Silver telluride

Silver telluride

Names
Other names Hessite
Identifiers
CAS Number	12002-99-2
ECHA InfoCard	100.031.277
PubChem CID	6914515
Properties
Chemical formula	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
Crystal structure	Monoclinic, mP12
Space group	P21/c, No. 14
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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.

Silver(I) telluride occurs naturally as the mineral hessite, whereas silver(II) telluride is known as empressite.

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.

References

• Aliev, F. F. (2002). "Phase Transition of Ag_Enriched Ag₂Te". Inorganic Materials. 38 (10): 995. doi:10.1023/A:1020512918319.
• Chuprakov, I. S.; Dahmen, K. H. (1998). "Large positive magnetoresistance in thin films of silver telluride". Applied Physics Letters. 72 (17): 2165. Bibcode:1998ApPhL..72.2165C. doi:10.1063/1.121309.
• Dalven, Richard (1966). "Fundamental Optical Absorption in β-Silver Telluride". Physical Review Letters. 16 (8): 311. Bibcode:1966PhRvL..16..311D. doi:10.1103/PhysRevLett.16.311.

See also

• Hessite
• Empressite
• Sylvanite

Related materials

• Silver selenide
• Silver sulfide