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Stability of Conjugated Dienes01:28

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Deviatoric stress-induced phase transitions in diamantane.

Fan Yang1, Yu Lin1, Jeremy E P Dahl2

  • 1Geological and Environmental Sciences, Stanford University, Stanford, California 94305, USA.

The Journal of Chemical Physics
|October 24, 2014
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Summary
This summary is machine-generated.

Diamantane

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • High-Pressure Physics

Background:

  • Diamantane, a rigid polycyclic alkane, exhibits unique structural properties.
  • Understanding its behavior under extreme pressure is crucial for materials science.

Purpose of the Study:

  • To investigate the high-pressure structural transitions of diamantane.
  • To determine the influence of pressure and stress conditions on diamantane's phase behavior.

Main Methods:

  • Angle-dispersive synchrotron X-ray diffraction (XRD) in diamond anvil cells.
  • Raman spectroscopy under varying pressure conditions.
  • Utilized different pressure-transmitting media (silicone oil, helium) to control hydrostaticity.

Main Results:

  • Structural transitions in diamantane are highly sensitive to deviatoric stress.
  • Under non-hydrostatic conditions, phase transitions occurred below 0.15 GPa.
  • Hydrostatic conditions and helium as a pressure medium suppressed observed phase transitions up to 13 GPa.
  • Observed large hysteresis and sluggish kinetics during decompression.
  • Raman spectra showed continuous changes, indicating unit cell distortions rather than new bond formation.

Conclusions:

  • Diamantane's phase transitions are strongly dependent on the degree of hydrostatic pressure.
  • The observed transitions involve molecular packing modifications, not chemical bond changes.
  • Further research is needed to fully elucidate the high-pressure phases of diamantane.