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Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application

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Pressure-Stabilized Zinc Trifluoride.

Shiyin Ma¹, Shichang Li², Tao Gao¹

¹Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China.

The Journal of Physical Chemistry Letters

|March 26, 2020

Summary

A new zinc fluoride (ZnF3) phase is stable under high pressure. This discovery reveals novel bonding behaviors and provides a reference for experimental synthesis.

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Area of Science:

Materials Science
Solid-State Chemistry
Computational Chemistry

Background:

Understanding the phase behavior of binary compounds under extreme conditions is crucial for materials discovery.
Zinc-fluorine systems are not fully characterized at high pressures.

Purpose of the Study:

To establish the high-pressure phase diagram of Zn-F binary compounds.
To identify novel stable stoichiometries and structures of zinc fluorides under pressure.

Main Methods:

Combined particle swarm optimization algorithm with first-principles calculations.
Thermodynamic stability analysis.
Electronic structure calculations.

Main Results:

A new stoichiometry, ZnF3, with space group Cccm, was found to be thermodynamically stable above 183 GPa.
The stable ZnF3 structure features unique Zn2+[F3]2- units.
Mixed ionic and covalent bonding contributes to the stability of the new phase.
Electronic properties suggest zinc's tendency towards high oxidation states under pressure.

Conclusions:

The discovery of ZnF3 provides insight into zinc's bonding behavior under extreme conditions.
This work serves as a valuable reference for future experimental synthesis and identification of high-pressure zinc fluoride phases.