SGGG
Keywords:
SGGG
Category:
- Details
- Characteristics
- Parameters
- Application
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- Commodity name: SGGG
SGGG crystal, namely Ca Mg Zr doped gadolinium gallium garnet, is an excellent substrate material for Bi Fe garnet epitaxial films.
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 refrigeration
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Material SGGG Chemical Formula Substituted Gd3Ga5O12 Crystal Structure Cubic Lattice Constant a=12.497 Å Growth Method Czochralski Hardness 7.5 Density 7.09g/cm³ Melting Point 1730℃ Refractive Index 1.954 @ 1064nm -
No. Index, Name Size or Other Information Reference Index 1 size nominal size 3/4inch 2 Diameter（mm） 3" 76.20±0.3 4" 101.60±0.3 3 Thickness
（μm）3" 630±30 4" 800±30or customized 4 crystal orientations / （111）±0.1° 5 lattice constant / 12.497±0.003Å 6 positioning edge main positioning edge [-110]±2° Secondary positioning edge [-1-12]±2° 7 Surface Quality Flatness ≤ 6µm over centered area covering 80 % of the total surface TTV ≤ 6µm over centered area covering 80 % of the total surface Dislocations ≤10 per cm2 over centered area covering 80 % of the total surface 8 Other defects
(Extended surface)3" ≤ 10 over centered area covering 80 %
of the total surfac4" ≤ 10 over centered area covering 80 %
of the total surfac
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