GeSb2Te4
GeSb2Te4 has a DFT band gap of 0.18–0.34 eV across 7 reported structures in 3 space groups; its reference structure is trigonal (R-3m (No. 166)). Cross-validated across 3 computational databases.
At a glance
Key Properties
Cross-validated computational properties for GeSb2Te4, 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.
0.18–0.34 eV
Range across DFT structures · ground state: small gap
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.
0.001 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.
Stable
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
7
3 databases, 3 space groups
Validation
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of GeSb2Te4. 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.
0.97 / 1.00
Trust tier: medium
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
0.007 eV
EAH spread across sources
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
2
jarvis, materials_project
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
All match
Crystallography
Reported Structures
Lowest-energy structures reported for GeSb2Te4, 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. |
|---|---|---|---|---|---|
| R3m (No. 160) | trigonal | 0.34 | 0.0005 | -0.125 | — |
| R3m (No. 160) | trigonal | 0.24 | 0.0072 | -3.989 | 6.14 |
| R3m (No. 160) | trigonal | 0.18 | 0.0107 | -3.986 | 5.82 |
| R-3m (No. 166) | trigonal | 0.00 | 0.1133 | -0.012 | — |
| I-4m2 (No. 119) | tetragonal | 0.00 | 0.1189 | -3.878 | 6.06 |
| R-3m (No. 166) | trigonal | 0.00 | 0.1261 | -3.871 | 6.42 |
| R-3m (No. 166) | trigonal | — | — | — | 6.61 |
Reference
Frequently Asked Questions
Common questions about GeSb2Te4, answered from cross-validated data.
What is the band gap of GeSb2Te4?
GeSb2Te4 has a DFT-computed band gap of 0.18–0.34 eV across 7 reported structures. Standard DFT underestimates band gaps, so the measured gap is typically larger.
More questions
Is GeSb2Te4 a metal, semiconductor, or insulator?
DFT predicts a band gap of up to 0.34 eV (a semiconductor). Measured gaps are typically larger.
Is GeSb2Te4 thermodynamically stable?
Yes — GeSb2Te4 sits on the convex hull (energy above hull 0 eV/atom), i.e. stable.
What is the crystal structure of GeSb2Te4?
The reference structure of GeSb2Te4 is trigonal symmetry, space group R-3m (No. 166).
How many polymorphs of GeSb2Te4 are known?
7 structures of GeSb2Te4 are reported across 3 databases, spanning 3 distinct space groups.
What elements does GeSb2Te4 contain?
GeSb2Te4 contains Ge, Sb, and Te (3 elements).
Where does the data for GeSb2Te4 come from?
GeSb2Te4 data is cross-referenced from jarvis, materials_project, cod.
Explore
Related Compounds
Other Phase-Change Memory Materials 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)
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
Analyze GeSb2Te4 in the Lattice Graph platform
Polymorph comparison, confidence scoring, supply-chain risk, and patent monitoring — across 85 source databases.
Explore the Platform →