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Phase relations in the ternary systems Ag_2S-Cu_2S-PbS and Ag_2S-Cu_2S-Bi_2S_3 were studied using thesilica vacuum technique.In the system Ag_2S-Cu_2S-Bi_2S_3 the phase relations are dominated by join-lines from galena to f.c.c.(Ag_xCu_(2-x)S)and b.c.c.(Cu_xAg_(2-x)S) at 500℃.With decreasing temperature,galena can coexist with all thephases on the Ag_2S-Cu_2S join.There are six solid solutions,and one new phase,i.e.,“C” whose composition is Ag_(1.1)Cu_(4.8)Bi_(5.8)S_(12) inthe system Ag_2S—Cu_2S-Bi_2S_3 at 500℃.The pavonite (AgBi_3S_5)contains 14 mole% Cu_2S in solid solution,but only 3.0 mole% Ag_2S in CuBi_2S_5 solid solution.The Cu_3Bi_5S_9 ss and wittichenite (Cu_3BiS_3)ss canform join-lines with pavonite ss and have the maximum contents of 9.0 and 18 mole% Ag_2S.The moststriking feature is the presence of bejaminite as a stable phase with a chemical formula of Ag_2Bi_4S_7 on theAg_2S-Bi_2S_3 join.AgBiS_2 of the PbS type occupies a fairly large field with a maximum of 23 mole% Cu_2S.
Phase relations in the ternary systems Ag_2S-Cu_2S-PbS and Ag_2S-Cu_2S-Bi_2S_3 were studied using thesilica vacuum technique.In the system Ag_2S-Cu_2S-Bi_2S_3 the phase relations are dominated by join-lines from galena to fcc (Ag_xCu_ (2- at temperatures of 500 ° C. With decreasing temperature, galena can coexist with all the phases on the Ag_2S-Cu_2S join. There are six solid solutions, and one new phase, ie, " The composition of Ag_ (1.1) Cu_ (4.8) Bi_ (5.8) S_ (12) inthe system Ag_2S-Cu_2S-Bi_2S_3 at 500 ℃ .The pavonite (AgBi_3S_5) contains 14 mole% Cu_2S in solid solution, % Ag_2S in CuBi_2S_5 solid solution.The Cu_3Bi_5S_9 ss and wittichenite (Cu_3BiS_3) ss can be joined-lines with pavonite ss and have the maximum contents of 9.0 and 18 mole% Ag_2S.The moststriking feature is the presence of bejaminite as a stable phase with a chemical formula of Ag_2Bi_4S_7 on theAg_2S-Bi_2S_3 join.AgBiS_2 of the PbS type occupies a relatively large field with a maximum of 23 mole% Cu_2S.