Abstract
Pressure calibration experiments were performed at room temperature for a Drickamer-type apparatus using a composite anvil system with a sintered diamond anvil, which can be replaced by nano-polycrystalline diamond anvil. The culet diameter and tapering angle are 1.0 mm and 30°, respectively. Transitions in Fe2O3 (50 GPa) and CoO (55 GPa) were observed at 39.6 and 38.5 kN, respectively, by electrical resistance measurements. Pressure of about 120 GPa can be generated at the maximum load of 98 kN by assuming the linear extrapolation of the obtained load-pressure relation. The Drickamer-type apparatus with nano-polycrystalline diamond anvils has potential to generate pressure covering the whole lower mantle.
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