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Area of Science:

  • Materials Science
  • Crystallography
  • Neutron Scattering

Background:

  • Single-crystal neutron diffraction is a powerful technique for determining atomic structures.
  • Existing diamond anvil cells have limitations in sample size, pressure stability, and portability.

Purpose of the Study:

  • To describe a novel diamond anvil cell optimized for single-crystal neutron diffraction.
  • To enhance portability, pressure stability, and sample volume for neutron diffraction experiments.

Main Methods:

  • Development of a spring-loaded diamond anvil cell with a double-conical design for polycrystalline diamond anvils.
  • Adaptation of the cell for use with multiple single-crystal diffractometers at Oak Ridge National Laboratory (ORNL).
  • Testing with glycerin as a pressure medium to establish hydrostaticity and absence of shear pressure gradients.

Main Results:

  • The optimized cell offers improved pressure stability and ease of use compared to previous designs.
  • It accommodates approximately 30%-40% taller samples than comparable single-crystal anvils.
  • Successful use of large single-crystal synthetic diamonds up to pressures of 20 GPa was demonstrated.

Conclusions:

  • The described diamond anvil cell represents a significant advancement for single-crystal neutron diffraction.
  • Its enhanced features enable more versatile and precise structural studies at major neutron facilities.
  • The cell is suitable for future ultra-low temperature and high-field studies.