Yttrium hydride
General | ||||||||||||||||
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Surname | Yttrium hydride | |||||||||||||||
other names |
Yttrium trihydride |
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Molecular formula | YH 3 | |||||||||||||||
Brief description |
yellow solid |
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properties | ||||||||||||||||
Molar mass | 91.93 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
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Melting point |
300 ° C (decomposition) |
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safety instructions | ||||||||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Yttrium hydride (more precisely yttrium trihydride) is a chemical compound of yttrium from the group of hydrides . In addition, another hydride is known with yttrium dihydride.
Extraction and presentation
Yttrium hydride can be obtained by reacting yttrium dihydride with hydrogen .
properties
Yttrium hydride is a yellow solid. It decomposes above 300 ° C.
It has a hexagonal crystal structure with the space group P 6 3 cm (space group no. 185) . There is also a modification with the space group Fm 3 m (No. 225) .
use
While yttrium and yttrium dihydride have a metallic character and reflect visible light, yttrium trihydride is optically transparent in a thin layer. Under suitable conditions, a transition between these two connections takes place within fractions of a second, so that this process is abrupt for the human eye. The reversibility of this effect makes it interesting for technological applications such as mirrors or glasses. Since the hydrogen-induced optical switching has so far only been observed in thin layers, but not in volume samples, it is conceivable that the optical transparency is a property of thin layers. Yttrium trihydride has also been studied for use as a moderator in nuclear reactors.
Individual evidence
- ^ A b c d Andreas Züttel, Andreas Borgschulte, Louis Schlapbach: Hydrogen as a Future Energy Carrier . John Wiley & Sons, 2011, ISBN 3-527-62290-X , p. 299.
- ^ A b William M. Mueller, James P. Blackledge, George G. Libowitz: Metal Hydrides . Elsevier, 2013, ISBN 978-1-4832-7293-1 ( limited preview in Google Book Search).
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
- ^ William M. Mueller, James P. Blackledge, George G. Libowitz: Metal Hydrides . Elsevier, 2013, ISBN 978-1-4832-7293-1 , pp. 450 ( limited preview in Google Book Search).
- ^ William M. Mueller, James P. Blackledge, George G. Libowitz: Metal Hydrides. Elsevier, 2013, ISBN 978-1-4832-7293-1 , p. 443 ( limited preview in Google book search).
- ↑ Ana Maria Racu: Micro-Raman spectroscopy study of ordering phenomena in YH x thin films and in CuTe 2 O 5 single crystals. Cuvillier Verlag, 2005, ISBN 978-3-86537-567-4 , p. 36 ( limited preview in Google book search).
- ↑ Laboratory 67: Hydrogen Materials Science and Chemistry of Carbon Nanomaterials Ichms 2005. Laboratory 67, p. 228 ( limited preview in the Google book search).
- ↑ R. Griessen: Switchable mirrors made of metal hydrides. In: Physics Journal. 53, 1997, p. 1207, doi: 10.1002 / phbl.19970531210 .
- ↑ Remhof, Arndt: hydrogen in yttrium films: structure and phase formation. Dissertation, Ruhr University Bochum, 2000 urn : nbn: de: hbz: 294-372 ( abstract ).
- ^ William M. Mueller, James P. Blackledge, George G. Libowitz: Metal Hydrides . Elsevier, 2013, ISBN 978-1-4832-7293-1 , pp. 442 ( limited preview in Google Book search).