Mg18O36W18
Magnesium tungstate · Magnesium wolframate
Magnesium tungstate is an inorganic compound that typically appears as a white crystalline powder. It is widely recognized for its luminescent properties and is frequently utilized in lighting technologies and diagnostic imaging equipment.
MgOW
Overview
Key Properties
Cross-validated computational properties for Magnesium tungstate, 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.
0.25–1.21 eV
Range across DFT structures
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.
0.289 eV/atom
Best (lowest) across sources
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.
Above hull
1 DFT source
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
24
3 databases, 13 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for Mg18O36W18, 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. |
|---|---|---|---|---|---|
| Fd-3m (No. 227) | cubic | 1.21 | 0.2892 | -8.670 | 7.52 |
| P1 (No. 1) | triclinic | 0.82 | 0.3133 | -8.967 | 6.90 |
| Cm (No. 8) | monoclinic | 0.74 | 0.3249 | -8.634 | 7.54 |
| P1 (No. 1) | triclinic | 0.66 | 0.3558 | -8.603 | 7.58 |
| Cm (No. 8) | monoclinic | 1.04 | 0.3953 | -8.564 | 8.58 |
| R-3m (No. 166) | trigonal | 0.00 | 0.3980 | -8.882 | 7.26 |
| Cmcm (No. 63) | orthorhombic | 0.91 | 0.4093 | -8.550 | 8.19 |
| Pnma (No. 62) | orthorhombic | 0.95 | 0.4102 | -8.549 | 8.21 |
| Cm (No. 8) | monoclinic | 0.81 | 0.4256 | -8.533 | 7.66 |
| C2/m (No. 12) | monoclinic | 0.35 | 0.4411 | -8.518 | 7.25 |
| Pmmn (No. 59) | orthorhombic | 0.92 | 0.4716 | -8.487 | 7.35 |
| Imma (No. 74) | orthorhombic | 0.25 | 0.4867 | -8.472 | 7.66 |
Uses
Applications
Where Magnesium tungstate is used.
Phosphors for fluorescent lightingX-ray intensifying screensLuminescent materialsCatalysis
Reference
Frequently Asked Questions
Common questions about Magnesium tungstate, answered from cross-validated data.
What is Mg18O36W18?
Magnesium tungstate is an inorganic compound that typically appears as a white crystalline powder. It is widely recognized for its luminescent properties and is frequently utilized in lighting technologies and diagnostic imaging equipment.
More questions
What is Mg18O36W18 used for?
Magnesium tungstate (Mg18O36W18) is used in phosphors for fluorescent lighting, x-ray intensifying screens, luminescent materials, and catalysis.
What is the band gap of Mg18O36W18?
Magnesium tungstate (Mg18O36W18) has a DFT-computed band gap of 0.25–1.21 eV across 24 reported structures.
Is Mg18O36W18 a metal, semiconductor, or insulator?
With a band gap up to 1.21 eV it is a semiconductor.
Is Mg18O36W18 thermodynamically stable?
Magnesium tungstate (Mg18O36W18) has a lowest energy above hull of 0.289 eV/atom (above hull).
What is the crystal structure of Mg18O36W18?
The lowest-energy reported polymorph of Magnesium tungstate (Mg18O36W18) is cubic symmetry, space group Fd-3m (No. 227).
What is the density of Mg18O36W18?
The computed density of the ground-state structure of Magnesium tungstate (Mg18O36W18) is 7.52 g/cm³.
How many polymorphs of Mg18O36W18 are known?
24 structures of Mg18O36W18 are reported across 3 databases, spanning 13 distinct space groups.
What elements does Mg18O36W18 contain?
Magnesium tungstate (Mg18O36W18) contains Mg, O, and W (3 elements).
Where does the data for Mg18O36W18 come from?
Mg18O36W18 data is cross-referenced from materials_project, cod, omat24.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
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