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X-ray Crystallography02:18

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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.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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BaSbBS4: a record-high-performance birefringent crystal identified by a target-driven closed-loop strategy.

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This summary is machine-generated.

Researchers developed a new framework to discover infrared birefringent materials with high birefringence and wide band gaps, crucial for optoelectronics. They identified several superior crystals, including BaSbBS4, which exhibits record-breaking performance.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Crystallography

Background:

  • Developing infrared (IR) birefringent materials with large birefringence (Δn) and wide band gaps (Eg) is critical for high-power optoelectronic applications.
  • A significant challenge exists due to the inherent trade-off between high birefringence and wide band gaps.

Purpose of the Study:

  • To develop an efficient framework for discovering novel IR birefringent materials with desirable optical properties.
  • To overcome the contradictory relationship between birefringence and band gap in material design.

Main Methods:

  • A target-driven, closed-loop framework integrating functional motif and crystal structure screening.
  • Deep learning-assisted high-throughput optical property computation.
  • Targeted experimental validation and mechanism investigation.

Main Results:

  • Identified superior IR birefringent crystals containing [BS3]3- and/or stereochemically active lone pair (SCALP) groups.
  • Discovered six crystals with huge birefringence (Δn > 1.0) and three with large birefringence (Δn > 0.5) and wide band gaps (Eg > 3.5 eV).
  • Highlighted BaSbBS4, demonstrating a record high birefringence (Δn = 0.95) at a wide band gap (2.70 eV) due to synergistic [BS3]3- and [SbS3]3- motifs.

Conclusions:

  • The developed framework enables efficient discovery of high-performance IR birefringent materials.
  • BaSbBS4 represents a significant advancement in wide-band-gap birefringent crystals for optoelectronics.
  • This approach provides a universal method for evaluating optical functional materials.