Gallium (III) selenide
Crystal structure | ||||||||||||||||
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__ Ga __ Se | ||||||||||||||||
General | ||||||||||||||||
Surname | Gallium (III) selenide | |||||||||||||||
other names |
Gallium sesquiselenide |
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Ratio formula | Ga 2 Se 3 | |||||||||||||||
Brief description |
black solid |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 376.33 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
5.203 g cm −3 |
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Melting point |
1020 ° C |
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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 . |
Gallium (III) selenide is an inorganic chemical compound of gallium from the group of selenides .
Extraction and presentation
Gallium (III) selenide can be obtained by reacting gallium with selenium at high temperatures.
properties
Gallium (III) selenide is a compact mass of black, finely ground red solid that is quite hard and brittle. It has a cubic crystal structure of the zinc blende type with the space group F 4 3 m (space group no. 216) . The compound crystallizes in two modifications. The α-form with a zinc blende grid that is stable at low temperatures and a high-temperature modification (β) with a wurtzite structure . The transition temperature is between 550 ° C and 600 ° C.
Individual evidence
- ↑ a b c d data sheet Gallium (III) selenide, 99.99% (metals basis) from AlfaAesar, accessed on March 4, 2014 ( PDF )(JavaScript required) .
- ↑ a b c d Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 860.
- ↑ Roger Blachnik (Ed.): Paperback for chemists and physicists . Volume III: Elements, Inorganic Compounds and Materials, Minerals . founded by Jean d'Ans, Ellen Lax. 4th, revised and revised edition. Springer, Berlin 1998, ISBN 3-540-60035-3 , pp. 466 ( limited preview in Google Book search).
- ↑ Harry Hahn, Wilhelm Klingler: About the crystal structures of Ga2S3, Ga2Se3 and Ga2Te3. In: Journal of Inorganic Chemistry. 259, 1949, pp. 135-142, doi : 10.1002 / zaac.19492590111 .