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Related Experiment Video

Updated: Nov 18, 2025

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

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Mixed Coordination Silica at Megabar Pressure.

Cong Liu¹, Jiuyang Shi¹, Hao Gao¹

¹National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.

Physical Review Letters

|February 5, 2021

Summary

Researchers discovered a new silica phase stable at extreme pressures (645-890 GPa). This mixed-coordination silica, with coordination numbers ranging from six to nine, may exist in the interiors of giant planets like Neptune.

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Preparation of Functional Silica Using a Bioinspired Method

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Last Updated: Nov 18, 2025

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

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Published on: August 1, 2018

Area of Science:

Materials Science
Planetary Science
High-Pressure Physics

Background:

Silica (SiO2) is crucial for industrial applications and scientific research.
Understanding silica's behavior under extreme pressure is vital for planetary science.

Purpose of the Study:

To predict new crystalline phases of silica under high pressure.
To investigate the properties of these novel silica phases.
To understand the composition of giant planet interiors.

Main Methods:

Crystal structure searching method.
First-principles calculations.
Analysis of density, electronic band gap, and coordination number.

Main Results:

A new ground state crystalline phase of silica (R3[over ¯] symmetry) was predicted, stable at 645-890 GPa.
This phase exhibits mixed coordination numbers (six, eight, and nine) for silicon atoms, with an average of eight.
Stable silicon superoxides (Cmcm SiO3 and Ccce SiO6) were also identified in this pressure range.

Conclusions:

The new silica phase bridges existing gaps in density, band gap, and coordination number between known phases.
This mixed-coordination silica may be present in the cores or mantles of super-Earth exoplanets and giant planets.
The findings enhance the high-pressure phase diagram of silicon oxides and planetary interior models.