La2Hf2O7
La2Hf2O7 has a DFT band gap of 4.29 eV across 6 reported structures in 2 space groups; its lowest-energy polymorph is cubic (Fd-3m (No. 227)). Cross-validated across 2 computational databases.
At a glance
Key Properties
Cross-validated computational properties for La2Hf2O7, aggregated across 2 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.
4.29 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)
1 DFT source
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
6
2 databases, 2 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for La2Hf2O7, 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 | 4.29 | 0.0000 | -9.899 | 8.01 |
| P21 (No. 4) | monoclinic | 4.29 | 0.0415 | -9.857 | 7.81 |
| Fd-3m (No. 227) | cubic | 0.00 | 0.4480 | -9.451 | 8.17 |
| Fd-3m (No. 227) | Cubic | — | — | — | 7.86 |
| Fd-3m (No. 227) | Cubic | — | — | — | 8.24 |
| Fd-3m (No. 227) | Cubic | — | — | — | 8.01 |
Reference
Frequently Asked Questions
Common questions about La2Hf2O7, answered from cross-validated data.
What is the band gap of La2Hf2O7?
La2Hf2O7 has a DFT-computed band gap of 4.29 eV across 6 reported structures.
More questions
Is La2Hf2O7 a metal, semiconductor, or insulator?
With a wide band gap up to 4.29 eV it is an insulator / wide-band-gap material.
Is La2Hf2O7 thermodynamically stable?
Yes — La2Hf2O7 sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of La2Hf2O7?
The lowest-energy reported polymorph of La2Hf2O7 is cubic symmetry, space group Fd-3m (No. 227).
What is the density of La2Hf2O7?
The computed density of the ground-state structure of La2Hf2O7 is 8.01 g/cm³.
How many polymorphs of La2Hf2O7 are known?
6 structures of La2Hf2O7 are reported across 2 databases, spanning 2 distinct space groups.
What elements does La2Hf2O7 contain?
La2Hf2O7 contains Hf, La, and O (3 elements).
Where does the data for La2Hf2O7 come from?
La2Hf2O7 data is cross-referenced from materials_project, mpaloe.
Explore
Related Compounds
Other Fluorite Oxide-Ion Conductors in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
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