Note: our Diacell® design anvils are made from rough diamonds. They are polished according to the (100)-crystal orientation for the highest strength.
BIREFRINGENCE |
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All diamonds to be used for anvil manufacture are examined
under a polarising microscope for birefringence. Diamonds with significant birefringence discontinuity, typical of
inclusions, etc. are rejected. In addition diamonds can be selected for ultralow birefringence. Total birefringence
is measured using crossed polarisers, a waveplate and matched to specifications. Normally: |
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1. Low birefringence <0.0001 |
2. Ultra low birefringence <0.00005 |
Culet size and modification |
Choose culet size as a function of: |
maximum pressure |
culet size |
< 5 GPa |
> 1.00 mm |
5 – 100 GPa |
1.00 mm – 0.20 mm |
> 100 GPa |
<0.20 mm, bevels up to 0.30 mm at 8° |
Note: Typical sample space is given by the gasket thickness (typically 0.10 mm or less) and the central hole diameter (typically 30-50% culet size).
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Note: single and double bevels are recommended for very high pressure and electrical measurements. |
Note: single bevels around the culet ease the cleaning of the culet and reduce the risk of damage during alignment. |
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Examples of typical requests for quote: |
Diamond anvil, type Ia, Boehler-Almax design, 16-sided, 2.50 mm – 30°, culet of 0.10 mm, bevels up to 0.30 at 8°, (100)-oriented, Raman low fluorescence, low birefringence: |
Article nr.: P00131 |
Quantity: 6 anvils. |
Diamond anvil, type Ia, Boehler-Almax design, 16-sided, 3.10 mm – 70°, culet of 0.30 mm, (100)-oriented: |
Article nr.: P00132 |
Quantity: 4 anvils. |