Na2GeO3
sodium metagermanate · sodium germanate
Sodium metagermanate is a stable, semiconducting inorganic compound composed of sodium, germanium, and oxygen.
About sodium metagermanate
Sodium metagermanate is a stable inorganic compound consisting of sodium, germanium, and oxygen. As a semiconducting material, it occupies a unique position in solid-state chemistry, characterized by its presence on the thermodynamic convex hull, which indicates high stability under standard conditions. Its structural versatility is evidenced by multiple reported configurations across various databases. This compound serves as a critical subject for researchers investigating the electronic and structural behavior of germanate-based materials. By understanding its fundamental properties, scientists can better leverage its semiconducting nature for potential integration into specialized electronic or optical devices.
Key Properties
Cross-validated computational properties for sodium metagermanate, 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 Na2GeO3. 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 Na2GeO3, 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. |
|---|---|---|---|---|---|
| Cmc21 (No. 36) | orthorhombic | 3.13 | 0.0000 | -1.926 | — |
| Cmc21 (No. 36) | orthorhombic | 2.98 | 0.0000 | -5.825 | 3.38 |
| — | — | 3.28 | 0.0019 | -2.040 | — |
| — | — | 3.18 | 0.0647 | -1.977 | — |
| — | — | 3.40 | 0.0974 | -1.944 | — |
| Cmc21 (No. 36) | orthorhombic | — | — | — | 3.35 |
| Cmc21 (No. 36) | orthorhombic | — | — | — | 3.33 |
| Cmc21 (No. 36) | orthorhombic | — | — | — | 3.20 |
| Cmc21 (No. 36) | orthorhombic | — | — | — | 3.37 |
| Cmc21 (No. 36) | orthorhombic | — | — | — | 3.30 |
Synthesis Routes
Literature-extracted synthesis procedures targeting Na2GeO3.
Applications
Where sodium metagermanate is used.
Frequently Asked Questions
Common questions about sodium metagermanate, answered from cross-validated data.
What is Na2GeO3?
Sodium metagermanate is a stable, semiconducting inorganic compound composed of sodium, germanium, and oxygen.
What is Na2GeO3 used for?
What is the band gap of Na2GeO3?
Is Na2GeO3 a metal, semiconductor, or insulator?
Is Na2GeO3 thermodynamically stable?
What is the crystal structure of Na2GeO3?
How many polymorphs of Na2GeO3 are known?
How is Na2GeO3 synthesized?
What elements does Na2GeO3 contain?
Where does the data for Na2GeO3 come from?
How It Compares
As a distinct member of the germanate family, sodium metagermanate represents a fundamental building block for exploring alkali-metal germanate systems. While it exists as a standalone subject in this context, it serves as a primary reference point for understanding how the incorporation of alkali cations into a germanium-oxide framework influences electronic behavior and structural stability within the broader class of germanate materials.
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)
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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