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Related Experiment Video

Updated: Jun 30, 2025

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
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Reverse charge transfer and decomposition in Ca-Te compounds under high pressure.

Yang Lv1, Jianfu Li1, Zhaobin Zhang1

  • 1School of Physics and Electronic Information, Yantai University, Yantai 264005, China. jianfuli@ytu.edu.cn.

Physical Chemistry Chemical Physics : PCCP
|March 19, 2024
PubMed
Summary

Under high pressure, calcium-tellurium compounds exhibit a surprising charge transfer reversal, causing calcium ions to become anions and leading to decomposition into elemental solids. This reveals novel high-pressure behavior in alkaline-earth chalcogenides.

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Area of Science:

  • Materials Science
  • High-Pressure Physics
  • Computational Chemistry

Background:

  • Pressure significantly influences chemical bonding and reaction pathways.
  • Understanding material behavior under extreme conditions is crucial for discovering new properties and applications.

Purpose of the Study:

  • To investigate the structural and electronic properties of calcium-tellurium (Ca-Te) compounds under high pressure.
  • To reveal the phenomenon of charge transfer reversal and its impact on material stability.

Main Methods:

  • First-principles calculations were utilized to model material behavior.
  • The CALYPSO structural search technique was employed to predict new phases.
  • Bader charge analyses were performed to quantify charge transfer.

Main Results:

  • Several new conventional and unconventional Ca-Te phases were predicted under high pressure.
  • A novel phenomenon of charge transfer reversal was observed, where Ca ions become anions.
  • Ca-Te compounds were found to decompose into elemental Ca and Te under pressure due to weakened electrostatic interactions.

Conclusions:

  • The study demonstrates a unique charge transfer reversal mechanism in Ca-Te compounds under high pressure.
  • The findings clarify the decomposition pathway of Ca-Te into elemental solids.
  • This research provides critical insights into the high-pressure evolution of alkaline-earth chalcogenides.