SrO4
SrO4 is a semiconducting strontium oxide phase that exhibits structural complexity and is generally considered to be thermodynamically unstable.
About SrO4
SrO4 is a strontium-oxygen compound characterized by its semiconducting electronic nature. As a complex oxide phase, it represents a specific arrangement of strontium and oxygen atoms that has been documented across various structural configurations in materials databases.
Due to its position above the thermodynamic hull, this compound is considered metastable or unstable under standard conditions. Its existence is primarily of interest in fundamental materials research, where understanding the formation and structural diversity of high-oxygen strontium phases remains a key objective.
Key Properties
Cross-validated computational properties for SrO4, 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 SrO4, 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. |
|---|---|---|---|---|---|
| P4/mmm (No. 123) | tetragonal | 0.30 | 0.8832 | -4.736 | 0.24 |
| C2/m (No. 12) | Monoclinic | — | — | — | 3.87 |
| C2/m (No. 12) | Monoclinic | — | — | — | 3.97 |
| C2/m (No. 12) | Monoclinic | — | — | — | 4.01 |
| C2/m (No. 12) | Monoclinic | — | — | — | 3.65 |
| P-43m (No. 215) | Cubic | — | — | — | 1.76 |
| C2 (No. 5) | Monoclinic | — | — | — | 3.21 |
| C2 (No. 5) | Monoclinic | — | — | — | 3.47 |
| P-1 (No. 2) | Triclinic | — | — | — | 1.68 |
| P-43m (No. 215) | Cubic | — | — | — | 1.80 |
| Cm (No. 8) | Monoclinic | — | — | — | 1.94 |
| P1 (No. 1) | Triclinic | — | — | — | 3.89 |
Frequently Asked Questions
Common questions about SrO4, answered from cross-validated data.
What is SrO4?
SrO4 is a semiconducting strontium oxide phase that exhibits structural complexity and is generally considered to be thermodynamically unstable.
What is the band gap of SrO4?
Is SrO4 a metal, semiconductor, or insulator?
Is SrO4 thermodynamically stable?
What is the crystal structure of SrO4?
What is the density of SrO4?
How many polymorphs of SrO4 are known?
What elements does SrO4 contain?
Where does the data for SrO4 come from?
How It Compares
As a unique strontium-oxygen stoichiometry, this compound serves as a distinct point of study within the broader landscape of alkaline earth oxides, representing a specialized phase that differs significantly from the more common and highly stable binary oxides found in the same elemental family.
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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