Aperture and Diameter
Most likely the main parameter you will have to decide upon is the conical aperture 2θ required. We have a choice ranging from 30° up to 120° (X-ray). The schematic below shows the difference between optical (αO) and X-ray apertures (αX). Generally speaking X-ray diffraction will require larger aperture whereas for optical spectroscopy apertures up to 50° will usually be sufficient.
X (mm) – Diameter; α – Aperture; T(mm) – Table, Htc – Total height to culet
The Boehler-Almax diamond anvils can be used both for optical spectroscopy measurements and for X-ray diffraction where large apertures (up to 120°) are required. This design provides an optimised mechanical support for the anvil’s crown section achieved by a perfect match between the anvil and the tungsten carbide (WC) seat.
These anvils can be used in conjunction with:
Almax easyLab diamond anvil cells:
Optical: Diacell® μScopeDAC Plus and HeliosDACPlus.
X-ray: Plate DAC, Diacell® Bragg Plus and Bragg Mini, SymmDAC100, TozerDAC, One20DAC.
Newly designed or existing DACs (retrofit):
In most cases, the WC seat can be adapted to the dimension requirements of your DAC. Consult us.
Almax easyLab offers four types of WC seats which are represented below. At the time of ordering, you will be able to specify the key dimensions (D, H, T, S, A).
Boehler-Almax anvils are glued into their carbide seats. The gluing procedure can be received upon simple request or downloaded from our website. Open the Mountinginstructions03 document, or open the following You Tube 3 minute video clip. We can supply you with the appropriated gluiing jig.
|Cylindrical with top taper
||Tapered with Top Taper
We have compiled a series of technical documents (brochures, articles, technical drawings, …) which you might find useful to help you understand this product better.
2004 – Boehler, R. , De Hantsetters, K. – New anvil designs in diamond-cells
2008 – Moggach, S.A. et al. – Incorporation of a new design of backing seat and anvil in a Merrill–Bassett diamond anvil cell
2013 – Loubeyre, P. et al. – Hydrogen phase IV revisited via synchrotron infrared measurements in H2 and D2 up to 290 GPa at 296 K
2014 – Stinton, G. W. , MacLeod, S.G. at al. – Equation of state and high-pressure/high-temperature phase diagram of magnesium
2014 – Pepin, C. et al. – New Iron Hydrides under High Pressure
How to chose the culet size ?
The culet size is to be decided as a function of the maximum pressure or the sample size. 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)
|Pmax (GPa) (*)
|Culet size (mm)
||< 0.20 mm, bevels up to 0.30 mm at 8°
(*) The Pmax values are only indicative. The maximum pressure achievable with a DAC is influenced by many others experimental parameters, like the gasket characteristics (material, thickness and hole size) or the pressure transmitting medium.
How the culet looks like?
||Culet with single bevel
||Culet with double bevel
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.: P01035
- 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.: P01036
- Quantity: 4 anvils.