Na2CrO4
Sodium chromate · Disodium chromate
Sodium chromate is a stable, insulating inorganic salt composed of sodium, chromium, and oxygen that is widely used in industrial chemical manufacturing.
About Sodium chromate
Sodium chromate is a thermodynamically stable member of the layered sodium transition-metal oxide family. Characterized by its wide-gap insulating electronic structure, this compound represents a well-documented material with multiple known structural configurations reported across scientific databases. Its stability and chemical nature make it a significant subject for structural analysis within the broader class of sodium-based oxides. The material is primarily utilized in industrial processes where chromium chemistry is essential, often serving as a precursor for various pigments, corrosion inhibitors, and chemical synthesis reagents. Its insulating behavior distinguishes it from the more conductive transition-metal oxides often explored for battery electrode applications.
Key Properties
Cross-validated computational properties for Sodium 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 Na2CrO4, 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. |
|---|---|---|---|---|---|
| Cmcm (No. 63) | orthorhombic | 2.87 | 0.0000 | -6.573 | 2.86 |
| R-3 (No. 148) | trigonal | 2.81 | 0.0190 | -6.554 | 2.15 |
| P-1 (No. 2) | triclinic | 3.01 | 0.0283 | -6.545 | 2.18 |
| Cmcm (No. 63) | — | — | — | — | — |
| Cmcm (No. 63) | Orthorhombic | — | — | — | 2.67 |
| Cmcm (No. 63) | Orthorhombic | — | — | — | 2.84 |
| P-1 (No. 2) | Triclinic | — | — | — | 2.22 |
| P-1 (No. 2) | Triclinic | — | — | — | 2.31 |
| P-1 (No. 2) | Triclinic | — | — | — | 2.18 |
| Cmcm (No. 63) | Orthorhombic | — | — | — | 2.73 |
Applications
Where Sodium chromate is used.
Frequently Asked Questions
Common questions about Sodium chromate, answered from cross-validated data.
What is Na2CrO4?
Sodium chromate is a stable, insulating inorganic salt composed of sodium, chromium, and oxygen that is widely used in industrial chemical manufacturing.
What is Na2CrO4 used for?
What is the band gap of Na2CrO4?
Is Na2CrO4 a metal, semiconductor, or insulator?
Is Na2CrO4 thermodynamically stable?
What is the crystal structure of Na2CrO4?
What is the density of Na2CrO4?
How many polymorphs of Na2CrO4 are known?
What elements does Na2CrO4 contain?
Where does the data for Na2CrO4 come from?
How It Compares
Within the layered sodium transition-metal oxides class.
Unlike NaCoO2 or NaNiO2, which are frequently studied for their electrochemical activity and metallic-like conductivity in energy storage devices, Na2CrO4 functions as a stable, insulating oxide. While siblings like Na2TiO3 or Na2FeO3 are often investigated for their potential as cathode materials, Na2CrO4 is defined by its thermodynamic stability and its role as a foundational chemical compound rather than an active battery material.
Related Compounds
Other Layered Sodium Transition-Metal Oxides in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
- mpaloe — Data from mpaloe.
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