Diffusive barrier in silver phosphate and silver borophosphate glasses

Abstract

Dielectric measurements are carried out on [60Ag20-x B20,-(40x) P20,] glasses in the frequency and temperature range to lo5 Hz and 120 to 400 K, respectively. The observed dielectric data show an interfacial barrier at the metal-glass contact and reveal a barrier relaxation timebarrier width d, = 8.8 nm, and dc conductivity odC z 1.67 x R-' m-' for the [60Ag20-8 B,O,-32 P,O,] glass at room temperature. A capacitive contribution from BPO, and PO, groups in the bulk along with an interfacial layer capacitance is suggested to be responsible for the large dispersion observed in C(o). The activation energies for threc different glass compositions are found to be (0.48 0.02), (0.40 f 0.02), and (0.50 f 0.02) eV. ') Karachi 75270, Pakistan. 32*

A Comparable Study of Structural, Dielectric and Humidity Sensing Properties of Solution Combustion Synthesized ZrO2 and ZrTiO4 Nano Powders

“…The AC conductivity of ZrTiO4 was found to be strongly depending on frequency. It has been reported that dispersion in the conductivity is a direct evidence for the hopping motions of charge carriers in neighboring lattice imperfections [20][21][22]. At low frequencies, conductivity is found to be very small flat peak supporting space charge polarization.…”