Niobium germanium
| Crystal structure | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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| __ Nb __ Ge | ||||||||||
| Crystal system |
cubic |
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| Space group |
Pm 3 n (No. 223) |
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| General | ||||||||||
| Surname | Niobium germanium | |||||||||
| other names |
Germanium triniobe |
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| Ratio formula | GeNb 3 | |||||||||
| External identifiers / databases | ||||||||||
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| properties | ||||||||||
| Molar mass | 351.36 g mol −1 | |||||||||
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | ||||||||||
Niobium germanium is an intermetallic chemical compound from the group of niobium - germanium compounds. In addition to the well-studied form GeNb 3 , GeNb, GeNb 2 , GeNb 4 , Ge 3 Nb, Ge 7 Nb 10 , Ge 0.8 Nb 3.2 , Ge 3 Nb 5 , Ge 2 Nb 3 , Ge 2 Nb and many more non-stoichiometric phases known.
Extraction and presentation
Niobgermanium can be obtained by quenching a melt of the elements or by reduction mixture of niobium pentachloride and germanium (IV) chloride with hydrogen can be obtained at 1000 to 1300 ° C.
properties
Niobium germanium is a superconductor with a transition temperature of 23.2 K, which was discovered in 1973. It has a crystal structure of the type of β-modification of tungsten . Like Nb 3 Sn, it crystallizes in ordered structures of the so-called A15 type with the space group Pm 3 n (space group number 223) , the striking structural feature of which is the short niobium-niobium distances of 258 pm .
use
Niobium germanium is used in Josephson junctions and in superconducting quantum interference units (SQUIDs).
Individual evidence
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
- ↑ a b c d Jane E. Macintyre: Dictionary of Inorganic Compounds . CRC Press, 1992, ISBN 978-0-412-30120-9 , pp. 3315 ( limited preview in Google Book search).
- ^ William S. Rees, Jr .: CVD of Nonmetals . John Wiley & Sons, 2008, ISBN 3-527-61480-X , pp. 57 ( limited preview in Google Book search).
- ↑ S. Chikazumi, Norio MIURA: Physics in High Magnetic Fields Proceedings of the Oji International Seminar Hakone, Japan, 10 to 13 September 1980 . Springer Science & Business Media, 2012, ISBN 978-3-642-81595-9 , pp. 20 ( limited preview in Google Book search).
- ↑ Heiko Lueken: Magnetochemistry An introduction to theory and application . Springer-Verlag, 2013, ISBN 978-3-322-80118-0 , p. 26 ( limited preview in Google Book search).
- ↑ IA Parinov: Microstructure and Properties of High-Temperature Superconductors . Springer Science & Business Media, 2013, ISBN 978-3-642-34441-1 , p. 1 ( limited preview in Google Book search).
- ^ Christoph Janiak, Hans-Jürgen Meyer, Dietrich Gudat, Ralf Alsfasser: Riedel Modern Inorganic Chemistry . Walter de Gruyter, 2012, ISBN 978-3-11-024901-9 , p. 326 ( limited preview in Google Book search).