Li2FeP2S6
Li2FeP2S6 has a DFT band gap of 0.63 eV across 2 reported structures in 1 space group; its reference structure is trigonal (P-31m (No. 162)). Cross-validated across 1 computational databases.
At a glance
Key Properties
Cross-validated computational properties for Li2FeP2S6, aggregated across 1 database.
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.
0.63 eV
Range across DFT structures · ground state: narrow gap
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.
0.032 eV/atom
Best (lowest) across sources
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.
Metastable
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
2
1 database, 1 space group
Validation
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of Li2FeP2S6. 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.
0.85 / 1.00
Trust tier: medium
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
0.036 eV
EAH spread across sources
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
2
jarvis, materials_project
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
Mixed (most: P-31m (No. 162))
Crystallography
Reported Structures
Lowest-energy structures reported for Li2FeP2S6, 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. |
|---|---|---|---|---|---|
| P312 (No. 149) | trigonal | 0.00 | 0.0324 | -0.643 | — |
| P312 (No. 149) | trigonal | 0.63 | 0.0429 | -0.632 | — |
| C2 (No. 5) | monoclinic | 0.00 | 0.0688 | -5.200 | 2.57 |
| P312 (No. 149) | trigonal | 0.71 | 0.0817 | -5.187 | 2.76 |
| P-31m (No. 162) | trigonal | — | — | — | 2.62 |
Reference
Frequently Asked Questions
Common questions about Li2FeP2S6, answered from cross-validated data.
What is the band gap of Li2FeP2S6?
Li2FeP2S6 has a DFT-computed band gap of 0.63 eV across 2 reported structures. Standard DFT underestimates band gaps, so the measured gap is typically larger.
More questions
Is Li2FeP2S6 a metal, semiconductor, or insulator?
DFT predicts a band gap of up to 0.63 eV (a semiconductor). Measured gaps are typically larger.
Is Li2FeP2S6 thermodynamically stable?
Li2FeP2S6 has a lowest energy above hull of 0.032 eV/atom (metastable).
What is the crystal structure of Li2FeP2S6?
The reference structure of Li2FeP2S6 is trigonal symmetry, space group P-31m (No. 162).
What is the density of Li2FeP2S6?
The computed density of the ground-state structure of Li2FeP2S6 is 2.62 g/cm³.
How many polymorphs of Li2FeP2S6 are known?
2 structures of Li2FeP2S6 are reported across 1 database, spanning 1 distinct space group.
What elements does Li2FeP2S6 contain?
Li2FeP2S6 contains Fe, Li, P, and S (4 elements).
Where does the data for Li2FeP2S6 come from?
Li2FeP2S6 data is cross-referenced from jarvis, materials_project, cod.
Explore
Related Compounds
Other Sulfide Solid Electrolytes in the database.
Data sources & attribution
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
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