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The bonding and electronic structure of an electron-deficient solid Na 1.9 Cu 2 Se 2 Cu 2 O are analyzed with the extended Huckel tight-binding method. This solid consists of three kinds of layers: a Cu 2 O layer with square-coordinated oxygen atoms, an anti-PbO type Cu 2 Se 2 layer, and a cationic Na layer. The Cu 2 O layer...
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