Zirconium hydride
| Crystal structure | ||||||||||||||||
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| __ Zr 2+ __ H - | ||||||||||||||||
| General | ||||||||||||||||
| Surname | Zirconium hydride | |||||||||||||||
| other names |
Zirconium dihydride |
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| Ratio formula | ZrH 2 | |||||||||||||||
| Brief description |
gray-black solid |
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| properties | ||||||||||||||||
| Molar mass | 93.24 g mol −1 | |||||||||||||||
| Physical state |
firmly |
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| density |
5.61 g cm −3 |
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| solubility |
practically insoluble in water |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | ||||||||||||||||
Zironium hydride (more precisely zirconium (II) hydride) is an inorganic chemical compound of zirconium from the group of hydrides .
Extraction and presentation
Zirconium hydride can be obtained in a not entirely stoichiometric composition by reducing zirconium (IV) oxide with calcium hydride in the presence of hydrogen . It is available in stoichiometrically pure form from zirconium sponge and hydrogen at 300 ° C. The hydrogen uptake is reversible and takes place via the phases ZrH, ZrH 1.58–1.67 to ZrH 1.67–2.00 .
properties
Zirconium hydride is a gray-black solid that is practically insoluble in water. It decomposes when heated above 500 ° C, producing hydrogen and zirconium . The compound has a tetragonal crystal structure with the space group I 4 / mmm (space group no. 139) and the lattice parameters a = 4.999 Å and c = 4.433 Å.
use
Zirconium hydride is used in the manufacture of ceramic materials. It is used as a strong reducing agent in chemistry, in pyrotechnics , in powder metallurgy , as a getter in vacuum tubes , for the production of foamed metals and as a moderator in nuclear reactors . The main use is of a military nature as a component of incendiary and flare sets .
Individual evidence
- ↑ a b c d e f g Entry on zirconium hydride in the GESTIS substance database of the IFA , accessed on January 8, 2020(JavaScript required) .
- ↑ a b Entry on zirconium hydride. In: Römpp Online . Georg Thieme Verlag, accessed on May 24, 2015.
- ↑ Michael V. Glazoff: Modeling of Some Physical Properties of Zirconium Alloys for Nuclear Applications in Support of UFD Campaign, August 2013 ( Memento of the original from May 24, 2015 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , accessed on May 24, 2015.
- ↑ Data sheet Zirconium (II) hydride, −325 mesh, 99% from Sigma-Aldrich , accessed on May 24, 2015 ( PDF ).
