K2CrO4
Potassium chromate · Dipotassium chromate
Potassium chromate is a stable, insulating salt primarily utilized as a chemical reagent and industrial corrosion inhibitor.
About Potassium chromate
Potassium chromate is a distinct inorganic compound characterized by its insulating electronic nature and high thermodynamic stability. Its presence on the convex hull ensures structural reliability, making it a robust candidate for various industrial and laboratory chemical processes. The compound is widely recognized for its utility in analytical chemistry and as a precursor in the synthesis of diverse chromium-based materials. Its stable crystalline framework supports its role as a reliable reagent in oxidation-reduction reactions and industrial surface treatments.
Key Properties
Cross-validated computational properties for Potassium chromate, 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.
Reported Structures
Lowest-energy structures reported for K2CrO4, 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. |
|---|---|---|---|---|---|
| P21/c (No. 14) | monoclinic | 3.28 | 0.0000 | -6.589 | 2.78 |
| Pnma (No. 62) | orthorhombic | 3.07 | 0.0004 | -6.588 | 2.79 |
| P21/c (No. 14) | monoclinic | 3.14 | 0.0161 | -6.573 | 2.50 |
| Pnma (No. 62) | Orthorhombic | — | — | — | 2.59 |
| Pnma (No. 62) | Orthorhombic | — | — | — | 2.76 |
| Pnma (No. 62) | Orthorhombic | — | — | — | 2.64 |
| P21/c (No. 14) | Monoclinic | — | — | — | 2.65 |
| I-42m (No. 121) | tetragonal | — | — | — | 1.89 |
| P21/c (No. 14) | Monoclinic | — | — | — | 2.50 |
| P21/c (No. 14) | Monoclinic | — | — | — | 2.55 |
Applications
Where Potassium chromate is used.
Frequently Asked Questions
Common questions about Potassium chromate, answered from cross-validated data.
What is K2CrO4?
Potassium chromate is a stable, insulating salt primarily utilized as a chemical reagent and industrial corrosion inhibitor.
What is K2CrO4 used for?
What is the band gap of K2CrO4?
Is K2CrO4 a metal, semiconductor, or insulator?
Is K2CrO4 thermodynamically stable?
What is the crystal structure of K2CrO4?
What is the density of K2CrO4?
How many polymorphs of K2CrO4 are known?
What elements does K2CrO4 contain?
Where does the data for K2CrO4 come from?
How It Compares
As a prominent chromate salt, this compound serves as a foundational reference point for the study of alkali metal chromates, demonstrating significant thermodynamic stability compared to more reactive or less structurally consistent chemical analogs.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
Analyze K2CrO4 in the Lattice Graph platform
Polymorph comparison, confidence scoring, supply-chain risk, and patent monitoring — across 53 integrated data sources.
Explore the Platform →