Direct synthesis of varistor-grade doped nanocrystalline ZnO and its densification through a step-sintering technique

被引：74

作者：

Anas, S.

Mangalaraja, R. V.

Poothayal, Mukundan

Shukla, Sanjeev K.

Ananthakumar, S. ^{[1
]}

机构：

[1] CSIR, Mat & Minerals Div, Trivandrum 695019, Kerala, India

[2] Univ Concepcion, Dept Mat Engn, Concepcion, Chile

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 17期

关键词：

direct synthesis; doped zinc oxide; step-sintering; reflux; composite varistors;

D O I：

10.1016/j.actamat.2007.06.047

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A direct synthesis of varistor-grade doped ZnO powder was attempted by simple hydrolysis followed by low-temperature refluxing (80 degrees C) in aqueous and alcoholic media. Rod like, one-dimensional nanocrystalline (loped ZnO powders with crystallite size 24 nm and Brunauer-Emmett-Teller (BET) bulk surface area 22 m(2) g(-1) were synthesized. Sintering characteristics of these powders were analyzed under step-sintering coupled with rapid heating up to 1050 degrees C. The micro structural features and I-V characteristics of the step-sintered doped ZnO were compared with composite varistors. The study shows the advantage of the addition of nanosize doped varistor-grade ZnO as well as step-sintering for controlling grain size and improving varistor performance. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：5792 / 5801

页数：10

共 29 条

[1] Effect of rate controlled sintering on microstructure and electrical properties of ZnO doped with bismuth and antimony oxides [J].