The Structure of Silver Oxide Determined by Means of Neutron Diffraction

Abstract

The crystal structure of normalAgO has been determined by means of neutron diffraction. The nuclear scattering of Ag and O atoms has made it possible to determine the positions of the oxygen atoms and to modify the space group which was reported for this compound from x‐ray data. No magnetic diffractions were observed even at liquid helium temperature; the absence of magnetic scattering confirms the diamagnetism of the compound. The lattice was found to be monoclinic, space group P21/normalc , with four formula weights of normalAgO in the unit cell. The silver atoms are not equivalent, and in the structure there are two Ag‐O distances of 2.18Aå and 2.03Aå; the first one corresponds to colinear Ag(I)‐O bonds, the second distance corresponds to square planar Ag(III)‐O bonds.

Electronic structure of mixed-valence silver oxide AgO from hybrid density-functional theory

“…It has been suggested that Ag lin can be attributed to Ag with an oxidation state of +1 ͑Ag I ͒ and that Ag sq can be attributed to Ag with an oxidation state of +3 ͑Ag III ͒. 8 AgO has been reported to be diamagnetic, 9 which is consistent with spin paired configurations of linearly coordinated 4d 10 Ag I , and square planar 4d 8 Ag III . 13 The coordination environments around the Ag ions in AgO are also consistent with the coordination environments of Ag I in Ag 2 O ͑Ref.…”

“…6 Although not as widely studied as Ag 2 O, several structural and spectroscopic studies have been carried out on AgO in an effort to elucidate the geometry and electronic structure of the material. [7][8][9][10][11][12] AgO crystallizes in a monoclinic structure ͑space group P12 1 / c1͒ with Ag ions in two distinct coordination environments. 7 Neutron-diffraction experiments have indicated that it is composed of linearly coordinated Ag ions ͑denoted Ag lin ͒ and Ag ions in a slightly distorted square planar coordination with four oxygens 8 ͑denoted Ag sq ͒, as shown in Fig.…”

ON THE FORMATION OF "Ag2O3" ON SILVER ELECTRODES

“…If these inferences are correct, it would follo~v that the true crystalline phase AgzO3 is liliely face-centered cubic, lilie Ag,O, and not inonoclinic lilie Ago (9). Indeed the structures of the nitrate-and sulfate-stabilized higher oxides, Agin'Oll and Ag,SOl,, and often confused with Ag203, are close to that of Ag2O (7,8).…”

Oxidación electroquímica de plata y cobre en medio acuoso básico y en hidróxidos fundidos

“…The resulting compounds were characterized by X-Ray diffraction confirming the presence of cubic Ag 2 O in the first oxidation step and a mixture of Ag 2 O and AgO in the last one (see figure 2). It should be noted that AgO is not a Ag(II) phase but has been shown to contain Ag(I) and Ag(III) by means of neutron diffraction [16] and EXAFS data [17][18] .…”