FeP2
Iron diphosphide · Iron(II) phosphide
Iron diphosphide is a binary inorganic compound composed of iron and phosphorus. It is primarily investigated for its potential as an electrode material in advanced battery technologies due to its electrochemical properties.
Key Properties
Cross-validated computational properties for Iron diphosphide, aggregated across 6 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.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of FeP2. Tight agreement means computed properties can be trusted without re-running calculations.
Agreement ScoreA normalized confidence score summarizing how closely independent DFT databases agree. Higher scores mean tighter cross-source agreement.
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
Reported Structures
Lowest-energy structures reported for FeP2, 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. |
|---|---|---|---|---|---|
| Pnnm (No. 58) | orthorhombic | 0.43 | 0.0000 | -6.969 | 5.21 |
| Cm (No. 8) | Monoclinic | — | — | — | 2.38 |
| C2/m (No. 12) | Monoclinic | — | — | — | 5.02 |
| — | — | — | — | — | 5.25 |
| — | — | — | — | — | 5.22 |
| Cm (No. 8) | Monoclinic | — | — | — | 6.05 |
| Cmcm (No. 63) | Orthorhombic | — | — | — | 3.68 |
| P-1 (No. 2) | Triclinic | — | — | — | 4.31 |
| P-1 (No. 2) | Triclinic | — | — | — | 5.75 |
| Pnnm (No. 58) | Orthorhombic | — | — | — | 5.21 |
| P-1 (No. 2) | Triclinic | — | — | — | 4.61 |
| Pnnm (No. 58) | Orthorhombic | — | — | — | 5.31 |
Applications
Where Iron diphosphide is used.
Frequently Asked Questions
Common questions about Iron diphosphide, answered from cross-validated data.
What is FeP2?
Iron diphosphide is a binary inorganic compound composed of iron and phosphorus. It is primarily investigated for its potential as an electrode material in advanced battery technologies due to its electrochemical properties.
What is FeP2 used for?
What is the band gap of FeP2?
Is FeP2 a metal, semiconductor, or insulator?
Is FeP2 thermodynamically stable?
What is the crystal structure of FeP2?
What is the density of FeP2?
How many polymorphs of FeP2 are known?
What elements does FeP2 contain?
Where does the data for FeP2 come from?
Related Compounds
Other Transition-Metal Phosphide Catalysts in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
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