Na2U2O7
sodium diuranate · yellow cake
Sodium diuranate is a stable, semiconducting uranium-based oxide frequently encountered in the industrial processing and refining of uranium.
About sodium diuranate
Sodium diuranate is a thermodynamically stable oxide that occupies a significant position in uranium chemistry. Characterized by its semiconducting electronic nature, this compound represents a robust phase within the sodium-uranium-oxygen system, frequently appearing as a product in the processing of uranium ores. Its structural integrity is well-documented, with numerous reported configurations across scientific databases.
Beyond its fundamental role in inorganic chemistry, this material is historically significant due to its association with the refinement and recovery of uranium. Its stability and distinct chemical properties make it a subject of ongoing interest for researchers studying actinide-based materials and their potential applications in specialized industrial processes.
Key Properties
Cross-validated computational properties for sodium diuranate, 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 Na2U2O7, 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. |
|---|---|---|---|---|---|
| C2/m (No. 12) | monoclinic | 1.56 | 0.0000 | -8.720 | 6.60 |
| P21/c (No. 14) | monoclinic | 1.61 | 0.0013 | -8.719 | 6.27 |
| P21 (No. 4) | monoclinic | 1.60 | 0.0043 | -8.716 | 6.21 |
| P21/m (No. 11) | monoclinic | 1.66 | 0.0046 | -8.715 | 6.58 |
| Pm (No. 6) | monoclinic | 1.56 | 0.0620 | -8.658 | 6.28 |
| C2/m (No. 12) | Monoclinic | — | — | — | 6.25 |
| C2/m (No. 12) | Monoclinic | — | — | — | 6.60 |
| C2/m (No. 12) | Monoclinic | — | — | — | 6.36 |
| Pm (No. 6) | Monoclinic | — | — | — | 6.28 |
| Pm (No. 6) | Monoclinic | — | — | — | 6.62 |
| Pm (No. 6) | Monoclinic | — | — | — | 6.39 |
| P21/m (No. 11) | Monoclinic | — | — | — | 6.31 |
Applications
Where sodium diuranate is used.
Frequently Asked Questions
Common questions about sodium diuranate, answered from cross-validated data.
What is Na2U2O7?
Sodium diuranate is a stable, semiconducting uranium-based oxide frequently encountered in the industrial processing and refining of uranium.
What is Na2U2O7 used for?
What is the band gap of Na2U2O7?
Is Na2U2O7 a metal, semiconductor, or insulator?
Is Na2U2O7 thermodynamically stable?
What is the crystal structure of Na2U2O7?
What is the density of Na2U2O7?
How many polymorphs of Na2U2O7 are known?
What elements does Na2U2O7 contain?
Where does the data for Na2U2O7 come from?
How It Compares
As a primary sodium uranate phase, this compound serves as a critical reference point for understanding the behavior of alkali metal uranates, representing a stable endpoint in the reaction of sodium with uranium-bearing materials.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
Analyze Na2U2O7 in the Lattice Graph platform
Polymorph comparison, confidence scoring, supply-chain risk, and patent monitoring — across 53 integrated data sources.
Explore the Platform →