SGGG Crystal Ca-Mg-Zr Doped Gadolinium Gallium Garnet Substrate 3 Inch 630um for BIG Epitaxial Films
SGGG Crystal (Ca-Mg-Zr Doped Gadolinium Gallium Garnet), professional substrate material specially applied for epitaxial growth of bismuth iron garnet thin films, high optical uniformity and stable crystal lattice structure for magneto-optical devices.
Gadolinium gallium garnet (GGG) substrates, one of the earliest developed materials for use as substrates, are unsuitable due to their extremely small lattice constants. As a result, SGGG crystals, which use calcium, magnesium, and zirconium as substitution ions, are more suitable as substrates for bismuth-iron garnet epitaxial films.
| Indicator Name | Dimensions or Other Information | Reference Indicators |
| Dimensic | Nominal Size | 3/4inch |
| Diameter (mm) | 3" | 76.20±0.3 |
| 4" | 101.60±0.3 | |
| Thickness (um) | 3" | 630±30 |
| 4" | 800±30 or custom | |
| Crystaloptics | / | (111)±0.1° |
| Lattice constant | / | 12.497±0.003A |
| Position the edges | Main positioning edge | [-110]±2° |
| Sub-position the edges | [-1-12]±2° | |
| Surface Quality | Flatness (degree) | Maximum value minimum value within 80% coverage area center ≤6um |
| TTV | Maximum value - minimum value within 80% coverage area center ≤6um | |
| Dislocations (dislocations) | Within 80% coverage area, center region <10/cm2 | |
| Within 10% of the center area covering 80% of the total surface area | ||
| Other Defects (Extrudedsurface) |
Within 10% of the center area covering 80% of the total surface area |
Key features:
Low fault density.
High consistency in lattice constants.
Typical applications:
The substrate material for BIG magnetoelectric epitaxial films.
Magnetic refrigeration.
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