The substrate is packed with 100 grade clean plastic bag under 1000 class clean room. W
arning:
MgO crystal was grown by arc melting method and nature cooling. It is difficult to get uniform perfect crystal bulk. Please check rocking curve for each substrate before depositing film. We can provide rocking curve service at $50 each if some one has no capability to inspect.
Precautions
MgO is sensitive to moisture, and must be stored in vacuum box.
Typical Properties
Crystal Structure
Cubic,a=4.216 Å
Growth Method
Special Arc Melting
Typical Purity
>99.95%
Typical Impurity (ppm)
Ca < 40,
Al < 15,
Si < 10,
Fe < 50,
Cr < 10,
B < ,
C < 10
Melting Point
2852 oC
Crystal Purity
> 99.95%
Crystal cleavage plane
<100>
Density
3.58 g/cm3
Dielectric constant
9.8
Thermal expansion
12.8 x10-6/ oC
Optical Transmission
•> 90% @ 200 ~ 400 nm •> 98 % 500 ~ 1000 nm
Crystal Prefection
No visible inclusions and micro cracking, X-Ray rocking curve available
Standard MgO Crystal Substrates Specification
Orientation
•<100> ±0.2o •<110> and <111> ±0.5o
Polished surface
EPI polished on one side or two sides to Ra < 5 Å
Special size and orientation are available upon request
