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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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Phase Engineering on Metastable Lanthanoid Sulfides for Polymorphic Nanocrystal Library.

Ziyun Zhong1, Hao Fu1, Chun-Hai Wang2

  • 1Tianjin Key Lab For Rare Earth Materials and Applications, Center For Rare Earth and Inorganic Functional Materials, Smart Sensing Interdisciplinary Science Center, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin, P.R. China.

Angewandte Chemie (International Ed. in English)
|February 25, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new strategy for synthesizing rare earth (RE) sulfide nanocrystals with diverse crystal structures. This breakthrough overcomes limitations in creating metastable phases, enabling new material applications.

Keywords:
metastablenanocrystalsphaserare earthsulfide

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Inorganic Chemistry

Background:

  • Rare earth (RE)-based nanocrystals (NCs) offer unique properties for various applications.
  • Synthesizing RE NCs with diverse crystal phases, especially metastable ones, is a significant challenge due to elemental properties and thermodynamic limitations.

Purpose of the Study:

  • To develop a novel strategy for phase-selective synthesis of lanthanoid (Ln) sulfide NCs.
  • To explore the phase-controlled evolution of metastable NC frameworks.
  • To construct heterostructured Ln sulfide NCs with tunable properties.

Main Methods:

  • A transition metal cation-stabilized strategy was employed for phase-selective synthesis.
  • Lattice energy-dependent thermodynamic control and facet adsorption-induced kinetic control were used to study phase evolution.
  • Phase-designed homojunction and heterostructure NCs were constructed.

Main Results:

  • Successfully synthesized monoclinic (m), orthorhombic (o), and trigonal (t) Ln sulfide NCs.
  • Quantitatively revealed the morphological and structural evolution of metastable frameworks.
  • Constructed tunable t/m-homojunction and t/o-heterostructure Ln sulfide NCs.

Conclusions:

  • The developed transition metal cation-stabilized strategy enables the synthesis of RE-based polymorphic NCs.
  • This phase-engineering protocol provides a generalizable methodology for accessing previously inaccessible nanocrystal structures.
  • The findings pave the way for a broader library of RE-based nanomaterials with tailored properties.