Large volume high-pressure cell for inelastic neutron scattering

Area of Science:

• Condensed Matter Physics
• Materials Science
• Neutron Scattering Techniques

Background:

• Inelastic neutron scattering (INS) requires longer data collection and larger samples than neutron diffraction.
• High-pressure INS experiments are difficult due to limited sample volume and signal attenuation from standard pressure apparatus.

Purpose of the Study:

• To design and present a large-volume, optimized pressure cell for inelastic neutron scattering experiments.
• To enable high-pressure studies on larger sample volumes with improved signal transmission.

Main Methods:

• Development of a two-layered piston-cylinder pressure cell with optimized transmission.
• Utilizing specific materials for safe operation up to 1.8 GPa.
• Incorporating a piston seal to eliminate sample containers and an integrated manganin pressure gauge.

Main Results:

• The novel pressure cell allows for sample volumes exceeding 400 mm(3) at pressures up to 1.8 GPa.
• The design minimizes absorption and background scattering, enhancing data quality.
• Accurate pressure and temperature measurements are achievable throughout the operational range.

Conclusions:

• The developed pressure cell significantly advances the feasibility of high-pressure inelastic neutron scattering.
• It facilitates detailed investigations of material properties under extreme conditions, as demonstrated with UGe(2).