SrTiO3 (Strontium Titanate)

    SrTiO3 is an excellent and wide applied High Tc superconductive single crystalline substrate. 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. 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 substrate have excellent performance, for instance Tc > 90°K, Jc> = 106A/cm2.

SrTiO3 Boules and Finished Substrates

Crystalline Attributes:

Crystal structure

cubic       m3m    Peroviskite
Cell parameter a=3.905Å
Melting point 2353°K
Density 5.117g/cm3
Specific Heat 0.544J/g·k(300°K)
Thermal conductivity 11.2W/m·k
Thermal expansion 9.4x10-6k-1
Dielectric constant (εr) 300(295°K)   2000(80°K)   (7-15GHz)
Dielectric loss (tgδ) 　5x10-4(295°K)   2.5x10-4(80°K)   Microwave
Hardness (Mohs) 　6-6.5
Growth Method 　Flame

Substrate Specifications:

Standard Size:  Ф25，20x20，10x10，10x5，10x3mm,or customer design.

Thickness:   0.5mm，1.0mm.

Thickness tolerance: ±0.02mm Or ±0.005mm for special order.

Polish:   one or two sides.

Orientation：＜100＞ ＜110＞ ＜111＞.

Orientation accuracy: ±0.5°

Edge Orientation accuracy: 2°(or 1°for special order）

Cut with special tilt angle：available(tilt angle:1°－45°)

Micro roughness Ra：≤5Å（5μm×5μm）

　

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