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Yttria vs. Optical Silicon

Yttria belongs to the oxide-based engineering ceramics classification, while optical silicon belongs to the non-glass optical ceramics. There are 12 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is yttria and the bottom bar is optical silicon.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 390
120
Elastic (Young's, Tensile) Modulus, GPa 120
150

Thermal Properties

Maximum Temperature: Mechanical, °C 2000
1350
Melting Onset (Solidus), °C 2440
1560
Specific Heat Capacity, J/kg-K 440
700
Thermal Conductivity, W/m-K 0.3
150
Thermal Expansion, µm/m-K 8.0
3.0

Otherwise Unclassified Properties

Density, g/cm3 5.0
2.3
Light Transmission Range, µm 0.3 to 12
1.2 to 15

Common Calculations

Stiffness to Weight: Axial, points 13
35
Stiffness to Weight: Bending, points 32
75
Thermal Diffusivity, mm2/s 0.14
93