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Related Experiment Video

Updated: Sep 10, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

Published on: December 29, 2016

Unexpected compound reformation in the dense selenium-hydrogen system.

Huixin Hu¹, Mikhail A Kuzovnikov², Hannah A Shuttleworth²

¹Center for High Pressure Science and Technology Advanced Research, Shanghai, China.

Communications Materials

|August 27, 2025

Summary

Under high pressure, a new compound, SeH2(H2)2, unexpectedly formed. This selenium hydride compound is non-metallic and has a unique crystal structure, differing from other chalcogen hydrides.

Keywords:

Chemical physics Phase transitions and critical phenomena Structure of solids and liquids

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Last Updated: Sep 10, 2025

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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Published on: July 27, 2022

Area of Science:

High-pressure physics and chemistry
Materials science
Solid-state chemistry

Background:

H2Se and (H2Se)2H2 compounds are unstable under compression above 22 GPa.
Previous research on chalcogen hydrides at high pressures indicated potential for novel compound formation.

Purpose of the Study:

To investigate the high-pressure phase behavior of selenium hydride.
To synthesize and characterize new selenium-hydrogen compounds under extreme conditions.

Main Methods:

High pressure-high temperature diamond anvil cell experiments.
X-ray diffraction for structural analysis.
Density functional theory calculations for structural validation.
Electrical resistance measurements.

Main Results:

A novel compound, SeH2(H2)2, was synthesized above 94 GPa.
X-ray diffraction revealed a tetragonal (I41/a m d) structure with zig-zag H-Se chains and H2 molecules in Se interstices.
Density functional theory calculations confirmed the structure with minor distortions.
Electrical resistance measurements showed SeH2(H2)2 is non-metallic up to 148 GPa.
No compound formation was observed in the Te-H system up to 165 GPa and 2000 K.

Conclusions:

The high-pressure phase behavior of chalcogen hydrides is unique and complex.
SeH2(H2)2 represents a novel high-pressure phase with a distinct crystal structure.
The findings challenge previous assumptions about the predictability of high-pressure behavior in these systems.