PEAS-Q36 Diamond Anvil Cell

designed and made in-house by Paul Ellison

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Schematic and basic working concept of a diamond anvil cell.
(a) The principle is based on a piston-cylinder mechanism with each of the two halves containing adiamond with a flat tip or culet. Pressure is generated between the two opposing diamonds by pressing onto a sample contained within the sample chamber in a metalic or composite (made of ceramic) gasket. This force is applied to the outside of the piston, pushing it into the cylinder and is generally done using a mechanical lever, screws or by deforming a metallic membrane with a high-pressure gas.

(b) Cross section along the compression axis. Due to the transparency of diamond it is possible to access the sample enclosed between the opposing diamonds and gasket using a wide range of energies of radiation from infrared (IR) to hard X-rays.
The use of X-rays (grey) or lasers (dark grey) permits in situ diagnostics such as X-ray diffraction, X-ray fluoresence, X-ray absorption or Raman and IR spectroscopies. Such techniques can be combined with IR-lasers (red) specific for heating, enabling access to a extremely large dynamic range of pressures and temperatures within the laser-heated diamond anvil cell.