Gadolinium Gallium Garnet (Gd₃Ga₅O₁₂) is a magneto-optical and microwave substrate. It is the best substrate material for infrared optical isolator (1.3 and 1.5um), which is a very important device in optical communication. It is made of YIG or BIG film on the GGG substrate plus birefringence parts. Also GGG is an important substrate for microwave isolator and other devices, its physical, mechanical and chemical properties are all good for the above applications.

Molecular form	Gd3Ga5O12
Crystal structure	cubic m3m Garnet
Cell parameter	a =12.376Å
Melting Point	2098°K
Density	7.08 g/cm3
Specific Heat	0.3812J/g∙k
Thermal conductivity	7.05W/m∙k
Theramal expansion	9.18x10-6k-1
Dielectric constant	12.11
Hardness (Mohs)	6
Growth Method	Czockralski

Standard Size: Ф25, Ф20, 20x20, 10x10, 10x5, 10x3mm… or customer design
Thickness: 0.5mm, 1.0mm.
Thickness tolerance: ±0.02mm or 0.005mm for special order;
Polish: one side or two sides
Orientation:  <110>, <111>
Orientation accuracy: ±0.5°
Edge Orientation accuracy: 2°(or 1°for special order)
Cut with special tilt angle : available (tilt angle:1°－45°)
Micro Roughness Ra: ≤5Å(5μm×5μm)