Na2MnO4
sodium manganate · sodium manganate(VI)
Na2MnO4 is a metastable, metallic layered sodium transition-metal oxide used primarily in research for electrochemical energy storage.
About sodium manganate
Na2MnO4 is a member of the layered sodium transition-metal oxide family, characterized by its metallic electronic nature. As a metastable compound, it represents a complex phase within the manganese-based oxide system, offering unique structural arrangements for ion mobility and electrochemical studies.
This material is of significant interest in materials science due to its potential as a cathode candidate or precursor in sodium-ion battery research. Its metallic behavior distinguishes it from many insulating oxide counterparts, making it a subject of investigation for high-conductivity electrode applications.
Key Properties
Cross-validated computational properties for sodium manganate, 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 Na2MnO4. 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 Na2MnO4, 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. |
|---|---|---|---|---|---|
| P63mc (No. 186) | hexagonal | 0.00 | 0.0000 | -1.716 | — |
| P63mc (No. 186) | hexagonal | 0.00 | 0.0838 | -6.079 | 2.70 |
| — | — | 0.72 | 0.0884 | -1.567 | — |
| — | — | 0.00 | 0.1217 | -1.534 | — |
| — | — | 0.00 | 0.1684 | -1.487 | — |
| P63mc (No. 186) | hexagonal | — | — | — | 2.70 |
| P63mc (No. 186) | hexagonal | — | — | — | 2.16 |
| P63mc (No. 186) | hexagonal | — | — | — | 2.88 |
| P63mc (No. 186) | hexagonal | — | — | — | 2.76 |
Synthesis Routes
Literature-extracted synthesis procedures targeting Na2MnO4.
Applications
Where sodium manganate is used.
Frequently Asked Questions
Common questions about sodium manganate, answered from cross-validated data.
What is Na2MnO4?
Na2MnO4 is a metastable, metallic layered sodium transition-metal oxide used primarily in research for electrochemical energy storage.
What is Na2MnO4 used for?
What is the band gap of Na2MnO4?
Is Na2MnO4 a metal, semiconductor, or insulator?
Is Na2MnO4 thermodynamically stable?
What is the crystal structure of Na2MnO4?
How many polymorphs of Na2MnO4 are known?
How is Na2MnO4 synthesized?
What elements does Na2MnO4 contain?
Where does the data for Na2MnO4 come from?
How It Compares
Within the layered sodium transition-metal oxides class.
Within the broader class of layered sodium transition-metal oxides, Na2MnO4 occupies a distinct position compared to more stable, widely utilized members like NaCoO2 or NaMnO2. While many of its siblings are primarily studied for their intercalation properties in battery systems, the metastable nature of Na2MnO4 presents unique synthesis challenges and opportunities for exploring phase transitions that are not present in the more thermodynamically robust members of the group.
Related Compounds
Other Layered Sodium Transition-Metal Oxides in the database.
Data sources & attribution
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- 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.
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
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