May 04, 2024

Japanese scientists have developed a new type of diamond pressure chamber

Abstract Researchers at the National Institute of Materials Science (NIMS) and Ehime University recently developed a new diamond pressure chamber (DAC) through superconducting diamond microfabrication technology; the superconducting diamond can conduct electricity like a metal and act as an electrode. The role. Y from NIMS...
Researchers at the National Institute of Materials Science (NIMS) and Ehime University recently developed a new diamond pressure chamber (DAC) through superconducting diamond microfabrication technology; the superconducting diamond can conduct electricity like a metal and act as an electrode. effect.
The nano-frontier superconducting materials team led by Yoshihiko Takano of NIMS and the Geodynamics Research Center (GRC) led by Tetsuo Irifune of Ehime University jointly developed this new technology. The superconducting diamond obtained by micro-manufacturing technology can not only be like The metal is electrically conductive and acts as an electrode on the hardest and hard-to-break nano-polycrystalline diamond material (high-order materialized diamond; Hime diamond). The traditional process of the past requires technicians to skillfully connect four electrodes to a sample of only a few microns, and this new preparation process can be replaced directly, making the measurement of resistance under ultra-high pressure much less difficult. In addition, since the diamond electrode can be used repeatedly, the physical property measurement of the work and economic efficiency of the device is also significantly improved and improved.
As shown in the right figure of Figure 1, the conventional DAC generates a high voltage by the mutual pressing of the paired diamond curettes. In order to increase the pressure generated by the equipment, especially the ultra-high pressure requirements of thousands of atmospheric pressures, the contact surfaces of the two curettes need to be further reduced; the diameter of the curette is about 400 microns.
Since the size of the study sample is only 100 microns, such a device is very difficult to handle. To produce millions of atmospheres, the sample size needs to be smaller, and the technical difficulty of manually adding electrodes to the sample is more challenging.
In view of this, the research team used electron beam etching technology to micro-manufacture a superconducting diamond electrode on top of the anvil. Since the flaky diamond is more convenient to etch the electrode, the researchers conveniently fabricated a diamond cavity with a piece of diamond and a diamond with a curette, as shown in the left figure of Figure 1.
Combining the world's toughest diamond electrodes and diamond anvils, Japanese researchers have successfully developed new diamond pressure chambers. However, due to the requirements and limitations of experimental conditions and technological advancement, the development of diamond materials under ultra-high pressure conditions is still under preliminary exploration. (Compile: China Superhard Materials Network, please do not reprint.)

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