KNaCl2
KNaCl2 has a DFT band gap of 4.90 eV across 4 reported structures in 1 space group; its reference structure is trigonal (R-3m (No. 166)). Cross-validated across 2 computational databases.
ClKNa
At a glance
Key Properties
Cross-validated computational properties for KNaCl2, aggregated across 2 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.
4.90 eV
Range across DFT structures · ground state: insulator
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.
0.047 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.
Near Hull
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
4
2 databases, 1 space group
Validation
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of KNaCl2. 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.
0.89 / 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.
0.028 eV
EAH spread across sources
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
2
materials_project, oqmd
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
—
Crystallography
Reported Structures
Lowest-energy structures reported for KNaCl2, 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. |
|---|---|---|---|---|---|
| R-3m (No. 166) | trigonal | 4.96 | 0.0186 | -3.698 | 2.11 |
| — | — | 4.90 | 0.0467 | -2.050 | — |
| R-3m (No. 166) | trigonal | — | — | — | 2.01 |
| R-3m (No. 166) | trigonal | — | — | — | 2.09 |
| R-3m (No. 166) | trigonal | — | — | — | 2.06 |
Synthesis
Synthesis Routes
Literature-extracted synthesis procedures targeting KNaCl2.
Sol Gel
Procedure available · ceder_sol_gel
Solid State
Procedure available · ceder_solid_state
Reference
Frequently Asked Questions
Common questions about KNaCl2, answered from cross-validated data.
What is the band gap of KNaCl2?
KNaCl2 has a DFT-computed band gap of 4.90 eV across 4 reported structures. Standard DFT underestimates band gaps, so the measured gap is typically larger.
More questions
Is KNaCl2 a metal, semiconductor, or insulator?
DFT predicts a wide band gap of up to 4.90 eV (an insulator or wide-band-gap material).
Is KNaCl2 thermodynamically stable?
KNaCl2 has a lowest energy above hull of 0.047 eV/atom (near hull).
What is the crystal structure of KNaCl2?
The reference structure of KNaCl2 is trigonal symmetry, space group R-3m (No. 166).
What is the density of KNaCl2?
The computed density of the ground-state structure of KNaCl2 is 2.11 g/cm³.
How many polymorphs of KNaCl2 are known?
4 structures of KNaCl2 are reported across 2 databases, spanning 1 distinct space group.
How is KNaCl2 synthesized?
Literature-reported routes for KNaCl2 include sol gel, solid state (2 procedures documented).
What elements does KNaCl2 contain?
KNaCl2 contains Cl, K, and Na (3 elements).
Where does the data for KNaCl2 come from?
KNaCl2 data is cross-referenced from materials_project, oqmd, mpaloe.
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)
- oqmd — Data from the OQMD (oqmd.org). Cite: Saal et al., JOM 65, 1501 (2013); Kirklin et al., npj Comp. Mater. 1, 15010 (2015). (CC-BY-4.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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