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

Abstract

Chemical preparation techniques involving co-precipitation of metals are used to provide micro-structural 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 10-100 kV/cm range, .alpha.>30 and densities in the range of 65-99% of theoretical, depending on both composition and sintering temperature.

Inventors:
 [1];  [2];  [2]
  1. (Tijeras, NM)
  2. (Albuquerque, NM)
Publication Date:
Research Org.:
AT & T CORP
OSTI Identifier:
866313
Patent Number(s):
US 4681717
Assignee:
United States of America as represented by United States (Washington, DC) SNL
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
process; chemical; preparation; high-field; zno; varistors; techniques; involving; co-precipitation; metals; provide; micro-structural; characteristics; produce; precursors; field; applications; produced; homogeneous; uniform; dopant; distributions; submicron; average; grain; size; narrow; distribution; precursor; powders; prepared; via; precipitation; sintering; uniaxially; isostatically; pressed; pellets; methods; suitable; high-power; values; breakdown; 10-100; kv; cm; range; alpha; 30; densities; 65-99; theoretical; depending; composition; temperature; narrow size; average grain; structural characteristics; size distribution; grain size; precursor powder; precursor powders; isostatically pressed; sintering temperature; field applications; chemical preparation; zno varistors; via chemical; power applications; prepared via; /264/252/

Citation Formats

Brooks, Robert A., Dosch, Robert G., and Tuttle, Bruce A. Process for the chemical preparation of high-field ZnO varistors. United States: N. p., 1987. Web.
Brooks, Robert A., Dosch, Robert G., & Tuttle, Bruce A. Process for the chemical preparation of high-field ZnO varistors. United States.
Brooks, Robert A., Dosch, Robert G., and Tuttle, Bruce A. Thu . "Process for the chemical preparation of high-field ZnO varistors". United States. https://www.osti.gov/servlets/purl/866313.
@article{osti_866313,
title = {Process for the chemical preparation of high-field ZnO varistors},
author = {Brooks, Robert A. and Dosch, Robert G. and Tuttle, Bruce A.},
abstractNote = {Chemical preparation techniques involving co-precipitation of metals are used to provide micro-structural 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 10-100 kV/cm range, .alpha.>30 and densities in the range of 65-99% of theoretical, depending on both composition and sintering temperature.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {1}
}

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