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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Strain Measurement in Single Crystals by 4D-ED.

János L Lábár1, Béla Pécz1, Aiken van Waveren2

  • 1Thin Film Physics Laboratory, Institute of Technical Physics and Materials Science, Centre of Energy Research, Konkoly Thege M. u. 29-33, H-1121 Budapest, Hungary.

Nanomaterials (Basel, Switzerland)
|March 29, 2023
PubMed
Summary
This summary is machine-generated.

A novel method precisely measures crystal strain across large areas using 4D-electron diffraction (4D-ED) and a new lattice-fitting program. This technique overcomes limitations of prior methods, enabling advanced materials research.

Keywords:
STEMboron in siliconconcentration of substitutional atomfree computer programreciprocal space lattice fittingstrain componentssuperconducting silicon

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Area of Science:

  • Materials Science
  • Crystallography
  • Condensed Matter Physics

Background:

  • Accurate strain measurement in single crystals is crucial for understanding material properties.
  • Existing methods like electron holography or HRTEM have limitations in field of view or hardware requirements.
  • A need exists for a versatile, accessible method for large-area strain analysis.

Purpose of the Study:

  • To introduce a new, broadly applicable method for measuring strain in single crystals over large areas.
  • To overcome the limitations of existing strain measurement techniques.
  • To demonstrate the method's utility in analyzing defect-induced orientation changes.

Main Methods:

  • Utilizing 4D-electron diffraction (4D-ED) data acquired via scanning transmission electron microscopy (STEM).
  • Developing a novel, free Windows-based computer program for data processing.
  • Implementing a new principle of fitting a lattice to diffraction spots for enhanced measurement precision, even with missing spots.

Main Results:

  • The new method successfully measures strain over large areas of single crystals.
  • It overcomes field-of-view limitations and avoids the need for specialized hardware.
  • The technique precisely quantifies local orientation changes caused by defects.

Conclusions:

  • The presented 4D-ED method offers a significant advancement in large-area strain measurement for single crystals.
  • The accompanying software provides an accessible and powerful tool for researchers.
  • This technique has potential applications in areas like superconductor development for qubits, exemplified by boron-doped silicon.