Dielectric relaxation and a.c. conductivity of titanium-substituted iron in boron-based glasses

被引：6

作者：

Mostafa, AG ^{[1
]}

Abdel-Wahab, F

Yahya, GA

机构：

[1] Al Azhar Univ, Fac Sci, Dept Phys, Cairo 11884, Egypt

[2] S Valley Univ, Fac Sci, Dept Phys, Aswan, Egypt

来源：

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS | 2002年 / 13卷 / 12期

关键词：

Correlated barrier hopping - Large polaron tunneling models;

D O I：

10.1023/A:1021517122268

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The a.c. conductivity and dielectric properties of the glass system B2O3-BaO-Pb3O4-Fe2O3-TiO2 have been investigated for different Fe2O3-TiO2 ratios, while the content of B2O3, BaO, and Pb3O4 were kept constant and equal to 60, 20, and 5 mol%, respectively. The results of the a.c. conductivity could be explained in terms of the correlated barrier hopping and the overlapping large-polaron tunneling models. The dielectric properties have also been investigated considering the dipolar relaxation model. A good agreement between the experimental data and the Cole-Cole equation have been obtained. The addition of small amounts of TiO2 strongly affected the dielectric properties of the glasses under investigation. (C) 2002 Kluwer Academic Publishers.

引用

页码：721 / 725

页数：5