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The elements rhenium and selenium(2-3 g) were carefully  degassed(1*e-2 Pa) in a thick walled quartz crucible (diameters ext. 20mm, int. 12mm). After sealing off the crucible, bromine was evaporated from an enclosed soft glass ampulla which was then removed. The crucible was slowly heated up to 1000 ¡æ, so that the reaction was achieved after 72 h. The chemical vapour transport reaction took place during three weeks in a two zone tube furnace between 1120 ¡æ and 1080 ¡æ. After slow cooling (100 ¡æ/h) grey shiny crystalline samples were obtained.

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