La2Zr2O7
lanthanum zirconate · LZ
La2Zr2O7 is a stable, insulating oxide ceramic widely used for its exceptional thermal resistance and durability in extreme environments.
About lanthanum zirconate
La2Zr2O7 is a chemically robust oxide that crystallizes in a stable pyrochlore structure. As a wide-gap insulator, it exhibits excellent thermal stability and resistance to phase transitions, making it a highly reliable candidate for demanding high-temperature environments.
Its unique structural properties allow it to serve as an effective host for dopants and radioactive ions. Due to its inherent stability and insulating nature, it is widely utilized in advanced engineering applications where thermal protection and material longevity are paramount.
Key Properties
Cross-validated computational properties for lanthanum zirconate, 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 La2Zr2O7, 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 | 3.73 | 0.0000 | -9.510 | 6.02 |
| Pmma (No. 51) | orthorhombic | 2.23 | 0.2721 | -9.238 | 5.97 |
| Fd-3m (No. 227) | cubic | 0.06 | 0.3828 | -9.127 | 6.12 |
| Fd-3m (No. 227) | Cubic | — | — | — | 5.88 |
| Fd-3m (No. 227) | Cubic | — | — | — | 6.24 |
| Fd-3m (No. 227) | Cubic | — | — | — | 6.03 |
| Fd-3m (No. 227) | — | — | — | — | — |
Applications
Where lanthanum zirconate is used.
Frequently Asked Questions
Common questions about lanthanum zirconate, answered from cross-validated data.
What is La2Zr2O7?
La2Zr2O7 is a stable, insulating oxide ceramic widely used for its exceptional thermal resistance and durability in extreme environments.
What is La2Zr2O7 used for?
What is the band gap of La2Zr2O7?
Is La2Zr2O7 a metal, semiconductor, or insulator?
Is La2Zr2O7 thermodynamically stable?
What is the crystal structure of La2Zr2O7?
What is the density of La2Zr2O7?
How many polymorphs of La2Zr2O7 are known?
What elements does La2Zr2O7 contain?
Where does the data for La2Zr2O7 come from?
How It Compares
Within the perovskite oxides class.
Unlike the transition-metal-rich perovskites such as LaNiO3, LaMnO3, or LaFeO3, which are often characterized by their complex magnetic and electronic properties, La2Zr2O7 is defined by its insulating character and structural stability. While compounds like BaTiO3 are prized for their ferroelectric behavior, La2Zr2O7 is primarily valued for its thermal and chemical inertness, setting it apart from the more electronically active members of the lanthanum-based oxide family.
Related Compounds
Other Perovskite Oxides 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.
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
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