Co2La2
Co2La2 is a metallic intermetallic compound formed from cobalt and lanthanum that exhibits a high degree of structural complexity.
About Co2La2
Co2La2 is a metallic intermetallic compound composed of cobalt and lanthanum. It is characterized by its metallic electronic nature, which is typical for materials combining transition metals with rare-earth elements.
Despite its status as a thermodynamically unstable phase located above the hull, this compound is notable for its high structural diversity. It has been documented with numerous distinct structural arrangements across multiple materials databases, highlighting its complex phase behavior.
Key Properties
Cross-validated computational properties for Co2La2, aggregated across 5 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 Co2La2, 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. |
|---|---|---|---|---|---|
| I213 (No. 199) | cubic | 0.00 | 0.1603 | -21.357 | 7.77 |
| P4/nmm (No. 129) | — | — | — | — | — |
| Pmmn (No. 59) | — | — | — | — | — |
| I41/amd (No. 141) | — | — | — | — | — |
| Cmcm (No. 63) | — | — | — | — | — |
| P-3m1 (No. 164) | — | — | — | — | — |
| R-3m (No. 166) | — | — | — | — | — |
| P4/nmm (No. 129) | — | — | — | — | — |
| C2/m (No. 12) | — | — | — | — | — |
| P21/m (No. 11) | — | — | — | — | — |
| Imma (No. 74) | — | — | — | — | — |
| P4/nmm (No. 129) | — | — | — | — | — |
Frequently Asked Questions
Common questions about Co2La2, answered from cross-validated data.
What is Co2La2?
Co2La2 is a metallic intermetallic compound formed from cobalt and lanthanum that exhibits a high degree of structural complexity.
What is the band gap of Co2La2?
Is Co2La2 a metal, semiconductor, or insulator?
Is Co2La2 thermodynamically stable?
What is the crystal structure of Co2La2?
What is the density of Co2La2?
How many polymorphs of Co2La2 are known?
What elements does Co2La2 contain?
Where does the data for Co2La2 come from?
How It Compares
As a unique intermetallic phase, Co2La2 represents a complex structural system within the cobalt-lanthanum binary space. While it lacks the thermodynamic stability of more common intermetallic phases, its high structural variability makes it a significant subject for researchers studying the formation of metastable phases in rare-earth transition metal alloys.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
- nomad — Data from NOMAD. Cite: Draxl & Scheffler, J. Phys. Mater. 2, 036001 (2019).
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