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Almax Plate DAC


Screw Driven DAC for X-ray Applications
Part of the Diacell Bragg series

Now available for sale directly from our e-commerce sister website: DiamondAnvils.com.
 

Product Description

The Almax Plate DAC is an innovative diamond anvil cell based on the novel design of Prof. Reinhard Boehler at the Max Planck Institute in Mainz, Germany.  With the advent of conical diamond anvils described in the paper by R. Boehler et al., High Press. Res. 24, 391 (2004), comes the possibility of having diamond anvil cells with very large conical apertures without the drawback of obstructing materials for the incoming of outgoing beams.

In the Almax Plate DAC two kinematically-mounted steel plates are elastically deflected with the use of a driving gearbox.  Based on the lever principle, the symmetrical deflection of the plates, although very small, is enough to bring into near-contact the diamond anvils and hence generate the required pressures in the sample space.

The conical anvils are supported by tungsten carbide seats, which provides several benefits. Firstly, it circumvents the need for beryllium plates as support for the diamond anvils.  The net result is the avoidance of the usual halo coming the diffraction pattern of Be.  Secondly, the mechanical resistance of tungsten carbide, being higher than that of beryllium, provides backing seats with longer lifetime.  Thirdly, by having tungsten carbide backing plates it is possible to use the cell at high temperatures.  Of particular interest then is the use of the Boehler-Almax Plate DAC in combination with a laser heating set-up by also taking advantage of its large conical access.

The Almax Plate DAC is very easy to handle and align.  It makes use of distinctive tilt-adjustment screws and a special gear box.  Diamond anvils cannot be accidentally broken because they are only brought into contact by applying the high force necessary to bend the plates.

The gearbox required to deflect the plates is made of three high-strength, high-precision spur gears which uniformly rotate the three matching clamping screws.  These, in turn, act as levers.  The conical aperture along the axis of the diamond anvil cell is 85°, whereas the Almax PlateDAC flat design offers a horizontal aperture (in the plane of the gasket) of more than 80° on 3 sectors, offering a near-panoramic view.  The vertical opening is above 20°.

The Almax Plate DAC can be supplied with the usual selection of diamonds, type 1a Raman-selected for low- or ultra-low fluorescence or type 2ac, with conical apertures of 85° degrees on both sides of the cell.  The total height of the cell is around 21 mm for an external diameter of 49 mm.

The gasket is held in place by a convenient gasket holder, in a similar fashion to other Diacell® diamond anvil cells. Gasket materials such as steel, Inconel, beryllium copper alloy, rhenium, as well as pure beryllium (contact us for details) can be supplied with this cell.

This video here shows how easy it is to align this cell.

A gas membrane adaptor kit is available for Plate DAC - please see here.  A video animation of this gas membrane upgrading kit can be seen here.  A Huber goniometer head is also available for this gas membrane adaptor as well.

 

Applications

The Almax Plate DAC is particularly well suited for X-Ray experiments as it enables diffraction measurements with high transmission factor and very low background.  Indeed, the absence of Be plates, which are replaced by large aperture tungsten carbide seats, combined with the fact that the conical anvils are nearly 15% thinner than the standard designs, considerably enhances the X-ray transmission. The large apertures on both side also makes the cell singularly suited for use with laser heating (particularly double-sided heating) set-ups.


TECHNICAL SPECIFICATION

Cell Material Vascomax 300
Anvil Support Plate Tungsten Carbide
Pressure Mechanism Screw drive
Maximum Pressure ~100 GPa
Temperature Range Room Temperature
Top Angle X-Ray: conical 85º
Bottom Angle X-Ray: conical 85º
Lateral Access 3 sectors of 80° each in the gasket plane ; > 23° vertically
Heating Laser heating (not included)
Cooling N/A
DAC Diameter 49 mm
DAC Height 21 mm 
Working Distance to Sample 10.5 mm
Numerical Aperture 0.68
Interfacing Solution Via lateral mounting holes or customised holding ring


Maximum pressure is dependent upon the culet size of the anvils.
Almax easyLab is committed to its policy of continuous improvement.
Specifications may change without notice.
easyLab and Diacell are registered trademarks of Almax easyLab Ltd.

 


PARAMETERS

EXPERIMENTAL
TECHNIQUES
ADXD | Mossbauer | X-Ray
MAX
PRESSURE
1 GPa | 10 GPa | 100 GPa | 3.0 GPa | 30 GPa | 50 GPa
TEMPERATURE
RANGE
Room Temperature

Almax Plate DAC