CsH
cesium hydride · caesium hydride
Cesium hydride is a stable, semiconducting binary compound formed from cesium and hydrogen.
About cesium hydride
Cesium hydride is a binary compound composed of cesium and hydrogen. As a thermodynamically stable member of the alkali metal hydride family, it sits on the convex hull, indicating robust structural integrity under standard conditions.
This material exhibits semiconducting electronic character, distinguishing it from the more metallic nature of its constituent alkali metal. Due to its high reactivity and chemical properties, it is primarily utilized in specialized laboratory research and as a precursor in chemical synthesis.
Key Properties
Cross-validated computational properties for cesium hydride, 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.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of CsH. 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 CsH, 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. |
|---|---|---|---|---|---|
| — | — | 2.38 | 0.0000 | -0.157 | — |
| Fm-3m (No. 225) | cubic | 2.35 | 0.0000 | -14.529 | 3.42 |
| — | — | 2.38 | 0.0001 | -0.156 | — |
| — | — | 2.35 | 0.0011 | -0.155 | — |
| — | — | 2.46 | 0.0012 | -0.155 | — |
| Pm-3m (No. 221) | cubic | 2.57 | 0.0161 | -14.513 | 3.99 |
| — | — | 2.77 | 0.0325 | -0.124 | — |
| — | — | 2.77 | 0.0510 | -0.106 | — |
| — | — | 2.99 | 0.0551 | -0.101 | — |
| — | — | 2.79 | 0.0564 | -0.100 | — |
| Cm (No. 8) | monoclinic | — | — | — | 2.41 |
| P-1 (No. 2) | triclinic | — | — | — | 1.43 |
Applications
Where cesium hydride is used.
Frequently Asked Questions
Common questions about cesium hydride, answered from cross-validated data.
What is CsH?
Cesium hydride is a stable, semiconducting binary compound formed from cesium and hydrogen.
What is CsH used for?
What is the band gap of CsH?
Is CsH a metal, semiconductor, or insulator?
Is CsH thermodynamically stable?
What is the crystal structure of CsH?
What is the density of CsH?
How many polymorphs of CsH are known?
What elements does CsH contain?
Where does the data for CsH come from?
How It Compares
As a stable binary hydride, this compound serves as a fundamental reference point for understanding the bonding and electronic behavior of heavy alkali metal hydrides in solid-state chemistry.
Data sources & attribution
- 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)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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