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The phase diagrams of the systems Cu_2S-PbS-Bi_2S_3 and Ag_2S-PbS-Bi_2S_3 have been investigated inthe present study.The paper is concerned with the complete solid solution between bismuthtite and aikiniteabove 300℃ in the system Cu_2S-PbS-Bi_2S_3.The synthetic phases CuBi_3S_5 and Cu_3Bi_5S_9 have their solidsolution ranges in the ternary system with 9 and 26 mole% PbS at maximum,respectively.A complete solid solution between PbS and AgBiS_2 divides the phase diagram of the system Ag_2S-PbS-Bi_2S_3 into two parts:Bi-rich and Ag-rich.All sulfosalt minerals and solid solutions,includingpavonite ss,lillianite ss,heyovskyite and benjaminite are on the Bi-rich side.And divarant relations werefound between pavonite ss -lillianite ss,benjaminite and bismuthtite as well as between lillianite ss-bismuthtite and galenobismutite.Synthetic experiments using LiCl-KCl flux technique show that when a minor amount of copper (lesslwt.%) is added in,many of Ag-and Pb-bismuth sulfosah minerals,for example,vikingite(Ag_5Pb_8Bi_(13)S_(30)),are synthesized successively,particularly at 400℃.So is heyrovskyite,which has a solidsolution range with 3.7 mole% Cu_2S at maximum in the system Cu_2S-PbS-Bi_2S_3.
The phase diagrams of the systems Cu_2S-PbS-Bi_2S_3 and Ag_2S-PbS-Bi_2S_3 have been investigated inthe present study. The paper is concerned with the complete solid solution between bismuthtite and aikiniteabove 300 ° C in the system Cu_2S-PbS-Bi_2S_3. phases CuBi_3S_5 and Cu_3Bi_5S_9 have their solid solution ranges in the ternary system with 9 and 26 mole% PbS at maximum, respectively. A complete solid solution between PbS and AgBiS_2 divides the phase diagram of the system Ag_2S-PbS-Bi_2S_3 into two parts: Bi- rich and Ag-rich. All sulfosalt minerals and solid solutions, including pavonite ss, lillianite ss, heyovskyite and benjaminite are on the Bi-rich side. And divarant relations were found between pavonite ss -lillianite ss, benjaminite and bismuthtite as well as between lillianite ss -bismuthtite and galenobismutite. Synthetic experiments using LiCl-KCl flux technique show that when a minor amount of copper (lesslwt.% is added in, many of Ag-and Pb-bismuth sulfosah minerals, for exa mple, vikingite (Ag_5Pb_8Bi_ (13) S_ (30)) were synthesized successively, especially at 400 ℃ .So is heyrovskyite, which has a solid solution range with 3.7 mole% Cu_2S at maximum in the system Cu_2S-PbS-Bi_2S_3.