In the Li-Cu-O system two new ternary phases have been found, tentatively described by the stoichiometries LiCu3O3and LiCu2O2, and both containing Cu1and Cu11. They exhibit p-type "hopping" conduction owing to localized charge carriers. Their powder patterns are successfully indexed on high-symmetry cells where the dimensions depend on a slightly variable stoichiometry. LiCu3O3is tetragonal with a = 2.815 (·√2) A ̊ and c = 8.88 A ̊. LiCu2O2is orthorhombic with a = 5.72 A ̊, b = 2.86 A ̊ and c = 12.4 A ̊. Li3Cu2O4, containing Cu11and Cu111, is indexed on a C-centred monoclinic cell: a = 9.958 A ̊, b = 2.777, c = 7.281 A ̊ and β = 118.77 °. The solubility of lithium in CuO is maximally Li0.06Cu0.94O for supersaturation at 1100 K. The equilibrium solubility limit is about Li0.02Cu0.98O, for which the solid solution is still semiconducting. The temperature dependence of the magnetic susceptibility is similar to that of pure CuO but TNis considerably lower. © 1991.
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