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Updated: Jul 14, 2025

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Transonic dislocation propagation in diamond.

Kento Katagiri1,2,3,4,5, Tatiana Pikuz6, Lichao Fang3,4,5

  • 1Graduate School of Engineering, Osaka University, Suita, 565-0871, Japan.

Science (New York, N.Y.)
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Summary
This summary is machine-generated.

Ultrafast dislocation motion in diamond was observed moving faster than the speed of sound. This study provides evidence for transonic dislocation movement, crucial for understanding material properties under extreme conditions.

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Area of Science:

  • Materials Science
  • Solid Mechanics
  • Crystallography

Background:

  • Dislocation motion is key to material deformation.
  • The maximum speed of dislocations remains an open question.
  • Theoretical models suggest a limiting velocity, but transonics are possible.

Purpose of the Study:

  • To experimentally investigate ultrafast dislocation motion.
  • To determine if dislocations can exceed the speed of sound.
  • To provide evidence for transonically moving partial dislocations.

Main Methods:

  • Femtosecond X-ray radiography was employed.
  • Tracking dislocation motion in shock-compressed single-crystal diamond.
  • Visualizing the propagation of stacking faults.

Main Results:

  • Observed stacking faults propagating faster than the slowest sound wave speed in diamond.
  • Provided direct evidence of partial dislocations moving at transonic speeds.
  • Demonstrated the possibility of exceeding the predicted limiting velocity.

Conclusions:

  • Partial dislocations can move at transonic velocities.
  • Experimental evidence supports the existence of transonically moving dislocations.
  • Understanding dislocation mobility limits is vital for materials under extreme conditions.