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| There are a lot of advantages for using diamonds and sapphire, which is the hardest substance as industrial jewel parts. Please compare with other materials using following Physical Properties Chart.
|
Sapphire |
Diamond |
Quartz |
|
Density [g/cm3] |
3.97 |
3.515 |
2.201 |
Young's Modulus [ GPa ] |
470 |
1,050 |
70 |
Knoop Hardness [GPa] |
13.4 |
125 |
5.95 |
Melting Point [ °C ] |
2,053 |
Does not melt |
1,600 |
Linear Expansion Coefficient [ K-1 ] |
Parallel to C axis: 5.3 Χ 10-6 Perpendicular to C axis: 4.5 Χ 10-6 |
2.3 Χ 10-6 |
0.59 Χ 10-6 |
Specic Heat [ J/Kg·K] |
760 |
509 |
772 |
Thermal Conductivity [ W/m·K ] |
42.00 |
2,200.00 |
1.38 |
Refractive Index |
1.77 (@589.3nm) |
2.41 (@656.3nm) |
1.46 (@587.6nm) |
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