Structural and physical characteristics of Au₂O₃‐doped sodium antimonate glasses – Part I

Abstract

Na2O‐Sb2O3 glasses doped with different concentrations of Au2O3 were prepared by melt quenching technique and later were heat treated at 800°C for 6 hours. Structural analysis by XRD, XPS, SEM, EDS, and DSC techniques indicated that the samples are embedded with multiple crystallites composed of Sb3+, Sb5+, Au3+ ions, and Au0 metallic particles. These studies have further demonstrated a gradual increasing fraction of Au0 metallic particles with increasing Au2O3 concentration. IR spectral studies suggested increasing the degree of polymerization of the glass network (due to increasing concentration of Sb5+ ions that participate in the glass network with SbVO4 structural units) with rise in the concentration of Au2O3. Optical absorption spectra of the titled samples have exhibited a broad absorption band at about 530 nm predicted due to the surface plasmon resonance (SPR) and exhibited a spectral red shift with increasing intensity with increase in Au2O3 content. Photoluminescence (PL) spectra of the samples recorded (at λexc = corresponding SPR band position) exhibited an emission peak at about 580 nm (identified as being due to interband transition between sp and d bands of gold particles). Overall, the analysis of these results has confirmed increasing concentration of Au metallic particles with increase in Au2O3 content in the titled material. Finally, it is predicted that the presence of higher concentration of gold particles in the polymerized antimonate glass network makes the materials useful for designing different nano dimensional optoelectronic devices.

Fabrication of gold ruby glasses using solar panel glass cullet

“…Additionally, Ashok et al 19) reported that in sodium antimonite glasses, the gold atom substitutes a part of Sb 3+ in Sb 2 O 3 and exists as Au 3+ . Then, the Au 0 formation process occurs with Sb 2 O 3 as a reducing agent:…”

“…The red shift of the peak wavelength with the temperature of isothermal treatment is related to the variation in the diameter of gold particles. 16)18) Red colors in the SPG sample probably containing gold nanoparticles with diameters of 515 nm 15), 19) were obtained via isothermal treatments at 600 or 620°C. As for the 10B-SPG sample, the viscosity at 600620°C was expected to be 7.7 © 10 8 9.3 © 10 9 Pa•s via the analysis of the VFT equation (Table 2).…”

Influence of silver ion concentration on dielectric characteristics of Li2O-Nb2O5-P2O5 glasses

“…Using the values of density d and average molecular weight M of Li 2 O-Nb 2 O 5 -P 2 O 5 :Ag 2 O glasses, Ag + ion concentration N i and mean Ag + ion separation r i are evaluated using the conventional formulae (mentioned in our recent report [19]) and are presented in Table 2.…”

Structural and physical characteristics of Au2O3‐doped sodium antimonate glasses – Part II electrical characteristics

“…The alkali antimonatate glass‐ceramic containing gold matallic particles are predicted to be more useful as electrolytes in solid‐state batteries, in the design of nano‐dimensional optoelectronic circuits and optical memory devices with very high recording speed and storage . In continuation of earlier studies and for getting further support of these findings and for having some knowledge over electrical characteristics, this study is aimed to report results of quantitative studies on dielectric properties over broad ranges of continuous frequencies and temperatures, A.C. and D.C. conductivities and other related parameters measured as a function of concentration of Au 2 O 3 . For better assessment of the structural modifications taking place in the material due to the varied concentration of Au 2 O 3 , results of Raman spectra are also used in this study.…”

“…The studies have further revealed increasing concentration of Sb 5+ crystal phases and Au 0 metallic particles with a gradual increase in Au 2 O 3 content in the samples. The increasing presence of Sb 5+ ions (that are predicted to participate in the glass network with Sb(v)O 4 structural units) causes to increase the degree of polymerization of the host glass network …”