The copper chalcogenides family consists of a relatively large number of binary and ternary members and has had a significant impact in energy applications as some of the leading photovoltaic materials. Ternary copper chalcogenides can be divided into two groups: compounds with chain structures and compounds with layered structures. At the same time, these compounds can be separated into copper (I) chalcogenides (semiconducting) and mixed-valence copper chalcogenides (metallic). The copper oxide family on the other hand has had a huge impact on the development of the field of unconventional superconductivity. The list of unconventional superconductors has recently been expanded by the discovery of the ternary iron pnictides Ba1-xKxFe2As2 and chalcogenides KxFe2-ySe2. Interestingly, all these materials share two common features: a) a structural characteristic which is the presence of an infinitely extended square sublattice featuring tetrahedral metal centers e.g. [Fe2As2], [Fe2Se2] and b) mixed valency in the transition metal. In an effort to investigate the electronic properties of the corresponding series Ba1-xNaxCu2S2 we discovered a new quaternary compound in the Ba-Na-Cu-S system with a novel structure and p-type metallic behavior. We report the synthesis, structure and properties of valence precise but hole doped phase, NaBa2Cu3S5, which features an anti PbO-type [Cu2S2] layers intercalated with Ba, Na cations and disulfide [S22-] anions. New compounds in the Na-Cu-Q (Q=S, Se) system will be also presented.

NaBa2Cu3S5: A doped p-type semiconductor

246th National Meeting (2013)

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