Abstract

Ag 2Ga 6Te 10 was synthesized from a mixture of AgGaTe 2 and AgGa 5Te 8 at 2.0 GPa and 900 °C in a modified Belt high pressure apparatus. The black lath-like crystals are monoclinic (space group, C2) with a = 14.33 A ̊ , b = 14.308 A ̊ , c = 10.127 A ̊ , β = 90.2° and Z = 4. The arrangement of the tellurium sublattice is nearly identical with the β-manganese structure. Gallium atoms occupy a number of the tetrahedral holes in this structure, forming GaTe 4 tetrahedra and Ga 2Te 6 double tetrahedra. The mobile silver ions are distributed over incompletely filled positions with irregular coordination.

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