Journal of Materials Science: Materials in Electronics | 2021
Annealing effects on the structural, thermal, and electrical properties of 10PbTiO3–10Fe2O3–30V2O5–50B2O3 glass
Abstract
Glasses containing lead titanate (PbTiO3) have recently attracted much attention due to its unique electrical properties at high temperature. However, its large lattice anisotropy makes its sinterability difficult. 10PbTiO3–10Fe2O3–30V2O5–50B2O3 glass was prepared by conventional fast quenching technique. The estimated crystallite size after annealing at 773 K for 20 h was 62.6 nm. After annealing, triclinic iron vanadium oxide and monoclinic lead vanadium oxide phases were partially formed. The crystallization temperature (Tc) at different heating rates (β) has been investigated using Kissinger and Ozawa models under non-isothermal mode. The values of various kinetic parameters such as activation energy of crystallization (Ec), rate of crystallization (Kp), Avrami index (n), thermal stability (S), and Hruby number (Hr) have been calculated. The presence of Fe2O3 and PbTiO3 in the glass after annealing was found to enhance its thermal stability and electrical conductivity. The electrical conductivities of as-quenched and annealed glass were evaluated by dc conductivity. The dc conductivity was discussed in terms of small polaron hopping (SPH) mechanism.