Multianvil press

Figure 6. Most commonly employed multianvil presses (a) tetrahedral, (b) cubic (c) split-sphere (d) Kawai-type (e) Dia-type.

Sohds or mixed solids are compressed in flexible compressible containers and on applying a high pressme, dense, high coordination nimiber phases are formed. Depending on the geometry of the device, different techniques have been apphed [3] piston-cylinder press can achieve 50 kbar and 1800 K multianvil press up to 200 kbar and above 2000 K and belt design up to 150 kbar and 2300 K. 

High-pressure mineral physics therefore is concerned with the characterization of the physical properties and stability fields of planetary materials under extreme pressure and temperature conditions. For example, conditions present at the centre of the earth are thought to be in excess of 300 GPa and 5000 K. Such conditions can at present be obtained by laser-heated diamond anvil cells or multianvil presses. Emphasis of current in situ diffraction... 

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