Exploratory Synthesis of New Chalcogenide-Containing Materials Using Phosphorus Pentasulfide, Arsenic Trisulfide and Tellurium Sulfide Fluxes
Higgins, Thomas B.
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The utility of the P2S5 flux was explored by systematic reactions with the metal sulfides ZnS, CdS, HgS, FeS2, NiS and MnS. Initial reactions were isothermed at 580°C and subsequent reactions at 350°C. In the subsequent reactions, a third component (either K2S or S) was added to some systems. Promising leads from the latter were followed up by employing different ratios of the starting materials at 350°C. The As2S3 flux was also explored using the metals Zn, Cd, Fe, Ni and Pd. Initial reactions were isothermed at 550°C, but not followed up due to safety concerns. The mixed chalcogenide TeS2 flux was explored using Au, Ag and HgS. In some cases K2S was added to the reaction mixture. Initial reactions were done at 350°C. The novel phases Au2TeS3 and Ag2Te2S were suggested from the Au/K2S/TeS2:l/l/5 and Ag/TeS2:l/3 systems, respectively. Red crystals of KAgTeS3 were isolated from the Ag/K2S/TeS2:l/l/5 system and X-ray diffraction data collected. The unit cell is monoclinic P, space group P21/n with dimensions: a=6.211(8)A, b=16.429(17)A, c=6.323(4)A, beta=97.16(8), V=640(2)A3. This phase has not been structurally characterized to date.