Electrical properties of glasses in the systems Bi2O3-RO-Li2O (R = Ca, Sr, Ba)

摘要

A number of studies have been devoted to the investigation of the glass-forming tendency and physical properties of Bi2C>3-based glasses [1 -3], Interest in these glasses stems from their excellent optical properties: a long wavelength cutoff beyond 9 ftm and high third-order nonlinear optical susceptibility. These glasses are also of much interest from the point of view of glass structure because they do not contain any conventional network formers such as SiO2, B2O 0' P2O5. Recently, while exploring BbO.i-based glasses for optical applications, the author found new glass-forming regions existing in the systems Bi20.rR0-LbO (R = Ca, Sr, Ba) [4|. Surprisingly, the glassy region in every system was very large and glasses containing LJ2O content as high as 70 mol % could be obtained readily. Many studies have shown thai increasing the concentration of lithium ions results in higher conductivity [5, 6]. It is, therefore, of interest to investigate the conductivity of the present glasses. On the other hand, the BiiG-based glasses also possess high dielectric constants clue to the high polarizability of Bi31 ions [2, 7], so it is also of interest to study how the UTO content affects the dielectric property. In this letter the composition dependence of both the electrical conductivity and the dielectric constant are presented.