ABSTRACT
Chapter 6 examines the conduction mechanisms of pure tellurite glass; tellurite glasses containing transition metal, rare-earth, or alkaline components-oxide and nonoxide forms-and tellurite glassceramics. The effects of different temperature ranges, pressures, energy frequencies, and modi‡ers on AC and DC electrical conductivity in tellurite-based materials are summarized. Theoretical considerations and analyses of the electrical properties and conductivity of tellurite glasses and glassceramics based on their “hopping” mechanism are compared in high-, room, and low-temperature conditions. This chapter explores the dependence of the semiconducting behavior of tellurite glasses on the ratio of low-to high-valence states in their modi‡ers, on activation energy, and on electronphonon coupling. Ionic properties of tellurite glasses are also summarized. Chapter 6 clearly shows that electrical-conduction parameters in tellurite-based materials are directly affected by temperature, frequency, and pressure, as well as by the kinds and percentages of modi‡ers. Most of the new data on the electrical properties of tellurite glasses are collected.
