DETERMINATION OF PARTIAL PRESSURES OF TE, TE-2, AG, AG-2, AGTE AND AG2TE GASEOUS SPECIES OVER AG(S)+AG2TE(S) SYSTEM

The partial pressures of AE(g), Ag-2(g), Te(g), Te-2(g), AgTe(g) and A g2Te(g) have been measured by Knudsen effusion cell mass spectrometry (KEMS) in the temperature range 1073 to 1319 Ii over the biphasic fiel d (Ag(s) + Ag2Te(s)). Knudsen effusion mass loss experiments over the biphasic field, Ag(s) + Ag2Te(s), was also carried out in the temperat ure range 1088 to 1246 K to understand the vaporization behaviour. Ove r the biphasic field Ag(s)+ Ag2Te(s), the vapour consisted of Te-2(g) and Te(g). Te(g) bring present to the extent of 50% and small concentr ations of Ag(g), Ag-2(g), AgTe(g) and Ag2Te(g) species were also found . Though the presence of Ag2Te(g) in the vapour phase was reported in; he Literature, the present work reports for the first time the tempera ture dependence of partial pressures of Ag2Te(g) species over a large temperature range.