AC conductivity and dielectric properties of SiO2-Na2O-B2O3-Gd2O3 glasses

被引:65
作者
Mahani, Ragab M. [1 ]
Marzouk, Samir Y. [2 ]
机构
[1] Natl Res Ctr, Microwave Phys & Dielect Dept, Cairo 12311, Egypt
[2] Arab Acad Sci & Technol, Fac Engn, Cairo, Egypt
关键词
Borosilicate glass; Gadolinium oxide; Permittivity; Conductivity; IONIC TRANSPORT; ELECTRICAL-CONDUCTIVITY; RELAXATION; TRANSITION; DIFFUSION; LITHIUM; CERIUM; GD;
D O I
10.1016/j.jallcom.2013.05.173
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The present paper studies the dielectric properties and ac conductivity of sodium borosilicate glasses doped with varying concentrations of Gd2O3, while maintaining the SiO2:Na2O:B2O3 ratios constant for all compositions. The samples were prepared using rapid quenching method. Their dielectric and electrical properties were measured in the frequency range (10(2)-10(6) Hz) and temperature range (298-523 K). Experimental results showed that all dielectric and electrical properties are dominated by mole% of Gd2O3. The decrease and increase in these properties were found to be due to formation of short range ordered structure and non-bridging oxygen, respectively. Different models were suggested to describe the conduction mechanism of the investigated compositions based on mole% of Gd2O3. Correlated barrier hopping model (CBH) was suggested to describe the conduction mechanism of 0-2.52 mole% Gd2O3 doped - samples. While, overlapping large polaron tunneling (OLPT) model was applied to describe conductivity of 2.83 mole% Gd2O3 doped sample. Interestingly, an inverse - OLPT model was suggested to describe the conduction mechanism of composition doped with 3.13 mole% of Gd2O3. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:394 / 400
页数:7
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