The phase study of the TlVS system and the properties of TlV6S8 and TlV5S8 phases |
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Authors: | T Ohtani S Onoue |
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Institution: | Okayama University of Science, Laboratory for Solid State Chemistry, 1-1 Ridai-cho, Okayama 700, Japan |
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Abstract: | The ternary phase diagram of the TlVS system was investigated using samples quenched from 400°C, especially in the neighborhood of TlV6S8 and TlV5S8 phases. The TlV6S8 phase (TlxV6Sy) exists between 0.75 < x < 1.00 and 7.55 < y < 7.90, and the TlV5S8 phase (Tlx′V5Sy′) between 0.70 < x′ < 1.00 and 7.54 < y′ < 7.98. A new ternary phase with the nominal composition of TlV2S4 was found in addition to the three known ternary phases. The entirely deintercalated V6S7.8 with the framework structure was obtained by using 1 N AlCl3 + 0.01 N FeCl3 aqueous solution, while the lower phase limit of the TlV5S8 phase was Tl0.33V5S8 consistent with the earlier work. The electrical resistivity and the magnetic susceptibility measurements show that these compounds are expected to be weakly magnetic itinerant-electron systems. |
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