Product Descriptions
Gadolinium gallium garnet (GGG) substrate, one of the earlier developed garnet materials, can not be used as the substrate of high bismuth substituted iron garnet epitaxial layer because of its small lattice constant. Therefore, the sggg crystals with Ca, Mg and Zr as substitution ions are more suitable for the epitaxial films.
Main Advantages:
Low optical losses (<0.1%/cm)
High thermal conductivity (7.4W m-1K-1)
Typical applications:
Substrate materials for YIG and BIG magneto-optical epitaxial membranes
Magnetic bubble memory storage
Magnetic refrigeration
Material Properties
| Material | GGG | SGGG |
| Chemical Formula | Gd3Ga5O12 | Substituted Gd3Ga5O12 |
| Crystal Structure | Cubic | Cubic |
| Lattice Constant | a=12.383 Å | a=12.497 Å |
| Growth Method | Czochralski | Czochralski |
| Hardness | 8.0 | 7.5 |
| Density | 7.13g/cm³ | 7.09g/cm³ |
| Melting Point | 1725℃ | 1730℃ |
| Refractive Index | 1.954 @ 1064nm | 1.954 @ 1064nm |
Technical Parameters
Crystro offers:
| Dimensions | Max Diameter 101.6mm (4 inch) |
| Thickness | 0.5mm Other thickness upon request |
| Polishing | Single or double sides polishing |
| Orientation | <111>±0.2° |
| Orientation Flat | 2°（within 1° for special requirement） |
| Ra | Ra≤1nm, EPI ready |
| Angle of Crystalline | Special size and orientation are available upon request |
