H4W
H4W is a metastable tungsten hydride compound that exhibits semimetallic electronic behavior.
About H4W
H4W is a tungsten hydride phase characterized by its near-zero-gap electronic structure, placing it in the category of semimetallic materials. Given its position above the thermodynamic hull, it is considered a metastable compound that exists under specific synthesis conditions.
This material is of significant interest in high-pressure physics and materials science, where researchers investigate the bonding behavior of hydrogen with transition metals. With multiple reported structures across various databases, it serves as a subject for understanding complex phase landscapes in hydride systems.
Key Properties
Cross-validated computational properties for H4W, aggregated across 3 databases.
Band GapEnergy needed to move an electron from the valence band to the conduction band. Lower or zero values tend to behave more metallic; larger gaps are more insulating or semiconducting.
Energy Above HullThermodynamic distance from the most stable set of competing phases. 0 eV/atom is on the convex hull; small positive values may still be experimentally accessible.
StabilityA plain-language summary of the best reported energy-above-hull result. It reflects whether the lowest-energy structure is on, near, or far from the stability hull.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Applications
Where H4W is used.
Frequently Asked Questions
Common questions about H4W, answered from cross-validated data.
What is H4W?
H4W is a metastable tungsten hydride compound that exhibits semimetallic electronic behavior.
What is H4W used for?
What is the band gap of H4W?
Is H4W a metal, semiconductor, or insulator?
Is H4W thermodynamically stable?
How many polymorphs of H4W are known?
What elements does H4W contain?
Where does the data for H4W come from?
How It Compares
As a unique hydride phase, H4W represents a distinct point in the compositional space of tungsten-hydrogen systems, serving as a reference for studying the electronic transitions that occur in metal-rich hydrides.
Data sources & attribution
- latticegraph — Lattice Graph Materials Intelligence Platform
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