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Sr8Cu5.3Ge40.7 decomposes eutectoidally on cooling at 730{\\deg}C into (Ge), SrGe2 and tau1-SrCu2-xGe2+x. Phase equilibria at 700{\\deg}C have been established for the Ge rich part and are characterized by the appearance of only one ternary compound, tau1-SrCu2-xGe2+x, which crystallizes with the ThCr2Si2 structure type and forms a homogeneity range up to x=0.4 (a = 0.42850(4), c = 1.0370(1) nm). 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