DiacellĀ® HeliosDAC
Optical and X-Ray Spectroscopy, Pmax = 100 GPa, Tmax = 1300 K, WD = 14 mm, A = 50Ā°
- The DiacellĀ® HeliosDAC is suitable to both optical (numerical aperture of 0.42) and X-ray (2Īø up to 50Ā°) experiments
- Using an internal compact resistive gasket heater the DiacellĀ® HeliosDAC is able to reach over 1000Ā° C
- Maximum pressures of up to above 100 GPa may be obtained with the DiacellĀ® HeliosDAC
- Being a gas membrane driven DAC, the pressure within the DiacellĀ® HeliosDAC can be adjusted whilst at high temperatures
- The DiacellĀ® HeliosDAC employs a series of unique insulating stages to maintain the cell at reasonable temperature even when operating at full power
- The DiacellĀ® Helios DAC Plus is another version of this cell that employs Boehler-Almax anvils, enabling even larger X-ray apertures.
Description
The DiacellĀ® HeliosDAC has been designed specifically for the high-temperature range up to 1000 ĀŗC. It is suitable for both X-ray diffraction (2Īø up to 50Āŗ) and optical work. It has gas-membrane drive, which is particularly suitable for high temperature operation as it is easy to compensate for any pressure changes due to heating. On holding the sample at 1,000 ĀŗC for several hours, the exterior of the cell reaches a little over 400 ĀŗC.
In the DiacellĀ® HeliosDAC, heat is delivered directly to the gasket using a compact resistive heater that generates about 80 W at the gasket. With this design it is possible to generate heat within the smallest space around the anvils. This in turn avoids use of exotic construction materials and makes high temperature operation of the cell more reliable.
In high temperature operation using resistive heating it is essential to flush the interior of the cell, and all exposed faces of the diamond anvils, with a mildly reducing gas such as the commercially-available argon – 2% hydrogen mixture. This protects both the anvils and the interior of the cell from tarnishing.
Applications
There is an increasing demand for DACs that will operate at high temperatures.Ā It is generally agreed that above about 1000 ĀŗC the only realistic option is laser heating. Such installations are complex and expensive. However, for temperatures of up to 1000 ĀŗC resistive heating is attractive as it is relatively simple.Ā Therefore, the DiacellĀ® HeliosDAC is perfect for such application.
Two videos concerning the HeliosDAC are available onĀ Ā Almax easyLab’s YouTube channel.Ā The video for disassembling the heater may be found by clickingĀ here.Ā Similarly, the complementing video showing the re-assembling may be foundĀ here.
Specifications
Cell Material | AISI 440C |
Anvil Support Plate | Tungsten Carbide |
Pressure Mechanism | Gas Membrane |
Maximum Pressure | 100 GPa |
Temperature Range | 1300 K |
Top Angle | Conical 50Āŗ |
Bottom Angle | Conical 50Āŗ |
Lateral Access | None |
Heating | Internal gasket heater |
Cooling | N/A |
DAC Diameter | 56 mm |
DAC Height | 45 mm |
Working Distance to Sample | 14 mm |
Numerical Aperture | 0.42 |
Interfacing Solution | TBC |
DAC Weight | 500 g |
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
2020 – Shukla, B et al. –Ā Compressibility and thermal expansion study of d-UZr2 at high pressure and high temperature
2023 ā Vithanage, D et al. – High-pressure response of vibrational properties of b-AsxP1-x in situ Raman studies
FAQs
What is the maximum pressure I can achieve with the HeliosDAC and a given culet size?
Culet size (Āµm) | 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.
You may also like…
Share this product on:
Reviews
There are no reviews yet.