LSAT Substrate

The strontium lanthanum aluminate (LSAT or (La,Sr)(Al,Ta)O3)crystal has no twins and phase transitions from the melting point to the low temperature. It has the same structure as the high-temperature superconductor YBCO. Compared with other substrates, the <001> plane has a moderate lattice mismatch with YBCO<001>. (2.5~3.5%). At the same time, the thermal expansion coefficient of this crystal is lower than that of other perovskite crystals, which can deposit films at lower temperatures to improve lattice mismatch and reduce stress.

OST Photonics offers high quality LSAT substrates for researchers and industries. Crystal orientation, size and thickness can be customized according to your requirements.

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Features

  • Good lattice matching with YBCO

  • No twins and phase transitions from the melting point to the low temperature

  • Low thermal expansion coefficient

Applications

  • Superconductive device

Processing Capability

    • Orientation: <100>,<110>,<111>, etc.

    • Dimension: 1”, 2”, 10x3mm, 10x5mm, 10x10mm, 15x15mm, 20x15mm, 20x20mm, etc.

    • Thickness: 0.5mm, 1.0mm, etc.

    • Available items: wafers, substrates, blanks and customized optics

Specification and Properties of LSAT Substrate

Crystal Structure

Quartet

Growth Method

Czochralski

Lattice Constant

a=3.756 Å   c=12.63 Å

Melting Point

1650 ℃

Density

5.92 g/cm3

Hardness

6-6.5 Mohs

Dielectric Coefficient

ε=16.8

Orientation

<100>,<110>,<111>, etc.

Orientation Tolerance

±0.5° or better

Dimension

1”, 2”, 10x3mm, 10x5mm, 10x10mm, 15x15mm, 20x15mm, 20x20mm, etc.

Dimension Tolerance

±0.1 mm or better

Thickness

0.5mm, 1.0mm, etc.

Thickness Tolerance

±0.05 mm or better

Surface Finish

Single side polished (SSP)/Double sides polished (DSP)

Roughness

Ra≤5Å

Package

Class 100 clean bag, Class 1000 super clean room