(Bi/sub 2/Te/sub 3/)/sub 0.9/(Bi/sub 2/Se/sub 3/)/sub 0.1/ for n type material powder and (Bi/sub 2/Te/sub 3/)/sub 0.25/(Sb/sub 2/Te/sub 3/)/sub 0.75/ for p type material powder were evaporated by flash evaporation technique. We obtained a value of Z equal to 0....