Er8O20Si4
Erbium silicate · Erbium orthosilicate
Erbium silicate is a rare-earth metal compound composed of erbium, silicon, and oxygen. It is primarily studied for its optical properties and potential integration into advanced photonic devices and light-emitting technologies.
ErOSi
Overview
Key Properties
Cross-validated computational properties for Erbium silicate, aggregated across 4 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.
4.65–4.76 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.
0.000 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.
On hull (stable)
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
7
4 databases, 3 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for Er8O20Si4, 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/c (No. 15) | monoclinic | 4.76 | 0.0000 | -8.749 | 7.08 |
| P21/c (No. 14) | monoclinic | 4.65 | 0.0254 | -8.724 | 7.58 |
| — | — | — | — | — | 7.25 |
| P21/c (No. 14) | — | — | — | — | — |
| No. 0 | unknown | — | — | — | 0.87 |
| C2/c (No. 15) | — | — | — | — | — |
| — | — | — | — | — | 7.44 |
Uses
Applications
Where Erbium silicate is used.
Optical amplifiersPhotonic integrated circuitsLaser materialsSemiconductor research
Reference
Frequently Asked Questions
Common questions about Erbium silicate, answered from cross-validated data.
What is Er8O20Si4?
Erbium silicate is a rare-earth metal compound composed of erbium, silicon, and oxygen. It is primarily studied for its optical properties and potential integration into advanced photonic devices and light-emitting technologies.
More questions
What is Er8O20Si4 used for?
Erbium silicate (Er8O20Si4) is used in optical amplifiers, photonic integrated circuits, laser materials, and semiconductor research.
What is the band gap of Er8O20Si4?
Erbium silicate (Er8O20Si4) has a DFT-computed band gap of 4.65–4.76 eV across 7 reported structures.
Is Er8O20Si4 a metal, semiconductor, or insulator?
With a wide band gap up to 4.76 eV it is an insulator / wide-band-gap material.
Is Er8O20Si4 thermodynamically stable?
Yes — Erbium silicate (Er8O20Si4) sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of Er8O20Si4?
The lowest-energy reported polymorph of Erbium silicate (Er8O20Si4) is monoclinic symmetry, space group C2/c (No. 15).
What is the density of Er8O20Si4?
The computed density of the ground-state structure of Erbium silicate (Er8O20Si4) is 7.08 g/cm³.
How many polymorphs of Er8O20Si4 are known?
7 structures of Er8O20Si4 are reported across 4 databases, spanning 3 distinct space groups.
What elements does Er8O20Si4 contain?
Erbium silicate (Er8O20Si4) contains Er, O, and Si (3 elements).
Where does the data for Er8O20Si4 come from?
Er8O20Si4 data is cross-referenced from materials_project, omat24, aflow, cod.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
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