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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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Salt-Inclusion Rare-Earth Chalcogenides: Exploring Infrared Nonlinear Optical Crystals via a Guest-Framework

Wen-Dong Yao1, Qiu-Yang Du1, Xu-Bin Ni1

  • 1School of Chemistry and Materials, Yangzhou University, Yangzhou 225002, P. R. China.

Inorganic Chemistry
|June 15, 2026
PubMed
Summary
This summary is machine-generated.

Three new europium-based chalcogenide crystals were synthesized for advanced laser technology. These materials show promising nonlinear optical properties, with one exhibiting phase-matching behavior.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Optics

Background:

  • High-performance nonlinear optical (NLO) crystals are essential for developing advanced laser technologies.
  • Salt-inclusion chalcogenides (SICs) are a promising class of materials for NLO applications.
  • Europium (Eu)-based compounds offer unique electronic and structural properties.

Purpose of the Study:

  • To synthesize novel Eu-based SICs with enhanced NLO properties.
  • To explore the structure-property relationships in these new materials.
  • To investigate the potential of guest-framework modulation for designing functional materials.

Main Methods:

  • Synthesis of three novel Eu-based SICs: [KEu4Cl][Ge3S10] (1), [Eu4Cl2][Ge3S9] (2), and [Eu7Cl2][Ge6Se18] (3) using a guest-framework modulation strategy.
  • Structural characterization to understand the diverse crystal structures, including a [Ge2Se6]4- dimer violating Pauling's third rule.
  • Optical measurements to determine second harmonic generation (SHG) responses and bandgaps.
  • Theoretical calculations to analyze electronic structure and NLO properties.

Main Results:

  • Successful synthesis of three novel Eu-based SICs with varying structures.
  • Compounds 1-3 exhibit SHG responses ranging from 0.3 to 0.9 times that of AgGaGe2S6 (AGS).
  • Bandgaps were determined to be between 1.88 and 2.15 eV, suitable for NLO applications.
  • Compound 3 is the first Ge-containing SIC to demonstrate phase-matching behavior.
  • Theoretical calculations indicated enhanced polarizability anisotropy and hyperpolarizability in the [Ge2Se6]4- dimer of compound 3 due to its unique connectivity.

Conclusions:

  • The guest-framework modulation strategy is effective for synthesizing novel Eu-based SICs with diverse structures.
  • These new materials possess promising NLO properties, including significant SHG responses and suitable bandgaps.
  • Compound 3 represents a significant advancement as the first phase-matchable Ge-containing SIC.
  • Rare-earth elements can be utilized to expand structural diversity and optimize NLO properties in SICs.