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Diacell® Bragg-(S) & Bragg-(S) Plus


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

[Formerly DXR-6]

Product Description

The very ingenious Diacell® Bragg-(S) was the first device designed by Diacell specifically for X-ray diffraction applications.  Using a screw drive mechanism and 200 μm anvil culets, pressures up to 95 GPa are achieved.  The Bragg-(S) is one of the most popular diamond anvil cells within our product portfolio.

The diamond anvil height is kept at the minimum possible for the pressure range in order to reduce absorption. Anvil alignment is achieved using a hemisphere and cup arrangement in the piston, and is maintained by means of a very high precision piston-cylinder fit.  All cells are delivered fully aligned and ready for use.

In the Diacell® Bragg-(S) load is applied by means of two bolts, one of which has a left-handed thread.  This arrangement allows a symmetrical load to be applied to the anvils, whilst no net torque is put on the device.  Accordingly, pressure on the sample may be adjusted whilst the cell is on its arcs.

The diamond anvils are mounted on high-strength beryllium support plates which permit access over 90° of 2θ from both the front and back of the cell.  These beryllium plates are easily interchanged, and some users carry sets of them with anvils of different culet sizes [the culet is the working face of the anvil upon which the sample is mounted] permanently mounted on them, so that different pressure ranges and maxima are readily accessible.

A more recent addition to the Bragg family is the Bragg-(S) Plus, which incorporates conical anvils.  This means that the beryllium support plates found on the conventional Bragg-(S) cell can be replaced by tungsten carbide ones in the Bragg-(S) Plus.

Naturally, it is also possible to convert a Bragg-(G) to a Bragg-(G) Plus (and vice-versa) by replacing the hemisphere, lower plate, anvil support plates and anvils.  Please enquiry for more details.

 

 

Applications

The particular challenge of X-ray diffraction applications is to combine such conditions with the ability to observe diffracted radiation over a wide 2θ range.  Moreover, due to the increasingly widespread use of image plates, and other high-performance X-ray area detectors, it is essential to be able to observe the entire 2θ cone of diffracted radiation.  Weak reflections which are otherwise undetectable have thereby revealed hitherto unsuspected supercells and structures. Almax easyLab offers cells which go far towards meeting these demanding criteria.  Based upon extensive finite element stress calculations, and many years of hands-on experience and practical development, these devices are manufactured to exacting standards, using carefully selected materials.  The cells are suitable for use on diffractometers and most other types of X-ray equipment, with both standard tube and synchrotron X-ray sources.  Single-crystal and powder samples are equally appropriate.


 


TECHNICAL SPECIFICATION

  Bragg-(S) Bragg-(S) Plus
Cell Material AISI 440C AISI 440C
Anvil Support Plate Beryllium Tungsten Carbide
Anvil Type Diacell Design Conical
Pressure Mechanism Screw-driven Screw-driven
Maximum Pressure ~100 GPa ~50 GPa
Temperature Range Room Temperature Room Temperature
Top Angle X-Ray: conical 90º X-Ray: conical 85º
Bottom Angle X-Ray: conical 90º X-Ray: conical 85º
Lateral Access 12° of 2θ is accessible 12° of 2θ is accessible
Heating N/A N/A
Cooling N/A N/A
DAC Diameter N/A N/A
DAC Height 35 mm approx 35 mm approx
Working Distance to Sample 14 mm 14 mm
Numerical Aperture 0.71 0.68
Interfacing Solution TBC TBC

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 | EXAFS | Mossbauer
MAX
PRESSURE
1 GPa | 10 GPa | 100 GPa | 3.0 GPa | 30 GPa | 50 GPa
TEMPERATURE
RANGE
Room Temperature

Diacell® Bragg-(S) & Bragg-(S) Plus