Integration of a Hime Diamond into the Device Simplifies Measurement of Electrical Resistance under Ultra-High Pressure.
Researchers of National Institute of Materials Science and Ehime University, Japan, developed a new diamond anvil cell by micro-fabricating a superconducting diamond, which conducts electricity like metal and serves as electrodes, on the world’s hardest and chip-proof nano-polycrystalline diamond.
Figure: Structures of diamond anvils. In the new DAC, a Hime diamond was used as a lower anvil and a superconducting diamond, which serves as electrodes, was fabricated on top of the anvil. In the conventional DAC, pressure is generated by two pointed curettes of the lower and upper diamonds pressing on each other. In this system, electrodes need to be inserted between the curette and the gasket.
Copyright : NIMS
A research group led by Yoshihiko Takano, a leader of the Nano Frontier Superconducting Materials Group, Environment and Energy Materials Division, NIMS, and another research group led by Tetsuo Irifune, a director of the Geodynamics Research Center (GRC), Ehime University, jointly developed a new diamond anvil cell (DAC) by micro-fabricating a superconducting diamond, which conducts electricity like metal and serves as electrodes, on the world’s hardest and chip-proof nano-polycrystalline diamond (Hime diamond). As a result, the conventional practice of skillfully attaching four electrodes to a small sample (of several dozen microns) was eliminated, and thus electrical resistance measurements under ultra-high pressure have become much easier. Furthermore, because diamond electrodes can be used repeatedly, physical property measurements have dramatically improved in terms of work and economic efficiencies.
As shown in the right diagram in Figure 1, a typical DAC is a device to generate high pressure by pressing curettes of paired diamond anvils on each other. To increase the pressure generated by the device, it is necessary to make the areas of the curettes smaller. Specifically, to generate ultra-high pressure (several hundreds of thousands of atmospheric pressure), curettes need to be about 400 microns in diameter.
Operation of such a device would be very difficult due to the requirement that the sizes of the samples to be studied need to be as small as about 100 microns. To generate a million atmospheric pressure or higher, the sizes of the samples need to be even smaller, making it extremely challenging to manually attach electrodes to the samples.
Accordingly, research group micro-fabricated superconducting diamond electrodes on the top of the anvil using the electron-beam lithography method. As it is convenient to use a plate-shaped diamond for the fabrication of electrodes using lithography, they combined a plate-shaped diamond and another diamond with a curette to form a diamond anvil cell with its shape as shown in the left diagram in Figure 1.
As a result, research group succeeded in developing a new diamond anvil cell by combining the world’s hardest diamond electrodes and the world’s hardest diamond anvil. Because advanced experimental technologies are required, materials R&D under ultra-high pressure is still largely unexplored. As such, this field has great potential to offer opportunities for exploring novel materials and superconductors with extraordinary functions. We believe that this new technology will contribute to Japan’s advancement in materials development.
A part of this research was supported by the Premier Research Institute for Ultrahigh-pressure Sciences (PRIUS), which has been recognized by the Ministry of Education, Culture, Sports, Science and Technology as a shared-use research facility.
This study was presented on February 23 at a PRIUS Symposium to be held at the Geodynamics Research Center (GRC), Ehime University.
Mikiko Tanifuji | Research SEA
Novel 3-D printing technique yields high-performance composites
16.01.2018 | Harvard John A. Paulson School of Engineering and Applied Sciences
Nanotube fibers in a jiffy
12.01.2018 | Rice University
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
16.01.2018 | Materials Sciences
16.01.2018 | Life Sciences
16.01.2018 | Health and Medicine