Hybrid-anvil: A suitable anvil for large volume cubic high pressure apparatus

Abstract

A hybrid-anvil used in cubic high pressure apparatus is presented, which makes it possible to pressurize samples of 36 mm(3) volume up to 5.5 GPa and to heat simultaneously up to 1350-1400 degrees C for routine operation. The hybrid-anvil has been designed based on the theory of multilayered pressure vessels and massive support, which can save weight about 60.00% compared to the traditional anvil. We note from 10 000 times of experiments that the rate of failure crack decreases about 16.67% and the cost of anvil saves about 66.40% after the modification of the anvil. This represents a relatively simple and inexpensive anvil for material synthesis and research.

Temperature- and Pressure-Reducing Regimes in the Growth Cell of HPHT Diamonds, Optimal for Preserving Crystal Integrity after Growth Completion

“…The schematic of the cubic growth cell and partially of the surrounding reinforcement, shown in Figure 1, is quite standard. Other variants of the geometry and of the arrangement of insulating gaskets around the cell [9][10][11][12][13] differ only in the size and material of the gaskets, which is not essential for our consideration.…”

Evolution of nitrogen structure in N-doped diamond crystal after high pressure and high temperature annealing treatment

“…A more detailed description concerning this technique has been presented previously. [17] Annealing temperatures were maintained between 1920 K and 2120 K. The temperature was extrapolated from a correlation between the ap-plied temperature and input power, which was calibrated using a Pt6%Rh-Pt30%Rh thermocouple. The operating pressure was maintained at about 6.5 GPa, which is the estimated pressure limit for this high-pressure apparatus based on a curve derived from the pressure-induced phase transitions of bismuth, thallium, and barium.…”