NbP2S8
NbP2S8 has a DFT band gap of 1.25–1.44 eV across 5 reported structures in 2 space groups; its reference structure is orthorhombic (Cmce (No. 64)). Cross-validated across 3 computational databases.
NbPS
At a glance
Key Properties
Cross-validated computational properties for NbP2S8, 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.
1.25–1.44 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.
0.000 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.
Stable
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
5
3 databases, 2 space groups
Validation
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of NbP2S8. 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.
1.00 / 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.
0.000 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.
All match
Crystallography
Reported Structures
Lowest-energy structures reported for NbP2S8, 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. |
|---|---|---|---|---|---|
| Cmce (No. 64) | orthorhombic | 1.28 | 0.0000 | -5.715 | 2.21 |
| Cmce (No. 64) | orthorhombic | 1.25 | 0.0000 | -0.444 | — |
| P-4n2 (No. 118) | tetragonal | 1.44 | 0.0073 | -5.708 | 2.35 |
| Cmce (No. 64) | orthorhombic | — | — | — | 2.42 |
| P-4n2 (No. 118) | tetragonal | — | — | — | 2.61 |
Reference
Frequently Asked Questions
Common questions about NbP2S8, answered from cross-validated data.
What is the band gap of NbP2S8?
NbP2S8 has a DFT-computed band gap of 1.25–1.44 eV across 5 reported structures. Standard DFT underestimates band gaps, so the measured gap is typically larger.
More questions
Is NbP2S8 a metal, semiconductor, or insulator?
DFT predicts a band gap of up to 1.44 eV (a semiconductor). Measured gaps are typically larger.
Is NbP2S8 thermodynamically stable?
Yes — NbP2S8 sits on the convex hull (energy above hull 0 eV/atom), i.e. stable.
What is the crystal structure of NbP2S8?
The reference structure of NbP2S8 is orthorhombic symmetry, space group Cmce (No. 64).
What is the density of NbP2S8?
The computed density of the ground-state structure of NbP2S8 is 2.21 g/cm³.
How many polymorphs of NbP2S8 are known?
5 structures of NbP2S8 are reported across 3 databases, spanning 2 distinct space groups.
What elements does NbP2S8 contain?
NbP2S8 contains Nb, P, and S (3 elements).
Where does the data for NbP2S8 come from?
NbP2S8 data is cross-referenced from materials_project, jarvis, cod.
Data sources & attribution
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- 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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