Characterization of Fe$^{3+}$-doped silver phosphate glasses

[摘要] The relationship among the composition, structure and selected properties for five series of silver phosphate glasses containing 0, 5, 10, 15 and 20wt% Fe$_2$O$_3$ has been investigated. The synthesized glasses have been characterized using different experimental techniques. X-ray diffraction studies revealed that the glasses are amorphous in nature. IR spectral studies have shown the presence of characteristic Pâ€�?�Oâ€�?�P linkages of linear phosphate chains,presence of Oâ€�?�Pâ€�?�O units in the phosphate tetrahedral and the formation of Pâ€�?�Oâ€�?�Fe bonds in the doped glass. It is also confirmed that due to doping of Fe$_2$O$_3$, loosening of glassy structure occurred and the glass became more disordered. Differential scanning calorimetric (DSC) studies revealed that glass transition temperature increased with Fe$_2$O$_3$ concentration. Scanning electron microscopic studies have shown that Fe$_2$O$_3$ doping modifies the microstructures of the glass and at lower concentration of dopant, a nanostructure is obtained. Electrical conductivity measurements from 303 to 373 K in a frequency range from 100 Hz to 5 MHz have indicated that all glasses are ionic conductors with Ag$^+$ ions as the charge carrier. Fe$_2$O$_3$ doping in silver phosphate glass increased the electrical conductivities. Results have shown that dielectric constants increased with the increase of temperature at all the frequencies; a.c. and d.c. conductivities have been separated and a Coleâ€�?�Cole plot is also drawn. Dielectric losses in all the glasses decreased with frequency at a particular temperature. It is found that Ag$_2$Oâ€�?�P$_2$O$_5$ glass doped with 5wt% Fe$_2$O$_3$ gives high OCV value and the doped glass can be used as an electrolyte for solid-state batteries.

[学科分类] 材料工程

[关键词] Doping;glasses;FTIR;ionic conductivities;XRD.