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Type Ia Standard design
(normal, Raman low / ultra low fluorescence)

Thick girdle and large table to withstand the hightest pressures.
All dimensions are exact and consistent.
Optimum mechanical strength.
 
Dimensions

Type Ia – Standard design – (100)-oriented
X in mm Appr Weight   Product
code
2.50 0.09 P01003
2.75 0.12 P01004
3.00 0.14 P01005
3.25 0.21 P01006
3.50 0.25 P01007
3.75 0.31 P01008
4.00 0.35 P01009
4.25 0.46 P01010
4.50 0.55 P01011
4.75 0.64 P01012

Note: Standard design anvils are made from rough diamonds. They are polished according to the (100)-crystal orientation for the highest strength.
 
FT-IR Spectrum
 
Type Ia Standard design
 
 
 
 
Fluorescence and birefringence
 
FLUORESCENCE
 
Almax easyLab can select its diamonds for low fluorescence. Standard measurements include laser excitation at 532 nm and covers fluorescence background in the range of 542 to 608 nm (Raman shifts between 1000 and 3000 cm-1). Measurements for different wavelength ranges can be made available on request. In special cases customers can select their own diamonds for low fluorescence using their own measurement set-up. Almax easyLab classifies its diamonds with respect to fluorescence according to the following criteria:
 
1. UV low fluorescence
Just checked by a UV lamp.

 
2. Raman low fluorescence
The intensity of the two-phonon Raman transition at 2664 cm-1 is at least 1.25 times the intensity of the background fluorescence of diamond.

 
3. Raman ultra low fluorescence
The intensity of the two-phonon Raman transition at 2664 cm-1 is at least 2 times the intensity of the background fluorescence of diamond.

 

BIREFRINGENCE
 
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:
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).
 
 
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.

 

Examples of typical requests for quote:

Diamond anvil, type Ia, Standard design, 16-sided, 3.75 mm, culet of 0.10 mm, bevels up to 0.30 at 8°, (100)-oriented, Raman low fluorescence, low birefringence:
Article nr.: P01008
Quantity: 6 anvils.

Diamond anvil, type Ia, Standard design, 16-sided, 3.25 mm, culet of 0.30 mm, (100)-oriented:
Article nr.: P01006
Quantity: 4 anvils.