Eu2K2P2Se8
Eu2K2P2Se8 is a stable, semimetallic quaternary compound composed of europium, potassium, phosphorus, and selenium.
About Eu2K2P2Se8
Eu2K2P2Se8 is a complex quaternary chalcogenide that stands out for its thermodynamic stability, as it sits directly on the convex hull. This structural robustness makes it a significant subject for researchers investigating the interplay between rare-earth elements and phosphorus-chalcogen frameworks.
Characterized as a near-zero-gap semimetallic material, this compound occupies a unique electronic niche. Its electronic configuration suggests potential utility in specialized semiconductor research where narrow-gap behavior is required for advanced electronic or optoelectronic device development.
Key Properties
Cross-validated computational properties for Eu2K2P2Se8, 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 Eu2K2P2Se8, 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/m (No. 11) | monoclinic | 0.09 | 0.0000 | -5.644 | 4.28 |
| Pnma (No. 62) | orthorhombic | 0.05 | 0.0060 | -5.638 | 4.33 |
| P21/m (No. 11) | — | — | — | — | — |
| — | — | — | — | — | 3.93 |
Applications
Where Eu2K2P2Se8 is used.
Frequently Asked Questions
Common questions about Eu2K2P2Se8, answered from cross-validated data.
What is Eu2K2P2Se8?
Eu2K2P2Se8 is a stable, semimetallic quaternary compound composed of europium, potassium, phosphorus, and selenium.
What is Eu2K2P2Se8 used for?
What is the band gap of Eu2K2P2Se8?
Is Eu2K2P2Se8 a metal, semiconductor, or insulator?
Is Eu2K2P2Se8 thermodynamically stable?
What is the crystal structure of Eu2K2P2Se8?
What is the density of Eu2K2P2Se8?
How many polymorphs of Eu2K2P2Se8 are known?
What elements does Eu2K2P2Se8 contain?
Where does the data for Eu2K2P2Se8 come from?
How It Compares
As a distinct quaternary phase, Eu2K2P2Se8 serves as a foundational example of stability within its chemical family. While many complex chalcogenides struggle with phase separation, this compound maintains a stable configuration, providing a reliable baseline for studying the electronic properties of rare-earth phosphorus selenides.
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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