_hydride_powder.jpg) | |
| Names | |
|---|---|
| IUPAC name | |
| Other names | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.028.844 |
| EC Number |
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| UNII | |
| |
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| Properties | |
| ZrH2 | |
| Molar mass | 93.240 g/mol |
| Appearance | Greytetragonal crystals or dark gray to black metallic powder[4] |
| Odor | Odorless[5] |
| Density | 5.60 g/cm3 |
| Melting point | 800°C (decomposes) |
| Insoluble[citation needed] | |
| Solubility | Soluble inHF |
| Structure | |
| tetragonal | |
| dihedral (C2v) | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards | Skin irritation, eye irritation, flammable[4] |
| GHS labelling: | |
  | |
| Danger | |
| H228,H315,H319,H335 | |
| P210,P240,P241,P261,P264,P271,P280,P302+P352,P304+P340+P312,P305+P351+P338,P332+P313,P337+P313,P362,P370+P378,P403+P233,P405,P501 | |
| NFPA 704 (fire diamond) | |
| 270 °C | |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Zirconium(II) hydride is a molecularchemical compound with thechemical formulaZrH2. It is a greycrystalline solid or dark gray to black powder.[4] It has been prepared by laser ablation and isolated at low temperature.[6]
Zirconium(II) hydride has repeatedly been the subject ofDirac–Hartree–Fockrelativistic calculation studies, which investigate the stabilities, geometries, and relative energies of hydrides of the formulaMH4,MH3,MH2, or MH.
Zirconium(II) hydride has adihedral (C2v) structure. In zirconium(II) hydride, the formaloxidation states ofzirconium andhydrogen are +2 and −1, respectively, because theelectronegativity of zirconium is lower than that of hydrogen. The stability ofmetal hydrides with the formulaMH2 (M =Ti,Zr,Hf) decreases from Ti to Hf.
Zirconium(II) hydride is used as a thermalneutron moderator innuclear reactors and as a material forneutron reflectors infast reactors.[5]
Zirconium(II) hydride in the form of apowder is used inpowder metallurgy as ahydrogenationcatalyst,vacuum tube getter,foaming agent in the production ofmetal foams and as areducing agent.[5]
