642-014	φ25.4mm	0.5mm	<100>	DSP	Inquire	2 weeks

Strontium Titanate or SrTiO3 (STO) single crystal provides a good lattice match to most materials with Perovskite structure. It is an excellent substrate for epitaxial growth of HTS (High Temperature Superconductor) and many oxide thin films. Its lattice constant (3.905Å) fits the common high Tc superconductive material YBCO (3.88 Å) very well. It has twin-less crystal structure and very good physical and mechanical properties for film growth. It is suitable for various high Tc films such as YBCO, Bi-system, La-system and others. SrTiO3 is an excellent and wide applied High Tc superconductive single crystalline substrate. SrTiO3 single crystal has also been used widely for special optical windows and as high quality sputtering target. It is also suitable for different film growth technologies such as Magnet Sputtering, Pulsed Laser Deposition (PLD), Vapourization, MOCVD, CVD, and laser MBE etc. Films made by these materials and technologies on SrTiO3 wafers have excellent performance, for instance Tc>90K, Jc> = 106A/cm².

Hangzhou Shalom EO provides both stocked standard SrTiO3 (or STO) wafers and customs wafers.

Common Specifications:

Materials	SrTiO3 crystals	Orientations	＜100＞,＜110＞,＜111＞
Orientation Error	±0.5°	Maximum Diameter	35mm
Typical Thickness	0.5mm, 1.0mm	Thickness Tolerance	±0.05mm
Size Tolerance	±0.1mm	Surface Finish	SSP or DSP
Roughness	Ra<0.5nm	Cleaness and Package	1000 grade clean room, 100 grade bags

STO Basic Properties:

Crystal Structure	M6	Growth Method	Blaze method
Unit Cell Constant	a=3.905Å	Twin Structure	Twin free
Color	Colorless to light yellow	Melt Point（℃）	2080
Density（g/cm³）	5.175（g/cm³）	Hardness	6-6.5（mohs）
Thermal Expansion（/℃）	9.4×10^-6	Thermal Conductivity	120 milliwatts/cm °C at 100 °C
Dielectric Constants	ε=300	Chemical Stability	Insoluble in water
Tangent Loss	~5×10^-4（300k） ~3×10^-4（77k）	Specific Resistivity	> 10⁷Ohm/cm
Transmission Range	0.4 to 6 µm	Refraction Index	nc = 2.380 nd = 2.409 nf = 2.488
Dispersion	(nf - nc) = 0.108

Curves:

1）Typical X-Ray Diffraction (XRD) Curve of SrTiO3 Crystals Substrates

2) Typical Surface Roughness of SrTiO3 substrate <100> measured by Atomic Force Microscope (AFM) in 5μm x 5μm Scale

SrTiO3 Substrates

SrTiO3 Wafers 10x10x0.5mm <100> SSP

SrTiO3 Wafers Φ12.7mmx0.5mm <100> DSP

SrTiO3 Wafers Φ20mmx0.5mm <100> DSP