GGG（Gadolinium Gallium Garnet）

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=12.383 Å （） Melting point 2098 （g/cm3） Density 7.08 （J/g·k） Specific Heat     0.3812   （W/m·k） Thermal conductivity 7.05 （x10-6k-1） Thermal expansion 9.18 （εr） Dielectric constant 12.11 （Mohs） Hardness 6 Growth Method   Czockralski
	Specifications 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°) Microroughness Ra：≤5Å（5μm×5μm）