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Updated: Feb 14, 2026

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

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Phosphorus Dimerization in Gallium Phosphide at High Pressure.

Barbara Lavina^1,2, Eunja Kim², Hyunchae Cynn³

¹High Pressure Science and Engineering Center , University of Nevada , Las Vegas , Nevada 89154 , United States.

Inorganic Chemistry

|February 10, 2018

Summary

This summary is machine-generated.

Gallium phosphide (GaP) forms a new super-Cmcm structure (oS24) at high pressures. This phase is thermodynamically stable above 20 GPa and features unique P-P bonds.

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Area of Science:

Materials Science
Solid-State Physics
Computational Chemistry

Background:

Gallium phosphide (GaP) is an important semiconductor.
Understanding its high-pressure behavior is crucial for materials science.
Previous studies proposed various polymorphs of GaP under pressure.

Purpose of the Study:

To determine the stable structure of gallium phosphide at high pressure.
To investigate the thermodynamic stability of different GaP polymorphs.
To elucidate the bonding and coordination characteristics of high-pressure GaP phases.

Main Methods:

Combined experimental (e.g., high-pressure synthesis) and computational (first-principles enthalpy calculations) approaches.
Analysis of crystal structure, bonding, and coordination geometries.
Investigation of thermodynamic stability across various pressure ranges.

Main Results:

Gallium phosphide (GaP) adopts the super-Cmcm structure (oS24) at 43 GPa and 1300 K.
The oS24 phase is thermodynamically more stable than previously proposed polymorphs above approximately 20 GPa.
This phase exhibits significant bonding differentiation and distorted fivefold P-atom coordination, including a P-P bond of 2.171(11) Å.

Conclusions:

Phosphorus dimerization in GaP provides key insights into the super-Cmcm phase.
The findings offer critical new understanding of high-pressure polymorphism in octet semiconductors.
Bond directionality and anisotropy are identified as factors contributing to the low symmetry of this high-pressure phase.