Silver telluride
Chemical compound
From Wikipedia, the free encyclopedia
Silver telluride (Ag2Te) is a chemical compound, a telluride of silver, also known as disilver telluride or silver(I) telluride. It forms a monoclinic crystal. In a wider sense, silver telluride can be used to denote AgTe (silver(II) telluride, a metastable compound) or Ag5Te3.
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3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.031.277 |
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CompTox Dashboard (EPA) |
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| Properties | |
| Ag2Te | |
| Molar mass | 341.3364 g/mol |
| Appearance | grey-black crystals |
| Density | 8.318 g/cm3 |
| Melting point | 955 °C (1,751 °F; 1,228 K) |
Refractive index (nD) |
3.4 |
| Structure | |
| Monoclinic, mP12 | |
| P21/c, No. 14 | |
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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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Properties
Silver telluride is a semiconductor which can be doped both n-type and p-type. Stoichiometric Ag2Te has n-type conductivity. On heating silver is lost from the material.
Non-stoichiometric silver telluride has shown extraordinary magnetoresistance.
Occurrence
Silver(I) telluride occurs naturally as the mineral hessite, whereas silver(II) telluride is known as empressite. A silver gold telluride occurs as sylvanite.
Synthesis
Porous silver telluride (AgTe) is synthesized by an electrochemical deposition method. A potentiostat and a three-electrode cell with sulfuric acid electrolyte containing Ag nanoparticles at are used. A silver paste used in the tungsten ditelluride (WTe2) attachment leaches into the electrolyte, causing Ag to dissolve in the electrolyte. The electrolyte is stirred to remove hydrogen bubbles. A silver-silver chloride electrode and a platinum wire can be used as reference and counter electrodes. In order to grow the porous AgTe, the WTe2 is treated with cyclic voltammetry.[1]
Glutathione-coated Ag2Te nanoparticles can be synthesized by preparing a solution containing AgNO3, Na2TeO3, and glutathione. N2H4 is added under stirring in an ice bath. The resulting product is washed for purification.[2]
