HfF4
Hafnium(IV) fluoride · Hafnium tetrafluoride
Hafnium(IV) fluoride is an inorganic compound that typically appears as a white crystalline solid. It is primarily utilized as a precursor in the synthesis of specialized optical materials and as a component in fluoride-based glass compositions.
Key Properties
Cross-validated computational properties for Hafnium(IV) fluoride, 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.
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.
Reported Structures
Lowest-energy structures reported for HfF4, 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 | 5.41 | 0.0000 | -15.633 | 7.15 |
| C2/m (No. 12) | Monoclinic | — | — | — | 6.32 |
| P4/mmm (No. 123) | Tetragonal | — | — | — | 5.82 |
| P4/mmm (No. 123) | Tetragonal | — | — | — | 5.98 |
| P-1 (No. 2) | Triclinic | — | — | — | 5.88 |
| Cm (No. 8) | Monoclinic | — | — | — | 5.99 |
| C2 (No. 5) | Monoclinic | — | — | — | 5.55 |
| C2/m (No. 12) | Monoclinic | — | — | — | 10.37 |
| P-1 (No. 2) | Triclinic | — | — | — | 7.15 |
| C2/m (No. 12) | Monoclinic | — | — | — | 8.56 |
| Cm (No. 8) | Monoclinic | — | — | — | 5.23 |
| C2/m (No. 12) | Monoclinic | — | — | — | 6.62 |
Applications
Where Hafnium(IV) fluoride is used.
Frequently Asked Questions
Common questions about Hafnium(IV) fluoride, answered from cross-validated data.
What is HfF4?
Hafnium(IV) fluoride is an inorganic compound that typically appears as a white crystalline solid. It is primarily utilized as a precursor in the synthesis of specialized optical materials and as a component in fluoride-based glass compositions.
What is HfF4 used for?
What is the band gap of HfF4?
Is HfF4 a metal, semiconductor, or insulator?
Is HfF4 thermodynamically stable?
What is the crystal structure of HfF4?
What is the density of HfF4?
How many polymorphs of HfF4 are known?
What elements does HfF4 contain?
Where does the data for HfF4 come from?
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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