BOEHLER-ALMAX ANVILS

Introduction:

Our new Boehler-Almax High pressure diamond anvils have been designed to combine the following characteristics:

Please click on the pdf (250 kb) to read our publication on "Boehler-Almax" Anvils in "High Pressure Research". Please use this reference when using Boehler-Almax anvils.



Choose type:


Choose aperture:

Ø 2.50 mm - 30°
(X-ray aperture 4θ)
- Spectroscopy -
Ø 3.10 mm - 70°
(X-ray aperture 4θ)
- X-ray -
Ø 3.30 mm - 70°
(X-ray aperture 4θ)
- X-ray -
Ø 3.30 mm - 85 °
(X-ray aperture 4θ)
- X-ray -
Ø 4.00 mm - 80°
(X-ray aperture 4θ)
- X-ray -


Choose seat:

Conring_34

All Boehler-Almax anvils are used preferably in carbide seats; for example with 12 mm diameter and 6 mm height, with an optical aperture of 40°, 70°, 80° or 90° . Diamonds can be removed from the seat and reset.
Open the Mountinginstructions03 document, or open the following You Tube 3 minute video clip”.

When making your own seat for our Boehler-Almax anvils, please contact us to get the appropriate instructions.
The disadvantage of the Boehler-Almax anvils:


The advantage of the Boehler-Almax anvils:



Choose design number of sides:

8 sided
16 sided
Anvils_Gen_Info

Choose design modifications:

NO BEVEL
SINGLE BEVEL
DOUBLE BEVEL
Anvils_Gen_Info

Choose selections (type Ia diamond):


- Low 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

- Low fluorescence

Almax Industries 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 classifies its diamonds with respect to fluorescence according to the following criteria:

1. UV low fluorescence (click here for a typical spectrum):
Just checked by a UV lamp.
2. Raman low fluorescence (click here for a typical spectrum):
The intensity of the background fluorescence of diamond at 1000 cm-1 relative to the intensity of the single phonon Raman transition at 1332 cm-1 is less than 0.5%.
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 (click here for a typical spectrum):
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.

Publications:

Pressure-dependent structures of amorphous red phosphorus and the origin of the first sharp diffraction peaks. (Published online: 12 October 2008; doi:10.1038/nmat2290)

JOSEPH M. ZAUG, ALAN K. SOPER AND SIMON M. CLARK


A custom-designed diamond anvil cell (DAC) built to enable X-ray diffraction out to very high angles was used in our study. This DAC consists of a four-post symmetrical design with WC Boehler-Almax type backing plates and a 1.7-mm-tall, 6.5-mm-girdle-diameter, type-IB diamond on the downstream side and a conventional backing plate and diamond on the upstream side. This combination enables diffraction data to be collected at angles of up to 110°2θ. Scattering intensity varies smoothly as X-rays traverse only through air, the sample and diamond windows. The minimum sample-to-detector distance available on BL 12.2.2 is 135 mm, which combined with the highest useful energy of 35 keV limited the maximum Q-range to ~10 °A−1.


Please click on the pdf (5.2 MB) to read this publication.