O28Se8Tb8
O28Se8Tb8 is a thermodynamically stable, wide-band-gap insulating compound composed of terbium, selenium, and oxygen.
About O28Se8Tb8
O28Se8Tb8 is a complex inorganic compound characterized by its wide-band-gap insulating electronic profile. As a material that resides on the convex hull, it exhibits significant thermodynamic stability, suggesting robust structural integrity under standard conditions. This stability makes it a compelling subject for fundamental research into rare-earth chalcogenide-oxide systems.
Its unique composition of oxygen, selenium, and terbium positions it within a specialized niche of electronic materials. While research into this specific stoichiometry is ongoing, its insulating nature and stable lattice structure provide a foundation for exploring potential applications in optical or dielectric technologies where stable, wide-gap materials are required.
Key Properties
Cross-validated computational properties for O28Se8Tb8, 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 O28Se8Tb8, 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. |
|---|---|---|---|---|---|
| P42/ncm (No. 138) | tetragonal | 3.33 | 0.0000 | -7.221 | 6.66 |
| P42/ncm (No. 138) | — | — | — | — | — |
| — | — | — | — | — | 6.44 |
Frequently Asked Questions
Common questions about O28Se8Tb8, answered from cross-validated data.
What is O28Se8Tb8?
O28Se8Tb8 is a thermodynamically stable, wide-band-gap insulating compound composed of terbium, selenium, and oxygen.
What is the band gap of O28Se8Tb8?
Is O28Se8Tb8 a metal, semiconductor, or insulator?
Is O28Se8Tb8 thermodynamically stable?
What is the crystal structure of O28Se8Tb8?
What is the density of O28Se8Tb8?
How many polymorphs of O28Se8Tb8 are known?
What elements does O28Se8Tb8 contain?
Where does the data for O28Se8Tb8 come from?
How It Compares
As a distinct member of the rare-earth selenium-oxide family, O28Se8Tb8 represents a stable configuration within its chemical space. Unlike less stable phases that may decompose or transition under ambient conditions, this compound maintains its structural identity, serving as a reliable reference point for understanding the interplay between lanthanide cations and chalcogen-oxygen frameworks.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
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