Diacell® CryoDAC-Mega
Non-magnetic, FTIR, Pmax = 100 GPa, Tmin = 77 K, WD = 15 mm, A = 50°
Diacell® CryoDAC Series
- Non-magnetic diamond anvil cell for experiments with limited magnetic background
- Pressures up to above 100 GPa may be obtained with the Diacell® CryoDAC-Mega
- Specially suited for optical work at cryogenic temperatures, but can also accommodate scattering work
- Screw driven, the force is applied via two pairs of left hand/right hand bolts using Belleville springs for a symmetric and controlled load
- The anvils are mounted mechanically by force fitting into rings, a considerable advantage over fixing the anvils with epoxy resins
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Description
The Diacell® CryoDAC-Mega is a very versatile diamond anvil cell. Made from BeCu alloy, it is suitable for both optical and X-ray diffraction studies at cryogenic temperatures. Due to its high numerical aperture it is well suited to use with FTIR and other types of spectrometer, whilst X-ray diffraction measurements can be made up to 2θ values of 25º.
The diamond anvils are mounted within force-fitted BeCu rings, and mechanically fixed to their tungsten carbide support plates, thereby avoiding use of epoxy resins which have a limited lifetime at low temperature.
The Diacell® CryoDAC-Mega is held within two CuBe blocks. One of these is fixed to the cryostat cold station and also accepts the cylindrical DAC. The second block fits over the DAC and is used to apply load to the cell by means of four bolts. The diameter of the complete assembly is 38 mm.
Applications
Due to its high numerical aperture it is well suited to use with FTIR and other types of spectrometer, whilst X-ray diffraction measurements can be made up to 2θ values of 25º.
Specifications
| Cell Material | Beryllium Copper |
| Anvil Support Plate | Tungsten Carbide |
| Pressure Mechanism | Screw Drive |
| Maximum Pressure | 100 GPa |
| Temperature Range | 77 K |
| Top Angle | 50° Conical |
| Bottom Angle | 50° Conical |
| Lateral Access | N/A |
| Heating | N/A |
| Cooling | Via Cryostat |
| DAC Length | 63 mm |
| DAC Height | 32 mm |
| Clamp Diameter | 38 mm |
| Working Distance to Sample | 15 mm |
| Numerical Aperture | 0.42 |
| DAC Weight | 400 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
2010 – Kunes et al. – Metal-insulator transition and nature of the gap in NiS2−xSex
2012 – Ebad-Allah et al. – Polaron physics and crossover transition in magnetite probed by pressure-dependent infrared spectroscopy
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 Anvil 3.1 mm Diacell® design diamond anvils, fitted in BeCu rings for easy fitting in the CryoDAC-Mega Product code: [P00132], [M50005] |
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Anvil Support Plate Tungsten carbide seat with 50° opening angle Product code: [P00124] |
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Belleville Washers Conical spring washer used with the clamping screws Product code: [P01134] |
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Cryostat Custom Clamps Consult us to discuss your specific requirements with our engineering team Product code: [To be confirmed on application] |
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Clamps Kit for CryoDAC-Mega Clamps for cryogenic gas loading. To be used in conjunction with the Diacell® Cryoloader Product code: [A30100] |
FAQs
What is the maximum pressure I can achieve with the CryoDAC-Mega and a given culet size?
| Culet size (µm) | 200 | 300 | 400 | 500 | 600 | 800 | 1000 |
| Pmax (GPa) (*) | 114 | 98 | 63 | 41 | 28 | 16 | 10 |
(*) 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.
Why do you have some pressure increase when cooling down?
In earlier versions of the CryoDAC Mega, clamping screws were made of stainless steel, which caused significant thermal contraction and pressure variation. This issue was partially resolved by switching to BeCu screws and later by modifying the clamping plates to fit Belleville springs, further reducing pressure variation with temperature changes.
If you have an older CryoDAC Mega and want to upgrade, you can order the kit [A68004], which includes two clamps, four clamping screws, and all the Belleville springs.
What makes the CryoDAC Mega unique?
The CryoDAC Mega is a low-temperature diamond anvil cell designed to allow observing and collecting light in the horizontal plane, which is crucial for setups with limited space in cryostats. Its unique pressure application mechanism uses two clamping plates and a combination of left-handed and right-handed screws to prevent torque and ensure the diamond remains aligned during pressurization. BeCu springs reduce pressure variation during cooling at cryogenic temperatures. Additionally, the cell’s BeCu construction, including all screws, ensures a very low magnetic background, making it ideal for magneto-optical applications like the KERR effect.
Is it possible to carry out electrical resistivity with the CryoDAC Mega?
In principle, yes, but the CryoDAC Mega is not specifically designed for this purpose, so the setup might be awkward to implement. If it is a requirement, contact us.
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