CrSO4
Chromium(II) sulfate · Chromous sulfate
Chromium(II) sulfate is a metastable, semiconducting inorganic compound featuring chromium and sulfate ions.
About Chromium(II) sulfate
Chromium(II) sulfate is a semiconducting inorganic compound that exists as a metastable phase. Its chemical identity is defined by the interaction of chromium cations with the sulfate anion, resulting in a material that is of significant interest for fundamental solid-state research. Because it is metastable, it requires specific synthesis conditions to isolate and stabilize its crystalline form.
The compound is characterized by its electronic semiconducting behavior, which distinguishes it from more common insulating sulfate salts. Its structural diversity is highlighted by multiple reported configurations across various databases, making it a subject of ongoing investigation for those studying transition metal sulfates and their potential for specialized chemical applications.
Key Properties
Cross-validated computational properties for Chromium(II) sulfate, 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.
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 CrSO4, 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. |
|---|---|---|---|---|---|
| Pnma (No. 62) | orthorhombic | 2.44 | 0.0460 | -7.579 | 3.21 |
| Pbca (No. 61) | orthorhombic | 0.00 | 0.0590 | -7.013 | 3.58 |
| R3 (No. 146) | trigonal | 0.00 | 0.0598 | -7.012 | 2.99 |
| Cmcm (No. 63) | orthorhombic | 0.00 | 0.0610 | -7.564 | 3.24 |
| R3 (No. 146) | trigonal | 0.00 | 0.0651 | -7.007 | 3.06 |
| C2/c (No. 15) | — | — | — | — | — |
| Cm (No. 8) | Monoclinic | — | — | — | 3.14 |
| Amm2 (No. 38) | Orthorhombic | — | — | — | 5.80 |
| Cm (No. 8) | Monoclinic | — | — | — | 3.94 |
Applications
Where Chromium(II) sulfate is used.
Frequently Asked Questions
Common questions about Chromium(II) sulfate, answered from cross-validated data.
What is CrSO4?
Chromium(II) sulfate is a metastable, semiconducting inorganic compound featuring chromium and sulfate ions.
What is CrSO4 used for?
What is the band gap of CrSO4?
Is CrSO4 a metal, semiconductor, or insulator?
Is CrSO4 thermodynamically stable?
What is the crystal structure of CrSO4?
What is the density of CrSO4?
How many polymorphs of CrSO4 are known?
What elements does CrSO4 contain?
Where does the data for CrSO4 come from?
How It Compares
As a member of the transition metal sulfate family, this compound occupies a unique position due to its specific electronic character and metastable nature, which differentiates it from more thermodynamically stable sulfate minerals that are commonly found in geological environments.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
- mpaloe — Data from mpaloe.
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