Pearl

High pressure powder diffraction

This instrument is operational,in user programme .

Pearl upgrade viewed from low angle side of instrument

A schematic drawing of the upgraded Pearl diffractometer showing the 90 degrees and low angle detectors
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Pearl has recently been rebuilt following a major upgrade funded (€1.43M) by the CSIC (Consejo Superior de Investigaciones Cientificas) in Spain. Commissioning measurements on the new beamline have been completed and the user programme of experiments has resumed.

Pearl has been specifically designed for in situ studies of materials at high pressure. The application of high pressure can induce dramatic changes in the physical properties of materials. For example, upon applying a relatively modest pressure water transforms to a crystal structure that does not melt until 100°C.

The Pearl High Pressure Facility is a medium resolution high-flux diffractometer optimised for data collection from the Paris-Edinburgh pressure cell.

Until a decade ago, high-pressure neutron diffraction studies were confined to the rather limited pressure range 0-3 GPa. The development of the Paris-Edinburgh pressure cell for use at ISIS has now extended this range by almost a full order of magnitude up to ~25 GPa. Powder diffraction experiments are routinely carried out up to ~10 GPa using ISIS supplied tungsten carbide anvils.

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