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The c/a ratios of the nine ternary Cu–III–VI 2 compounds in the system Cu(Al,Ga,In)(S,Se,Te) 2 range from 1.939 for CuAlSe 2 to 2.014 (CuInS 2 ) at room temperature. The validity of Vegard's law was presumed to determine the tetragonal deformation 1–c/(2a) for all pentanary mixed crystal compounds Cu–(III,III)–(VI–VI) 2 . For six of these nine compounds it is...
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