Impedance Response and Dielectric Relaxation in Liquid-Phase Sintered Zn2SnO4-SnO2 Ceramics

Abstract

Impedance/admittance and dielectric spectroscopy were used to investigate the effect of temperature on the electrical response of liquid-phase sintered Zn 2 SnO 4 -SnO 2 ceramics. The measurements were performed over a wide frequency range (100 Hz to 10 MHz) at different temperatures. The real and the imaginary part of the complex impedance traced semicircles in the complex plane. The resistance and the capacitance of bulk and grain-boundary regions were determined by modeling the experimental results using several equivalent circuits taking into account bulk deep trap states. Admittance complex diagrams were also determined in order to understand better the conduction mechanisms occurring in the polycrystalline Zn 2 SnO 4 -SnO 2 system.

Zinc-Tin-Oxide-Based Porous Ceramics: Structure, Preparation and Properties

“…(AB) BO 4 . Even though the valance of the Sn 4+ is higher than of the Zn 2+ ion the substitution is mutual [38] and according to the obtained results [36][37][38][39] the Bi-doping strongly promoted this substitution and contribute to the Zn 2 SnO 4 -SnO 2 solid solution formation, along with the larger regions of pure spinel Zn 2 SnO 4 ( Figure 11) and smaller areas of residual SnO 2 . In Bi-doped ZnO-SnO 2 system, the liquid phase assisted sintering mechanism is obviously responsible for these dramatic microstructural changes and the deviation from the expected formation of single phase cubic spinel Zn 2 SnO 4 .…”

“…The effect of small amounts of bismuth oxide (Bi 2 O 3 ) on the microstructure, optical, structural and electrical properties of the spinel-type ZnO-SnO 2 (zinc-tin-oxide) ceramics was investigated [36][37][38][39] to complement the above-shown research on the zinc-tin-oxide porous ceramics. Two series of samples were made for this purpose.…”

“…Addition of the small amounts of Bi 2 O 3 to the ZnO-SnO 2 system creates conditions for the liquid phase sintering and enhances the densification process. The obtained structure and morphology was examined using XRD and SEM-EDS [36][37][38][39]. FTIR and impedance spectroscopy were used to investigate the optical and electrical properties [38,39] [36,38] (Figure 11).…”

“…The obtained structure and morphology was examined using XRD and SEM-EDS [36][37][38][39]. FTIR and impedance spectroscopy were used to investigate the optical and electrical properties [38,39] [36,38] (Figure 11). Probably the diffusionevaporation mechanisms are responsible for the reaction between the ZnO and SnO 2 in this case of this material sintered at such high temperatures, and not just the ordinary diffusion processes that happen in the usual solid-state chemical reactions.…”

One-pot hydrothermal synthesis of highly efficient SnOx/Zn2SnO4 composite photocatalyst for the degradation of methyl orange and gaseous benzene

“…Taking the most studied SnO2/ZTO (SZTO) as example, it is commonly prepared by sintering of SnO2 and ZnO mixture at ca. 1000 o C [32,37] or thermal treatment of ZnSn(OH)6…”