Thermalstability of the thermoelements based on Bi₂Te₃-Sb₂Te₃with multi-layer coating obtained by technique of electron-beam evaporation andcondensation of metals in vacuum

S.M Manyakin., M.P Volkov., A.A.Sidorov

CRYSTALCo., LTD., 45 B Stantsionnaya str., Korolev, Moscow Region, Russia 141060

The influence oftemperature and time of thermal treatment on thermoelectrical parameters ofthermoelements of n- and p- type has been investigated. The thermoelements,based on solid state solutions of Bi₂Te3-Sb₂Te₃with multi-layer coating deposited in vacuum by technique of electron-beamevaporation and condensation, were assembled into modules and were annealed inair at temperature of 90-150⁰C. The coating consists of threelayers: antidiffusion layer (molybdenum, etc.), connecting layer (nickel), andprotective layer (Sn-Bi alloy).

The composition andthickness of antidiffusion and connecting layers have the strongest influenceon thermal stability of the thermoelements.