Development of a technique for high pressure neutron diffraction at 40 GPa with a Paris-Edinburgh press

ABSTRACT

We have developed a technique for neutron diffraction experiments at pressures up to 40 GPa using a Paris-Edinburgh press at the PLANET beamline in J-PARC. To increase the maximum accessible pressure, the diameter of the dimple for sample chamber at the top of the sintered diamond anvils is sequentially reduced from 4.0 mm to 1.0 mm. As a result, the maximum pressure increased and finally reached 40 GPa. By combining this technique with the beam optics which defines the gauge volume, diffraction patterns sufficient for full-structure refinements are obtainable at such pressures.

KEYWORDS:

• Neutron diffraction
• Paris-Edinburgh press
• PLANET

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Acknowledgements

The authors are grateful to Drs S. Klotz and K. Komatsu for useful advice on handling the PE press and designing the anvils and gaskets. The experiment was conducted under the MLF proposals 2015I0011, 2016I0011, 2017I0011, 2018I0011.

Disclosure statement

No potential conflict of interest was reported by the authors.