Diacell® ShearDAC
Raman Spectroscopy, Pmax = 50 GPa, T = 300 K , WD = 17.50 mm, A = 80°, Full 360° rotation of the piston
Diacell® LeverDAC Series
- The Diacell® ShearDAC is equipped with internal gears that enable a full 360° rotation of the piston anvil relative to the fixed cylinder anvil
- This cell is ideal for performing spectroscopic experiments with simultaneous shear and static high-pressure
- Maximum pressures of up to above 50 GPa can be achieved
- Smooth rotation is obtained by an extremely careful machining of the piston and cylinder
- Fitted with ultra low fluorescence anvils the Diacell® SherDAC may be used for Raman spectroscopy
- The cell can also be fitted with Boehler-Almax design diamond anvils, for an enlarged observation top angle.
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Description
The Diacell® ShearDAC is a diamond anvil cell ideal for performing experiments with simultaneous shear and static high-pressure up to above 50 GPa.
The cell’s design is based on the megabar diamond anvil cell Diacell® LeverDAC-Mega and allows for controlled shear. The additional gearing enables the rotation of the piston anvil relative to the fixed cylinder anvil. Using a set screw, the position and orientation of the cylinder can be fixed to prevent concurrent rotation with the piston. Extremely careful machining of the piston and cylinder allows for unhindered rotation.
It is possible to use a wide range of existing experimental techniques and pressure media with the Diacell® ShearDAC. Preparation of the cell for experiments is very much similar to those of more conventional diamond anvil cells.
The Diacell® ShearDAC was originally fabricated for J. Ciezak (US Army Research Lab) and validated on a sample of calcite at 0.5 GPa (5 kbar). Raman measurements show the onset of the phase transformation from calcite to aragonite at 10° of rotation (c.f. Ciezak, J. and Jenkins, T., Rev. Sci. Instrum. 82, 073905 (2011)).
Specifications
| ShearDAC [A22000] | ShearDAC Plus [A22100] | |
| Cell Material | Maraging steel | Maraging steel |
| Anvil Design | Diacell | Boehler-Almax |
| Anvil Support Plate | Tungsten Carbide | Tungsten Carbide |
| Pressure Mechanism | Lever Arm Drive | Lever Arm Drive |
| Maximum Pressure | 50 GPa | 50 GPa |
| Temperature Range | 300 K | 300 K |
| Top Angle | 34º Conical | 80º Conical |
| Bottom Angle | 9º Conical | 8.8º Conical |
| Lateral Access | N/A | N/A |
| Heating | N/A | N/A |
| Cooling | N/A | N/A |
| Lever Arm Length / Width | 165 mm/ 76 mm | 165 mm/ 76 mm |
| DAC Diameter | 33 mm | 44.5 mm |
| DAC Height | 89 mm | 70.5 mm |
| Working Distance to Sample | 17.5 mm | 15 mm |
| Numerical Aperture | 0.29 | 0.64 |
| DAC Weight | 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.
Documents
We have compiled a series of technical documents (brochures, articles, technical drawings, …) which you might find useful to help you understand this product better.
Technical documentation
Technical Drawing
Please contact us for further details on the engineering drawings.
Articles
2011 – Ciezak, J. and Jenkins, T.A. – Optical cell for in situ vibrational spectroscopic measurements at high pressures and shear
Spares, Accessories and Options
Our diamond anvil cells are aligned and mechanically tested before leaving our factory on their way to your laboratory.
They also come supplied with the required basic tooling, including gasket blanks, to use them. All is contained in the transportation casing to move around laboratories easily.
Below you can find some of the accessories and spares you might also consider. If you cannot find what you need, please do not hesitate to contact our team.
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Diamond Anvils 3.10 mm Diacell® design diamond anvils Product code: [P00132] |
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Anvil Support Plate 34 degree, Tungsten carbide seat Product code: [P00892], [P00893] |
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Diamond Anvils 3.30 mm Boehler Almax design diamond anvils Product code: [P00539] |
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Anvil Support Plate Seat, WC (H10F) Conical 85 deg. 12.8 mm Product code: [P00542] |
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Gasket Blanks 10.00 mm/ 0.25 mm thick Stainless Steel gasket blanks Product code: [P00113] |
FAQs
How many washers are needed, and how should they be stacked?
For the ShearDAC Springs (P00901), only single springs should be used, not nests of four as previously mentioned. Each spring provides approximately 200 kg of force at 75% deflection. When combined with the lever arms, this results in 800 kg at the piston.
Please note the following assembly instructions:
- Springs should be arranged in singles, not pairs or nests.
- The spring closest to the bolt head should have the narrow end facing the head.
To optimize the setup, it’s recommended to reduce the number of springs to 26 (or possibly 24) to allow for better screw engagement at the start.
How many turns of the worm shaft are needed for a 10-degree piston rotation?
To achieve a 10-degree rotation of the piston, you will need to make approximately 1.5 turns of the worm shaft.
Here’s how it works:
- One turn of the worm shaft rotates the worm gear by one full turn.
- It takes 20 turns of the worm shaft to rotate the spur gear by 360 degrees since the spur gear has 20 teeth.
- A full rotation of spur gears and corresponds to 0.37 turns of spur gear, which has 54 teeth. This results in around 133 degrees of piston rotation.
Thus, for a 10-degree piston rotation, you’ll need to turn the worm shaft about 1.5 times.
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