hide
Free keywords:
silver iodate(VII); oxygen pressure; crystal structure
Abstract:
The silver iodate(VII), Ag5IO6, was obtained by reacting a
stoichiometric mixture of Ag2O and KIO3, at elevated oxygen pressure,
adding a small portion of distilled water. The synthesis was done at
673 K and 270 MPa of oxygen pressure. The crystal structure was solved
by direct methods based on single crystal diffraction data (R3c, Z = 6,
a = 5.9366(1), c = 32.1471(6) angstrom, 323 independent reflections,
R-1 = 2.31 %). According to conductivity measurements, Ag5IO6 is
semiconducting with a specific resistance of 0.08 Omega cm at 300 K.
The activation energy was determined as 7.4(1) meV in the temperature
range of 220 - 300 K, and 4.3(1) meV in the temperature range of 90 -
180 K. The optical band gap for Ag5IO6 is 1.4 eV. Ag5IO6 is diamagnetic
with a magnetic susceptibility of -4.4 x 10(-4) emu/mol.
