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Title: A process for the chemical preparation of high-field ZnO varistors

Abstract

Chemical preparation techniques involving co-precipitation of metals are used to provide microstructural characteristics necessary in order to produce ZnO varistors and their precursors for high field applications. The varistors produced have homogeneous and/or uniform dopant distributions and a submicron average grain size with a narrow size distribution. Precursor powders are prepared via chemical precipitation techniques and varistors made by sintering uniaxially and/or isostatically pressed pellets. Using these methods, varistors were made which were suitable for high-power applications, having values of breakdown field, E/sub B/, in the 10 to 100 kV/cm range, ..cap alpha.. > 30 and densities in the range of 65 to 99% of theoretical, depending on both composition and sintering temperature.

Inventors:
; ;
Issue Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
OSTI Identifier:
6727387
Application Number:
ON: DE87007299
Assignee:
Dept. of Energy
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; SEMICONDUCTOR RESISTORS; PRODUCTION; ZINC OXIDES; CHEMICAL PREPARATION; ADDITIVES; BISMUTH OXIDES; COBALT OXIDES; DOPED MATERIALS; MANGANESE OXIDES; POWDERS; PRECIPITATION; SINTERING; BISMUTH COMPOUNDS; CHALCOGENIDES; COBALT COMPOUNDS; ELECTRICAL EQUIPMENT; EQUIPMENT; FABRICATION; MANGANESE COMPOUNDS; MATERIALS; OXIDES; OXYGEN COMPOUNDS; RESISTORS; SEMICONDUCTOR DEVICES; SEPARATION PROCESSES; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS; ZINC COMPOUNDS; 420800* - Engineering- Electronic Circuits & Devices- (-1989); 360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Brooks, R A, Dosch, R G, and Tuttle, B A. A process for the chemical preparation of high-field ZnO varistors. United States: N. p., 1986. Web.
Brooks, R A, Dosch, R G, & Tuttle, B A. A process for the chemical preparation of high-field ZnO varistors. United States.
Brooks, R A, Dosch, R G, and Tuttle, B A. Wed . "A process for the chemical preparation of high-field ZnO varistors". United States.
@article{osti_6727387,
title = {A process for the chemical preparation of high-field ZnO varistors},
author = {Brooks, R A and Dosch, R G and Tuttle, B A},
abstractNote = {Chemical preparation techniques involving co-precipitation of metals are used to provide microstructural characteristics necessary in order to produce ZnO varistors and their precursors for high field applications. The varistors produced have homogeneous and/or uniform dopant distributions and a submicron average grain size with a narrow size distribution. Precursor powders are prepared via chemical precipitation techniques and varistors made by sintering uniaxially and/or isostatically pressed pellets. Using these methods, varistors were made which were suitable for high-power applications, having values of breakdown field, E/sub B/, in the 10 to 100 kV/cm range, ..cap alpha.. > 30 and densities in the range of 65 to 99% of theoretical, depending on both composition and sintering temperature.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {2}
}