K2WO4
Potassium tungstate · Dipotassium tungstate
Potassium tungstate is a stable, insulating inorganic salt frequently utilized as a chemical precursor and reagent in industrial and laboratory applications.
About Potassium tungstate
Potassium tungstate is a thermodynamically stable inorganic compound characterized by its insulating electronic nature. As a robust member of the tungstate family, it maintains structural integrity under standard conditions and serves as a vital precursor in materials science research. Its ability to remain stable on the convex hull makes it a reliable candidate for various solid-state chemical processes.
Beyond its fundamental stability, this compound is recognized for its utility in synthetic chemistry and as a component in specialized coatings. Its wide-gap electronic profile ensures it remains chemically inert in many environments, facilitating its use in high-temperature applications and as a source of tungsten in complex oxide synthesis.
Key Properties
Cross-validated computational properties for Potassium tungstate, 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.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of K2WO4. 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 K2WO4, 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. |
|---|---|---|---|---|---|
| — | — | 4.85 | 0.0000 | -2.436 | — |
| C2/m (No. 12) | monoclinic | 4.39 | 0.0000 | -7.258 | 4.22 |
| C2/m (No. 12) | monoclinic | 1.92 | 0.0000 | -2.300 | — |
| P21/c (No. 14) | monoclinic | 2.03 | 0.0088 | -2.291 | — |
| P21/c (No. 14) | monoclinic | 4.50 | 0.0173 | -7.241 | 3.98 |
| — | — | 4.95 | 0.0183 | -2.418 | — |
| — | — | 5.35 | 0.0321 | -2.404 | — |
| C2/m (No. 12) | monoclinic | — | — | — | 4.21 |
| C2/m (No. 12) | monoclinic | — | — | — | 4.05 |
| C2/m (No. 12) | monoclinic | — | — | — | 3.95 |
| C2/m (No. 12) | monoclinic | — | — | — | 4.33 |
| P21/c (No. 14) | monoclinic | — | — | — | 3.78 |
Synthesis Routes
Literature-extracted synthesis procedures targeting K2WO4.
Applications
Where Potassium tungstate is used.
Frequently Asked Questions
Common questions about Potassium tungstate, answered from cross-validated data.
What is K2WO4?
Potassium tungstate is a stable, insulating inorganic salt frequently utilized as a chemical precursor and reagent in industrial and laboratory applications.
What is K2WO4 used for?
What is the band gap of K2WO4?
Is K2WO4 a metal, semiconductor, or insulator?
Is K2WO4 thermodynamically stable?
What is the crystal structure of K2WO4?
What is the density of K2WO4?
How many polymorphs of K2WO4 are known?
How is K2WO4 synthesized?
What elements does K2WO4 contain?
Where does the data for K2WO4 come from?
How It Compares
As a standalone representative of its class, potassium tungstate serves as a benchmark for stability and structural predictability among alkali metal tungstates, providing a foundational reference point for researchers studying similar complex oxide systems.
Data sources & attribution
- 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)
- 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)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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