High-pressure and high-temperature neutron-diffraction experiments using Kawai-type multi-anvil assemblies

ABSTRACT

We applied Kawai-type multi-anvil assemblies (MA6-8) for time-of-flight neutron-diffraction experiments to achieve high-pressures and high-temperatures simultaneously. To achieve sufficient signal intensities, the angular access to the sample was enlarged using slits and tapers on the first-stage anvils. Using SiC-binder sintered diamond for the second-stage anvils that transmits neutrons, sufficient signal intensities were achieved at a high-pressure of ∼23.1 GPa. A high-temperature experiment was also conducted at 16.2 GPa and 973 K, validating the use of tungsten carbide for the second-stage anvils. The present study reveals the capability of the MA6-8 cells in neutron-diffraction experiments to attain pressures and temperatures beyond the limits of the conventional MA6-6 cells used in the high-pressure neutron diffractometer PLANET at the MLF, J-PARC.

KEYWORDS:

• Neutron-diffraction
• Kawai-type multi-anvil assembly
• MA6-6
• MA6-8
• high-pressure

Acknowledgements

Neutron diffraction experiments were performed at the Materials and Life Science Experimental Facility of the J-PARC under user programs (Nos. 2013B0118; 2017I0011; 2018I0011; 2019I0011; 2020I0011). This study was supported by JSPS KAKENHI (Grant Number 18H05224).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This study was supported by Japan Society for the Promotion of Science (JSPS KAKENHI) [grant number 18H05224].