Abstract
Three phases are present in the GaTe system: Ga 2Te 5, Ga 2Te 3, and GaTe. Ga 2Te 5 is stable in a narrow temperature domain, between about 400 and 495°C (its peritectic decomposition). The phase diagram is established from DTA and X-ray diffraction studies. The crystal structures of GaTe and Ga 2Te 5 are described. The first one contains GaGa pairs and the second one a square plane coordination of Te, in which the atoms are bonded by covalency. The formation of compounds involving monovalent Ga is discussed, in connection with the existence of SnGa 6Te 10, in which Sn can be substituted by other monovalent or divalent cations.
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