China Sggg crystal company
China Sggg crystal supplier
Sggg crystal factory
Sggg crystal wholesale


Sggg crystal, namely Ca Mg Zr doped gadolinium gallium garnet, is an excellent substrate material for Bi Fe garnet epitaxial films.

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


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