Abstract
Single crystals of Ag 7Ca 2 were grown and examined without the application of mechanical stress. The crystal structure was solved by single-crystal X-ray diffraction. Ag 7Ca 2 is orthorhombic, space group Cmcm, a = 9.478(2) A ̊ , b = 5.525(1) A ̊ , c = 14.079(2) A ̊ , Z = 4, R = 0.034 , with a simple new structure type containing Kagomé nets of silver atoms, surrounded by hexagonal and triangular nets of silver and calcium atoms. These layers are then stacked as in hexagonal close packing. Predicted mechanical properties are discussed briefly. The c-axis conductivity of Ag 7Ca 2, measured as a function of temperature on a single crystal, approaches that of silver metal.
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