Magnesium Aluminate
MgAl2O4
Chemical name
Magnesium Aluminate
Mineral name
Spinell
Chemical formula
MgAl2O4
Melting point [°C]
1950
Crystal system
cubic
Unit cell
a [Å]:8.10
b [Å]:8.10
c [Å]:8.10
Twinning
domaine structure
Mohs hardness
8
Density [g/cm3]
3.61
Color
colourless
Refractive Index
nd=1.727 (at 500 nm)
Piezoelectric crystals
 
 
Crystal growth method
Czochralski, flame fusion method (3.5 : 1)
Crystal growth orientation
(100), (110), (111)
Maximum size
2 inch in diameter
Variations
dopands on request
Dielectric constant
8 - 9
Dielectric loss tangent (10 GHz)
3.0*10^(-5) || c-axis RT; 8.6*10^(-5) ^c-axis RT
Specific resistivity [W/cm]
10^16
Transmission range
0.2 - 6.0 mm
Orientation
(001), (111), (110), other orientations on request
Dispersion
0.012