Magnesium Oxide MgO
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Transmission Range
0.3 to 6 μm
Refractive Index
1.7085 at 2 μm (1)
Reflection Loss
12.8% at 2 μm (2 surfaces)
Absorption Coefficient
0.05 cm-1 @ 5 μm
Reststrahlen Peak
n/a
dn/dT
19 x 10-6 K-1
dn/dμ = 0
n/a
Density
3.58 g/cc
Melting Point
2800°C
Thermal Conductivity
42 W m-1 K-1 @ 273 K
Thermal Expansion
10.8 x 10-6/°C @ 273 K
Hardness
Knoop 692 with 600g indenter
Specific Heat Capacity
877 J Kg-1 K-1
Dielectric Constant
9.65 at 1 MHz
Youngs Modulus (E)
249 GPa
Shear Modulus (G)
155 GPa
Bulk Modulus (K)
155 GPa
Elastic Coefficients
C11 = 294 C12 = 93 C44 = 155
Apparent Elastic Limit
138 MPa (20,000psi)
Poisson Ratio
0.18
Solubility
0.00062g/100g water
Molecular Weight
40.32
Class/Structure
Cubic FCC, NaCl, Fm3m, (100) cleavage
| µm | No |
|---|---|
| 0.171 | 2.319 |
| 0.180 | 2.138 |
| 0.191 | 2.039 |
| 0.200 | 1.986 |
| 0.230 | 1.892 |
| 0.276 | 1.824 |
| 0.310 | 1.795 |
| µm | No |
|---|---|
| 0.382 | 1.7668 |
| 0.436 | 1.7547 |
| 0.50 | 1.754 |
| 0.644 | 1.734 |
| 1.00 | 1.7229 |
| 2.00 | 1.7085 |
| 3.00 | 1.6915 |
| µm | No |
|---|---|
| 4.00 | 1.6679 |
| 5.00 | 1.6373 |
| 6.02 | 1.5957 |
| 7.04 | 1.543 |
| 8.07 | 1.475 |
| 9.09 | 1.389 |
| 10.64 | 1.209 |
Magnesium Oxide is grown in relatively small sizes, mainly in Japan and China. It was grown, along with a number of other xides, in the UK by Spicers at Greenwich, but ceased cintinuity when the proprietor retired. Consequently, It is quite difficult to source.
REFERENCES:
(1) Handbook of Optical constants of Solids II ISBN 0-12-544422-2