Silver(I) selenide
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| Names | |
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| Other names | |
| Identifiers | |
1302-09-6  |
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| PubChem | 6914520 |
| Properties | |
| Ag2Se | |
| Molar mass | 294.7 g/mol |
| Density | 8.216 g/cm3, solid |
| Melting point | 896.85 °C (1,646.33 °F; 1,170.00 K) |
| insoluble | |
| Band gap | 0.15 eV [1] |
| Structure | |
| orthorhombic, oP12 | |
| P212121, No. 19 | |
| Vapor pressure | {{{value}}} |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Silver selenide (Ag2Se) is the reaction product formed when selenium toning analog silver gelatine photo papers in photographic print toning. The selenium toner contains sodium selenite (Na2SeO3) as one of its active ingredients, which is the source of the selenide (Se2−) anion combining with the silver in the toning process.
It is found in nature as the mineral naumannite, a comparatively rare silver mineral which has nevertheless become recognized as important silver compound in some low-sulfer silver ores from mines in Nevada.[2]
Structure
Silver selenide normally exists in the orthorhombic β-phase but at temperatures above 130 °C transforms into the cubic α-Ag2Se (Space group Im-3m, No. 229, Pearson symbol cI20). The phase transition increases ionic conductivity by 10,000 times to about 2 S/cm [3]
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ http://nevada-outback-gems.com/Reference_pages/sulfide_ores.htm Notes on naumannite.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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