Pressure generation to 125 GPa using a 6-8-2 type multianvil apparatus with nano-polycrystalline diamond anvils

摘要: Pressures to about 125 GPa at room temperature have been confirmed by synchrotron in situ X-ray observations, using a newly designed triple-stage (6-8-2) multianvil apparatus with nano-polycrystalline diamond (NPD) as the third-stage opposed anvils. Upon heating sample fixed press load (500 tons), pressure stayed virtually same temperatures 1100 K, while it decreased 83.7 when was further increased 1300 K. This maintained for 2 hours without notable decrease during heating. The present 6-8-2 system can be used studies of observation phase transitions under these pressures, which are far higher than those achieved conventional Kawai-type 6-8 system.