KPd2O3
KPd2O3 is a stable, semiconducting ternary oxide containing potassium, palladium, and oxygen.
About KPd2O3
KPd2O3 is a ternary oxide composed of potassium, palladium, and oxygen. As a thermodynamically stable compound residing on the convex hull, it represents a well-defined phase within its chemical system, offering a reliable structural foundation for experimental investigation.
This material exhibits semiconducting electronic character, making it a subject of interest for researchers studying the intersection of noble metal chemistry and oxide semiconductors. Its existence across multiple structural databases underscores its significance as a stable, reproducible phase in materials science.
Key Properties
Cross-validated computational properties for KPd2O3, 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.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of KPd2O3. Tight agreement means computed properties can be trusted without re-running calculations.
Agreement ScoreA normalized confidence score summarizing how closely independent DFT databases agree. Higher scores mean tighter cross-source agreement.
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
Reported Structures
Lowest-energy structures reported for KPd2O3, 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. |
|---|---|---|---|---|---|
| R-3m (No. 166) | trigonal | 0.48 | 0.0000 | -5.524 | 4.99 |
| R-3m (No. 166) | trigonal | 0.40 | 0.0000 | -0.941 | — |
| — | — | 0.40 | 0.0000 | -0.998 | — |
| R-3m (No. 166) | trigonal | — | — | — | 4.98 |
| R-3m (No. 166) | trigonal | — | — | — | 5.11 |
| R-3m (No. 166) | trigonal | — | — | — | 4.78 |
| R-3m (No. 166) | trigonal | — | — | — | 4.95 |
Applications
Where KPd2O3 is used.
Frequently Asked Questions
Common questions about KPd2O3, answered from cross-validated data.
What is KPd2O3?
KPd2O3 is a stable, semiconducting ternary oxide containing potassium, palladium, and oxygen.
What is KPd2O3 used for?
What is the band gap of KPd2O3?
Is KPd2O3 a metal, semiconductor, or insulator?
Is KPd2O3 thermodynamically stable?
What is the crystal structure of KPd2O3?
What is the density of KPd2O3?
How many polymorphs of KPd2O3 are known?
What elements does KPd2O3 contain?
Where does the data for KPd2O3 come from?
How It Compares
As a distinct ternary oxide, KPd2O3 serves as a foundational example of how alkali metals can stabilize palladium-based oxygen frameworks. Without direct structural siblings in this specific class, it stands as a unique reference point for understanding the electronic and thermodynamic behavior of potassium-palladium oxides.
Data sources & attribution
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- oqmd — Data from the OQMD (oqmd.org). Cite: Saal et al., JOM 65, 1501 (2013); Kirklin et al., npj Comp. Mater. 1, 15010 (2015). (CC-BY-4.0)
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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