High Oxidation State Alkali-Metal Late-Transition-Metal Oxides

摘要

Li_2NaCu_2O_4 has been prepared by solid state reaction under high-pressure (250 Atm) oxygen.A structural study,using time-of-flight powder neutron diffractio non a sample made with ~7Li,shows a material isostructural with Li_3Cu_2O_4,with sodium occupying the octahedral and lithium the tetrahedral A-cation sites.A ~7Li MAS-NMR study of Li_3Cu_2O_4,Li_2NaCu_2O_4 and Li_2CuO_2 has been used to confirm the Li/Na site ordering.