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Alpha Quartz vs. CVD Diamond

Alpha quartz belongs to the non-glass optical ceramics classification, while CVD diamond belongs to the non-oxide engineering ceramics. There are 11 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is alpha quartz and the bottom bar is CVD diamond.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 91
1050
Poisson's Ratio 0.13
0.1

Thermal Properties

Specific Heat Capacity, J/kg-K 720
500
Thermal Conductivity, W/m-K 8.5
1900
Thermal Expansion, µm/m-K 9.5
1.0

Otherwise Unclassified Properties

Density, g/cm3 2.7
3.5
Light Transmission Range, µm 0.13 to 3.4
0.22 to 100
Refractive Index 1.6
2.4

Common Calculations

Stiffness to Weight: Axial, points 19
170
Stiffness to Weight: Bending, points 57
96
Thermal Diffusivity, mm2/s 4.4
1080