Chemistry:Zirconium(II) hydride

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Zirconium(II) hydride[1]
Zirconium(II) hydride powder.jpg
Names
IUPAC name
Zirconium(II) hydride[2][3]
Other names
  • Hydride;zirconium(2+)[2]
  • Zirconium(2+) dihydride[2][3]
  • Zirconium dihydride[2][3]
Identifiers
3D model (JSmol)
ChemSpider
EC Number
  • 231-727-3
RTECS number
UNII
Properties
ZrH
2
Molar mass 93.240 g/mol
Appearance Grey tetragonal crystals or dark gray to black metallic powder[4][5]
Odor Odorless[4]
Density 5.60 g/cm3
Melting point 800°C (decomposes)
Insoluble[5]
Solubility Soluble in HF
Structure
tetragonal
dihedral (C2v)
Hazards
Main hazards Skin irritation, eye irritation, flammable[5]
GHS pictograms GHS02: FlammableGHS07: Harmful
GHS Signal word Danger
HH228Script error: No such module "Preview warning".Category:GHS errors, HH315Script error: No such module "Preview warning".Category:GHS errors, HH319Script error: No such module "Preview warning".Category:GHS errors, HH335Script error: No such module "Preview warning".Category:GHS errors
PP210Script error: No such module "Preview warning".Category:GHS errors, PP240Script error: No such module "Preview warning".Category:GHS errors, PP241Script error: No such module "Preview warning".Category:GHS errors, PP261Script error: No such module "Preview warning".Category:GHS errors, PP264Script error: No such module "Preview warning".Category:GHS errors, PP271Script error: No such module "Preview warning".Category:GHS errors, PP280Script error: No such module "Preview warning".Category:GHS errors, PP302+P352Script error: No such module "Preview warning".Category:GHS errors, PP304+P340+P312Script error: No such module "Preview warning".Category:GHS errors, PP305+P351+P338Script error: No such module "Preview warning".Category:GHS errors, PP332+P313Script error: No such module "Preview warning".Category:GHS errors, PP337+P313Script error: No such module "Preview warning".Category:GHS errors, PP362Script error: No such module "Preview warning".Category:GHS errors, PP370+P378Script error: No such module "Preview warning".Category:GHS errors, PP403+P233Script error: No such module "Preview warning".Category:GHS errors, PP405Script error: No such module "Preview warning".Category:GHS errors, PP501Script error: No such module "Preview warning".Category:GHS errors
NFPA 704 (fire diamond)
Flammability code 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g. gasolineHealth code 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineReactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no codeNFPA 704 four-colored diamond
3
1
1
270 °C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☑Y verify (what is ☑Y☒N ?)
Infobox references

Zirconium(II) hydride is a molecular chemical compound with the chemical formula ZrH
2. It is a grey crystalline solid or dark gray to black powder.[4][5] It has been prepared by laser ablation and isolated at low temperature.[6]

Zirconium(II) hydride has repeatedly been the subject of Dirac–Hartree–Fock relativistic calculation studies, which investigate the stabilities, geometries, and relative energies of hydrides of the formula MH
4, MH
3, MH
2, or MH.

Zirconium(II) hydride has a dihedral (C2v) structure. In zirconium(II) hydride, the formal oxidation states of zirconium and hydrogen are +2 and −1, respectively, because the electronegativity of zirconium is lower than that of hydrogen. The stability of metal hydrides with the formula MH
2 (M = Ti, Zr, Hf) decreases from Ti to Hf.

Uses

Zirconium(II) hydride is used as a thermal neutron moderator in nuclear reactors and as a material for neutron reflectors in fast reactors.[4]

Zirconium(II) hydride in the form of a powder is used in powder metallurgy as a hydrogenation catalyst, vacuum tube getter, foaming agent in the production of metal foams and as a reducing agent.[4]

References

  1. ↑ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 4–96, ISBN 0-8493-0594-2 
  2. ↑ 2.0 2.1 2.2 2.3 https://pubchem.ncbi.nlm.nih.gov/compound/Zirconium-dihydride
  3. ↑ 3.0 3.1 3.2 http://www.chemspider.com/Chemical-Structure.24771611.html
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 https://www.samaterials.com/zirconia-ceramic/1428-zirconium-hydride.html
  5. ↑ 5.0 5.1 5.2 5.3 https://www.samaterials.com/pdf/Zirconium-Hydride-sds.pdf
  6. ↑ Chertihin, George V.; Andrews, Lester (1995). "Reactions of laser-ablated Zr and Hf atoms with hydrogen. Matrix infrared spectra of the MH, MH2, MH3, and MH4 molecules". The Journal of Physical Chemistry 99 (41): 15004–15010. doi:10.1021/j100041a014. ISSN 0022-3654. 

See also



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