Beschreibung:
<jats:p>Ruby-red single crystals of Ag<jats:sub>13</jats:sub>I<jats:sub>4</jats:sub>(AsO<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub> were prepared for the first time by reacting a stoichiometric mixture of Ag<jats:sub>2</jats:sub>O, AgI and As<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> at elevated oxygen pressure of 120 MPa and at a temperature of 350 <jats:sup>◦</jats:sup>C. The polyhedral crystals belong to the monoclinic space group P2<jats:sub>1</jats:sub>/m with a = 9.247(1), b = 7.152(1), c = 17.674(2) Å , β = 91.492(2)<jats:sup>◦</jats:sup>, and Z = 2. The structure is fully ordered and was solved by Direct Methods, and refined on single crystal diffraction data (10376 observed reflections, R1 = 3.28 %). The crystal structure is built up of two two-dimensional interlocked partial structures, one consisting of silver and iodine ions, the other of silver and arsenate(V) ions. The slabs extend in the ac plane, and the Ag-I framework is linked to the AsO<jats:sub>4</jats:sub>
<jats:sup>3</jats:sup>− units by Ag-O contacts. The silver-oxygen interactions perturb the tetrahedron of the arsenate group, resulting in As-O distances ranging from 1.670 to 1.697 Å, and angles varying from 107.3 to 112.1<jats:sup>◦</jats:sup>. Pure Ag<jats:sub>13</jats:sub>I<jats:sub>4</jats:sub>(AsO<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub> is a solid ion conductor with a r. t. conductivity of 6.4×10<jats:sup>−6</jats:sup> Ω<jats:sup>−1</jats:sup> cm<jats:sup>−1</jats:sup> at 30 <jats:sup>◦</jats:sup>C. The activation energy for silver ion conduction is 0.41 eV in the temperature range from 30 to 130 <jats:sup>◦</jats:sup>C</jats:p>