Na4GeO4
Na4GeO4 is a thermodynamically stable semiconducting oxide compound composed of sodium, germanium, and oxygen.
About Na4GeO4
Na4GeO4 is a sodium-based germanate oxide characterized by its semiconducting electronic nature. As a thermodynamically stable phase residing on the convex hull, it represents a robust structural arrangement within the sodium-germanium-oxygen system.
Its significance lies in its stable configuration, which makes it a subject of interest for researchers investigating ion-conducting materials and solid-state chemistry. The compound is documented across multiple structural databases, reflecting its well-defined crystalline identity.
Key Properties
Cross-validated computational properties for Na4GeO4, 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 Na4GeO4. 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 Na4GeO4, 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. |
|---|---|---|---|---|---|
| — | — | 3.08 | 0.0000 | -1.948 | — |
| P-1 (No. 2) | triclinic | 3.02 | 0.0000 | -1.870 | — |
| P-1 (No. 2) | triclinic | 2.82 | 0.0000 | -5.318 | 3.16 |
| — | — | 2.86 | 0.0264 | -1.921 | — |
| — | — | 2.95 | 0.0536 | -1.894 | — |
| P-1 (No. 2) | triclinic | — | — | — | 2.99 |
| P-1 (No. 2) | triclinic | — | — | — | 3.14 |
| P-1 (No. 2) | triclinic | — | — | — | 3.09 |
Applications
Where Na4GeO4 is used.
Frequently Asked Questions
Common questions about Na4GeO4, answered from cross-validated data.
What is Na4GeO4?
Na4GeO4 is a thermodynamically stable semiconducting oxide compound composed of sodium, germanium, and oxygen.
What is Na4GeO4 used for?
What is the band gap of Na4GeO4?
Is Na4GeO4 a metal, semiconductor, or insulator?
Is Na4GeO4 thermodynamically stable?
What is the crystal structure of Na4GeO4?
How many polymorphs of Na4GeO4 are known?
What elements does Na4GeO4 contain?
Where does the data for Na4GeO4 come from?
How It Compares
As a stable member of the germanate family, Na4GeO4 occupies a distinct position due to its specific stoichiometry and electronic behavior, serving as a foundational reference point for studying the broader landscape of sodium-rich oxide semiconductors.
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)
- 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)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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