Preparation and characterization of nanocrystalline ZnO based materials for varistor applications

被引：87

作者：

Viswanath, RN

Ramasamy, S

Ramamoorthy, R

Jayavel, P

Nagarajan, T

机构：

[1] Department of Nuclear Physics, University of Madras, Madras, 600 025, Guindy Campus

来源：

NANOSTRUCTURED MATERIALS | 1995年 / 6卷 / 5-8期

关键词：

D O I：

10.1016/0965-9773(95)00229-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ultra fine zinc oxide powders with the size of crystallites In the range between. 3 and 10 nm have been prepared by colloidal suspension and centrifugal separation method. The powders were characterized by DTA and XRD. The average crystallite size was estimated from the XRD profile width, using Scherrer equation. The crystallite sizes remained in nm scale on heat treatment upto 750 degrees C. Different valence state elements (Go, Sb, B, Bi, Sn & Cu) in oxide form were additively doped with ZnO by dissolution. process for fabrication of varistors. These additives form a continuous thin. layer over the conducting ZnO crystallite surfaces and make the boundary or interface regions insulating. Non-linear exponent, alpha, of approximate to 50 and normalized breakdown voltage approximate to 30 kV cm(-1) were obtained for the varistors made of nanostructured ZnO.

引用

页码：993 / 996

页数：4

共 9 条

[1] NANOCRYSTALLINE MATERIALS AN APPROACH TO A NOVEL SOLID STRUCTURE WITH GAS-LIKE DISORDER [J].