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The phase Na9K16Tl25.25(2) was synthesized by fusion of the elements in sealed Ta containers followed by quenching and annealing at 250°C. The structure established by single crystal X-ray diffraction means (P63/m, Z = 2, a = 19.376(3) Å, c = 11.480(2) Å) features Tl99− clusters. These are well separated by cations that bridge between, faces, edges, and vertices of the clusters; sodium appears to...
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