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In the ternary system Sr-Cu-Ge, a clathrate type-I phase, Sr8Cu5.3Ge40.7 (a =1.06311(3), exists close to the Zintl limit in a small temperature interval.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 beenestablished for the Ge rich part and are characterized by the appearance ofonly one ternary compound, tau1-SrCu2-xGe2+x, which crystallizes with theThCr2Si2 structure type and forms a homogeneity range up to x=0.4 (a =0.42850(4), c = 1.0370(1) nm). Additionally, the extent of the clathrate type-Isolid solution Ba8-xSrxCuyGe46-y (5.2 < y < 5.4) has been studied at varioustemperatures. The clathrate type-I crystal structure (space group ) has beenproven by X-ray single crystal diffraction on two single crystals withcomposition Sr8Cu5.3Ge40.7 (a = 1.06368(2) nm) and Ba4.9Sr3.1Cu5.3Ge40.7 (a =1.06748(2) nm) measured at 300, 200 and 100 K. From the temperature dependencyof the lattice parameters and the atomic displacement parameters, the thermalexpansion coefficients, the Debye- and Einstein-temperatures and the speed ofsound have been determined. From heat capacity measurements of Sr8Cu5.3Ge40.7at low temperatures, the Sommerfeld coefficient and the Debye temperature havebeen extracted, whereas from a detailed analysis of these data at highertemperatures, Einstein branches of the phonon dispersion relation have beenderived and compared with those obtained from the atomic displacementparameters. Electrical resistivity measurements of Sr8Cu5.3Ge40.7 reveal arather metallic behaviour in the low temperature range (< 300 K).

Clathrate formation in the systems Sr-Cu-Ge and {Ba,Sr}-Cu-Ge