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- W2953030349 abstract "The new materials BaCu{sub {delta}}Ag{sub 2-{delta}}Te{sub 2} (0{<=}{delta}{<=}2) were prepared from the elements at 800 deg. C in evacuated silica tubes. BaAg{sub 2}Te{sub 2} crystallizes in the {alpha}-BaCu{sub 2}S{sub 2} type, space group Pnma, with lattice parameters a=10.8897(3) A, b=4.6084(1) A, c=11.8134(3) A (Z=4). The structure consists of a three-dimensional network of vertex- and edge-condensed AgTe{sub 4} tetrahedra, which includes the Ba{sup 2+} cations in linear channels running along the short b-axis. Half of the Ag atoms participate in an Ag atom zigzag chain extended parallel to the channels. BaAg{sub 2}Te{sub 2} is a p-type semiconductor with large Seebeck coefficient. Within the series BaCu{sub {delta}}Ag{sub 2-{delta}}Te{sub 2}, the electrical conductivity increases and the Seebeck coefficient decreases strongly with increasing Cu content. - Graphical abstract: The tellurides BaCu{sub {delta}}Ag{sub 2-{delta}}Te{sub 2} all crystallize in the {alpha}-BaCu{sub 2}S{sub 2} type. The Ag atoms prefer the M2 sites with short M-M bonds (solid lines). The materials are (degenerate) p-type semiconductors. Higher Ag content reflects itself in higher Seebeck coefficient and lower electrical conductivity." @default.
- W2953030349 created "2019-06-27" @default.
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- W2953030349 date "2008-11-18" @default.
- W2953030349 modified "2023-10-08" @default.
- W2953030349 title "ChemInform Abstract: Structure and Physical Properties of the New Telluride BaAg2Te2and Its Quaternary Variants BaCuδAg2-δTe2." @default.
- W2953030349 cites W2016836223 @default.
- W2953030349 doi "https://doi.org/10.1002/chin.200847019" @default.
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