LGS Substrate

Gallium silicate lanthanum crystal (LGS) is a kind of multifunctional crystal with excellent performance. The dielectric, elastic and piezoelectric constants of LGS crystal are obviously higher than those of quartz, and the electromechanical coupling coefficient of LGS crystal is 2-3 times that of quartz, which can be used to manufacture surface acoustic wave (SAW) and bulk acoustic wave (BAW) devices.

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

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Features

  • Good thermal stability

  • Low equivalent series resistance

  • High electromechanical coupling coefficient (2~3 times of quartz)

Applications

  • Surface acoustic wave (SAW) devices

  • Bulk acoustic wave (BAW) devices

Processing Capability

  • Orientation:<100>,<001>, etc.

  • Dimension: 10x10mm, 15x15mm, 5x5mm, etc.

  • Thickness: 0.5mm, 1.0mm, etc.

  • Available items: substrates, blanks and customized optics

Specification and Properties of LGS Substrate

Crystal Structure

Trigonal

Lattice Constant

a=8.170 Å   c=5.099 Å

Melting Point

1470 ℃

Density

5.75 g/cm3

Hardness

5.5~6.5 Mohs

Electromechanical Coupling Coefficient

0.28~0.46

Growth Method

Czochralski

Orientation

<100>,<001>, etc.

Orientation tolerance

±0.5° or better

Dimension

10x10mm, 15x15mm, 5x5mm, 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