The influence of aluminium on the overall properties of SnO2-based varistors

被引：2
|
作者：
Parra, Rodrigo
Maniette, Yves
Varela, Jose A.
Castro, Miriam S.
机构：
[1] UNMdP, CONICET, INTEMA, Inst Invest Ciencia & Tecnol Mat, Mar Del Plata, Argentina
[2] UNESP, Inst Quim, BR-14801970 Araraquara, Brazil
来源：
JOURNAL OF MATERIALS SCIENCE | 2007年 / 42卷 / 13期
基金：
巴西圣保罗研究基金会;
关键词：
D O I：
10.1007/s10853-006-0749-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of aluminium on the development of the microstructure and on the electrical behaviour of the SnO2 center dot Co3O4 center dot Nb2O5 typical varistor system was studied. Two sources of Al were used, alumina (Al2O3) and boehmite (AlO(OH)). The microstructural features were characterised with scanning (SEM) and transmission (TEM) electron microscopies. The different phases present in the studied samples were also studied with XRD, EDS and electron diffraction patterns of selected areas (SAED). Particles containing Sri, Co, Al, and O were unveiled with TEM. Impedance spectroscopy measurements and current density versus electric field characteristics revealed superior electrical properties for samples with AlO(OH). The higher non-linearity (alpha = 19) was achieved with the addition of 0.1% mol of boehmite. The influence of the secondary phases on the electrical properties is also addressed in this work.
引用
收藏
页码：4832 / 4837
页数：6
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