Silver (I) selenide
Crystal structure | ||||||||||||||||
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__ Ag __ Se | ||||||||||||||||
General | ||||||||||||||||
Surname | Silver (I) selenide | |||||||||||||||
Ratio formula | Ag 2 Se | |||||||||||||||
Brief description |
black solid |
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properties | ||||||||||||||||
Molar mass | 294.70 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
8.22 g cm −3 (25 ° C) |
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Melting point |
880 ° 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 . |
Silver (I) selenide is an inorganic chemical compound of silver from the group of selenides .
Occurrence
Silver (I) selenide occurs naturally in the form of the mineral naumannite . The compound is also found in the anode sludge produced during copper refining .
Extraction and presentation
Silver (I) selenide can be obtained by reacting silver with selenium at 400 ° C.
It is also possible to display it by reacting soluble silver salts with copper (I) selenide .
properties
Silver (I) selenide is a black, crystalline solid. At 75 ° C it has a tetragonal (a = 49.8 pm, c = 47.8 pm) and at 240 ° C a cubic crystal structure . Other sources indicate an orthorhombic crystal structure for the former. It is a I-VI semiconductor , but is rarely used because of its poor strength and solubility.
Individual evidence
- ↑ 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. 1000.
- ↑ a b c data sheet Silver (I) selenide from Sigma-Aldrich , accessed on May 25, 2017 ( PDF ).
- ↑ a b Perrin Walker, William H. Tarn: CRC Handbook of Metal Etchants . CRC Press, 1990, ISBN 0-8493-3623-6 , pp. 1166 ( limited preview in Google Book search).
- ↑ Erwin Riedel, Christoph Janiak: Inorganic Chemistry . Walter de Gruyter, 2011, ISBN 3-11-022567-0 , p. 437 ( limited preview in Google Book search).
- ↑ Collaboration: Authors and editors of the volumes III / 17E-17F-41C: Silver selenide (Ag2Se) crystal structure, lattice parameters . In: O. Madelung, U. Rössler, M. Schulz (eds.): Non-Tetrahedrally Bonded Elements and Binary Compounds I (= Landolt-Börnstein - Group III Condensed Matter ). tape 41 C. Springer, Berlin / Heidelberg 1998, ISBN 3-540-64583-7 , pp. 1-4 , doi : 10.1007 / 10681727_93 .
- ^ YI Aliyev, AG Babayev, DI Ismayilov, YG Asadov: The structural and thermodynamic aspects of polymorphic transformations in Ag 2 Se . In: Fizika . vol . XII, No. 3 , 2007, p. 56–61 ( gov.az [PDF; accessed April 17, 2014]).