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
收藏
页码：721 / 725
页数：5
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