Gd8O4S8
Gd8O4S8 is a metastable semiconducting oxysulfide compound composed of gadolinium, oxygen, and sulfur.
About Gd8O4S8
Gd8O4S8 is a complex oxysulfide compound characterized by its semiconducting electronic nature. As a metastable phase, it represents a unique arrangement of gadolinium, oxygen, and sulfur atoms that requires specific synthesis conditions to stabilize compared to more common binary oxides or sulfides.
This material is of interest for researchers investigating the intersection of rare-earth chemistry and chalcogenide physics. Its specific stoichiometry and electronic properties make it a subject of study for potential applications in specialized optoelectronic or luminescent systems where rare-earth-based semiconductors are utilized.
Key Properties
Cross-validated computational properties for Gd8O4S8, 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.
Reported Structures
Lowest-energy structures reported for Gd8O4S8, ranked by energy above hull.
| Space GroupSymmetry classification of the crystal arrangement. The number is the international space-group index. | Crystal SystemBroad lattice family, such as cubic, tetragonal, monoclinic, or triclinic, derived from unit-cell symmetry. | Band Gap (eV)Electronic gap calculated for this specific reported structure, measured in electronvolts. | E above hull (eV/atom)Thermodynamic distance from the convex hull for this structure, normalized per atom. Lower is generally more stable. | E/atom (eV)Computed total energy normalized per atom. Use energy above hull, not this value alone, when comparing stability. | Density (g/cm³)Mass per relaxed crystal volume, reported in grams per cubic centimeter. |
|---|---|---|---|---|---|
| P21/c (No. 14) | monoclinic | 1.72 | 0.0796 | -11.217 | 6.55 |
| No. 0 | unknown | — | — | — | 1.65 |
| P21/c (No. 14) | — | — | — | — | — |
Applications
Where Gd8O4S8 is used.
Frequently Asked Questions
Common questions about Gd8O4S8, answered from cross-validated data.
What is Gd8O4S8?
Gd8O4S8 is a metastable semiconducting oxysulfide compound composed of gadolinium, oxygen, and sulfur.
What is Gd8O4S8 used for?
What is the band gap of Gd8O4S8?
Is Gd8O4S8 a metal, semiconductor, or insulator?
Is Gd8O4S8 thermodynamically stable?
What is the crystal structure of Gd8O4S8?
What is the density of Gd8O4S8?
How many polymorphs of Gd8O4S8 are known?
What elements does Gd8O4S8 contain?
Where does the data for Gd8O4S8 come from?
How It Compares
As a unique oxysulfide phase, Gd8O4S8 occupies a distinct niche within the broader landscape of rare-earth chalcogenides. While many gadolinium-based compounds are thermodynamically stable, this material's metastable nature highlights the diversity of structural motifs accessible in the gadolinium-oxygen-sulfur system, serving as an example of the complex chemical space available for exploration beyond standard stable oxides.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
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