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Related Experiment Video

Updated: Aug 19, 2025

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

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Visualizing the Formation of High-Entropy Fluorite Oxides from an Amorphous Precursor at Atomic Resolution.

Lei Su1, Xi Chen2, Liang Xu1

  • 1State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China.

ACS Nano
|December 1, 2022
PubMed
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This study reveals a four-stage formation mechanism for high-entropy oxides (HEOs) using atomic-resolution microscopy. These insights are crucial for designing advanced HEO materials with tailored properties.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Chemistry

Background:

  • High-entropy oxides (HEOs) offer tunable properties for catalysis, energy storage, and thermal barriers.
  • Understanding HEO nucleation and growth at the atomic scale is key for material design but remains challenging.

Purpose of the Study:

  • To visualize and elucidate the atomic-scale formation mechanism of high-entropy fluorite oxides from a polymeric precursor.
  • To provide atomistic insights for the rational synthesis of HEOs with controlled structures and properties.

Main Methods:

  • Atomic resolution *in situ* gas-phase scanning transmission electron microscopy (STEM).
  • Observation of the entire formation process of HEOs from a polymeric precursor.

Main Results:

Keywords:
amorphous precursorgrain growthhigh-entropy oxideliquid phasenucleation

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Related Experiment Videos

Last Updated: Aug 19, 2025

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  • A four-stage formation mechanism was identified: nucleation ( < 400 °C), diffusive grain growth ( < 900 °C), liquid-phase-assisted homogenization (at 900 °C), and entropy-driven recrystallization (>900 °C).
  • Visualized the transition from polymeric precursor to stabilized HEO structure.

Conclusions:

  • Atomistic insights into HEO formation are critical for controlling grain size and morphology.
  • Enables rational synthesis of high-entropy oxides for advanced applications.