Computer generated random network models of ion exchanged glasses

Photoluminescence enhancement of Eu3+ ions by Ag species in SiO2 three-dimensionally ordered macroporous materials

“…From the XPS spectra, it can be seen that the binding energies related to the Ag species were located at 367.9 and 368.4 eV, which reveals that the chemical states of silver in the SiO 2 -Ag-Eu 3DOM material were Ag + and Ag 0 . 25,26 On the basis of previous structural investigations of various crystalline silver compounds, these Ag + -Ag + pair formation is attributed to homoatomic interactions between closed d 10 shells. 3.…”

“…21 The excitation spectra of pure SiO 2 , SiO 2 -Ag and SiO 2 -Eu 3DOM materials sintered at 550 1C are shown in Fig. [25][26][27] In order to demonstrate the presence of Ag + -Ag + pairs, only Ag + including SiO 2 -Ag 3DOM sample were prepared at 400 1C. The excitation spectrum monitored at 396 or 360 nm emissions in the pure SiO 2 3DOM materials formed at 550 1C consists of an excitation band located at 245 nm and an excitation band at 280 nm.…”

“…17 Ag + can aggregate to form the Ag + -Ag + pairs when the distance between the Ag + ions is close to 3 Å. 25,26 On the basis of previous structural investigations of various crystalline silver compounds, these Ag + -Ag + pair formation is attributed to homoatomic interactions between closed d 10 shells. [25][26][27] In order to demonstrate the presence of Ag + -Ag + pairs, only Ag + including SiO 2 -Ag 3DOM sample were prepared at 400 1C.…”

“…25,26 On the basis of previous structural investigations of various crystalline silver compounds, these Ag + -Ag + pair formation is attributed to homoatomic interactions between closed d 10 shells. [25][26][27] In order to demonstrate the presence of Ag + -Ag + pairs, only Ag + including SiO 2 -Ag 3DOM sample were prepared at 400 1C. 12 The XPS spectra of only Ag + including SiO 2 -Ag 3DOM sample were measured, as shown in Fig.…”

Synthesis of nanosized silver particles in ion-exchanged glass by electron beam irradiation

“…By this procedure, only a few percent of the Ag ϩ ions introduced are converted to particulate silver. 16 The formation of crystalline Ag particles under irradiation, however, is induced by electron energy deposition in the glass leading to secondary electron emission. The radiation enhanced diffusivity being some orders of magnitude larger than the corresponding thermal one 6 together with bond breaking and defect creation inside the glass network favor the precipitation of silver not only at distinctly lower temperatures, but also at considerably higher rates.…”