Diacell® One20DAC MK2
Brillouin spectroscopy, Single crystal X-ray diffraction, Pmax = 50 GPa, T = 300 K, WD = 10 mm, A = 120°
- Unique cell with a physical angle of 120 degrees on both sides, particularly suited for single crystal diffraction
- Allows a large access to the reciprocal space whilst carrying out measurements at high pressure
- The One20DAC is attractive for optical spectroscopy, in particular for Brillouin Spectroscopy with wide scattering angles
- Very flat design providing a thickness of only 17 mm, short working distance of 10 and 7 mm top and bottom side respectively
- Pressure mechanism via 4 screws, two left handed and two right handed screws on a stack of loading springs to provide smooth control of the pressure
- Possibility of internal heater (optional, Tmax = 500 K)
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Description
The One20DAC has been designed with the largest aperture available on the market in mind for X-ray and optical spectroscopy.
By providing a physical angle of 120 degrees on both sides of this diamond anvil cell, it makes it particularly suitable for Single Crystal X-ray diffraction as it enables to have access to a very large reciprocal space unequalled whilst carrying out measurements under pressure. When used for optical spectroscopy, the One20DAC is also particularly attractive for Brillouin spectroscopy as the large aperture gives a wide scattering angle and improved resolution of Brillouin spectra.
The One20DAC uses a combination of large 4.00mm Boehler-Almax anvils supported by thin WC conical seats. This feature provides the 120 degrees physical aperture of this cell. X-ray characterisation of the cell on a beamline has shown that the effective aperture of the cell with a gasket is a very impressive 112 degrees (courtesy of James Walsh-Steve Jacobsen – Norhtwestern University, IL, USA).
In turn, this combination gives the benefit of a very thin DAC, making it particularly suited to environment where space is at a premium such as on a beamline. The thickness of the One20DAC is approximately 17 mm. The working distance is also very short, in turn providing a large NA of 0.87 for optical measurements and observation.
The alignment of the diamond anvils is achieved by a combination of high precision machining of the parts and some lateral adjustment screws for both bottom and top seats.
Finally the pressure is increased via some left handed (x2) and right handed (x2) screws pressing on a stack of loading springs providing a smoother control of the force applied on the diamonds.
Applications
This cell is ideal for X-ray diffraction and related work.
Specifications
| Cell Material | Maraging steel |
| Anvil Support Plate | Tungsten Carbide |
| Pressure Mechanism | Screw Drive |
| Maximum Pressure | ~50 GPa |
| Temperature Range | 295 to 500 K |
| Top Angle | X-Ray: conical 120º |
| Bottom Angle | X-Ray: conical 120º |
| Lateral Access | N/A |
| Heating | Internal ring heater up to 500 K (option) |
| Cooling | N/A |
| DAC Diameter | 48 mm |
| DAC Height | 17 mm |
| Working Distance to Sample | 10/7 mm (upper/lower side) |
| Numerical Aperture | 0.87 |
| Interfacing Solution | Via mounting pin (included) |
| DAC Weight | 130 g |
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
2023 – Fang, W. et al. – Organic–inorganic covalent–ionic molecules for elastic ceramic plastic
2022 – Paliwoda, D. et al. – Pressure Tuning of Coupled Structural and Spin State Transitions in the Molecular Complex [Fe(H2B(pz)2)2(phen)]
2021 – Tchoń, D. et al. – Three new polymorphs of 1,8-diacetylpyrene: a material with packing-dependent luminescence properties and a testbed for crystal structure prediction
2021 – Liu, X. et al. – High-pressure reversibility in a plastically flexible coordination polymer crystal
2020 – Gadja, R. et al. – Experimental charge density of grossular under pressure – feasibility study
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 Boehler-Almax design diamond anvil, 4.00 mm – 120° Product code: [P01848] |
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Anvil Support Plate Tungsten carbide seat, 120° aperture Product code: [P01847] |
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Programmable Power Supply PS-03 – Keithley/Temperature Reader including Labview based programm. Product code: [A75060] |
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Ring Heater Ring heater & type-K thermocouple Product code: [A55100] |
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Gasket Blanks 10 mm/0.25 mm thick Stainless Steel gasket blanks Product code: [P00113] |
FAQs
What is the maximum pressure I can achieve with the One20DAC and a given culet size?
| Culet size (µm) | 200 | 300 | 400 | 500 | 600 | 800 | 1000 |
| Pmax (GPa) (*) | 50 | 30 | 20 | 13 | 9 | 5 | 3 |
(*) 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.
What steps should I follow if I can’t achieve pressures above 4-5 GPa?
Follow this detailed guide to potentially increase the pressure in your cell:
- Cell closure: Ensure that the diamonds can touch without any space between them.
- Check Alignment: If the diamonds can touch, check the alignment of the cell.
- Monitor Interference Fringes: If the cell is aligned, keep the diamonds in contact to observe interference fringes. Measure the cell’s thickness from the back of the cylinder to the top of the piston.
- Install Gasket: Place the gasket inside the cell and close it.
- Contact Without Force: Gently bring the diamonds into contact with the gasket without applying force.
- Observe Fringes: Check if pale interference fringes are visible on the gasket surfaces, indicating contact.
- Screw Inspection: Ensure that pressure driving screws are of equal length and properly aligned, with springs stacked and centred.
- Tighten Screws: Insert the screws in their respective slots and tighten them until finger-tight.
- Re-measure Thickness: Measure the thickness of the cell again, ensuring it matches the previous measurement plus the gasket thickness.
- Indent Gasket: Start gasket indentation, checking that all screws rotate evenly. If any screw tightens suddenly, stop immediately.
- Complete Process: If everything is set correctly, continue with the planned procedure.
What materials are used for the screws in the pressure cell?
- Pressure and alignment screws: Made from maraging steel (W722).
- Lateral set screws: Constructed from black HTS steel.
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