Ho3TaO7
Ho3TaO7 is a stable, insulating holmium tantalum oxide used in materials science research.
About Ho3TaO7
Ho3TaO7 is a complex oxide composed of holmium, tantalum, and oxygen. As a thermodynamically stable phase located on the convex hull, it demonstrates robust structural integrity under standard conditions. Its insulating electronic character makes it a subject of interest for dielectric and optical research applications. The compound exhibits significant structural diversity, with multiple reported configurations documented across materials databases. This structural flexibility suggests potential for fine-tuning its physical properties for specialized technological needs.
Key Properties
Cross-validated computational properties for Ho3TaO7, 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 Ho3TaO7, 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. |
|---|---|---|---|---|---|
| C2221 (No. 20) | orthorhombic | 3.45 | 0.0000 | -9.352 | 9.07 |
| Pc (No. 7) | monoclinic | 3.54 | 0.1297 | -9.223 | 8.66 |
| Cmme (No. 67) | orthorhombic | 2.01 | 0.2469 | -9.105 | 9.12 |
| C2221 (No. 20) | — | — | — | — | — |
| Cmme (No. 67) | — | — | — | — | — |
| C2221 (No. 20) | Orthorhombic | — | — | — | 8.84 |
| C2221 (No. 20) | Orthorhombic | — | — | — | 8.98 |
| C2221 (No. 20) | Orthorhombic | — | — | — | 9.21 |
Applications
Where Ho3TaO7 is used.
Frequently Asked Questions
Common questions about Ho3TaO7, answered from cross-validated data.
What is Ho3TaO7?
Ho3TaO7 is a stable, insulating holmium tantalum oxide used in materials science research.
What is Ho3TaO7 used for?
What is the band gap of Ho3TaO7?
Is Ho3TaO7 a metal, semiconductor, or insulator?
Is Ho3TaO7 thermodynamically stable?
What is the crystal structure of Ho3TaO7?
What is the density of Ho3TaO7?
How many polymorphs of Ho3TaO7 are known?
What elements does Ho3TaO7 contain?
Where does the data for Ho3TaO7 come from?
How It Compares
As a distinct ternary oxide, Ho3TaO7 serves as a representative example of stable rare-earth tantalate phases. While it currently stands as a singular entry in this context, it contributes to the broader understanding of how lanthanide elements stabilize complex tantalum-based frameworks, offering a baseline for evaluating the stability and insulating behavior of similar high-performance ceramic materials.
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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