Silver Ion Dynamics in Ag₂S-Doped Silver Molybdate–Glass Nanocomposites: Correlation of Conductivity and Scaling with Structure

Abstract

This work reports the study of silver ion dynamics in Ag2S-doped silver molybdate–glass nanocomposites of compositions xAg2S–(1 – x)(yAg2O–(1 – y)MoO3). The volume fraction of crystalline phases in these glass nanocomposites increases with the increase of Ag2S content and considerably influences the dc conductivity. It is observed that a significant amount of volume fraction of crystalline phases for x ≥ 0.15 for the y = 0.20 series and for x = 0.20 for the y = 0.30 series causes the conductivity to decrease. The power law exponent has been obtained from ac conductivity spectra using the power law model and is observed to be almost constant at lower volume fraction of the nanocrystalline phases embedded in the glass matrix, but it decreases for samples with high crystalline volume fraction. The electric modulus data have been analyzed on the basis of the Havriliak–Negami (HN) equation. The Kohlrausch–Williams–Watts (KWW) stretched exponent β, obtained from modulus data, indicates a strong nonexponential relaxation. The scaling of the conductivity spectra reveals that the relaxation dynamics is independent of temperature but is dependent on compositions affected by the increased volume fraction of crystalline phases of the glass nanocomposites.

Photoelectrochemical Water Oxidation over Novel Semiconducting Zinc-Based Metal–Thiolate Framework

“…It has been observed for different electronic and ionic conductors that the value of σ obtained from the AC conductivity spectra is very close to that of the DC conductivity obtained from the complex impedance plot. , However, we can see that in Figure S9, the conductivity shows a dispersive nature as the frequency is increased to a maximum value. The back and forth motion of the charge carriers of conductor leads to dispersive conductivity at high frequencies, while the long-range transport leads to the low-frequency plateau marking the DC conductivity. , In our case, for the AC conductivity spectra shown in Figure A, the dispersive region is almost absent due to experimental limitation, as at a high temperature, the dispersive region shifts toward a higher frequency. The complex impedance plots of the sample under anhydrous conditions at different temperatures are shown in Figure S10.…”

“…The back and forth motion of the charge carriers of conductor leads to dispersive conductivity at high frequencies, while the long-range transport leads to the low-frequency plateau marking the DC conductivity. 43,45 In our case, for the AC conductivity spectra shown in Figure 3A, the dispersive region is almost absent due to experimental limitation, as at a high temperature, the dispersive region shifts toward a higher frequency. The complex impedance plots of the sample under anhydrous conditions at different temperatures are shown in Figure S10.…”

Structural, Dielectric, and Thermal Properties of Pb Free Molybdate Based Ultralow Temperature Glass

“…Recently, several materials such as LiMoO 4 , LiMoO 4 –TiO 2 , LiMoO 4 –BaTiO 3 , BaTiO 3 –BBSZ, and NaAgMoO 4 are reported for ULTCC Category I applications. − In addition to the low sintering temperature, ULTCC materials should also have good dielectric, thermal, and mechanical properties, these being important factors for device level integration. Most of the reported category II materials include lithium, sodium, potassium, bismuth, silver, tellurium, and lead based molybdates with sintering temperatures in the range of 400–700 °C. ,,− These materials have relative permittivity in the range of 5–45 and quality factor ( Q f ) of 1000–70 000 GHz. − More recently, MoO 3 with an orthorhombic structure consisting of corner sharing and edge-sharing MoO 6 octahedra has showed potential applications. , In the modern scientific world, molybdates based materials and glasses are getting more attention in technology as well as in materials research. − The primary objective of the present study is to develop environment friendly ULTCC category I composition based on 10Li 2 O–10Na 2 O–20K 2 O–60MoO 3 (LNKM). The preparation, structural, thermal, and dielectric properties of bulk LNKM glass heat treated at 300 °C are presented.…”