Effects of processing chemistry on electrical properties of high field ZnO varistors
Abstract
High-field ZnO-based varistors (10 less than or equal to E less than or equal to 100 kV/cm at J = 5A/cm(2)) with nonlinearity coefficients ((ALPHA)) greater than 30 were fabricated by sintering chemically prepared precursor powders at 675 to 740(0)C in air. The chemistry used is discussed and related to precursor powder morphology and to microstructural and electrical properties of varistors. The zinc salts used as the starting material and the aging time of the hydroxide coprecipitate prior to conversion to the oxalate form are also discussed.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- 1985
- Bibcode:
- 1985STIN...8528254D
- Keywords:
-
- Electrical Properties;
- Fabrication;
- Sintering;
- Varistors;
- Zinc Oxides;
- Bismuth Oxides;
- Cobalt Oxides;
- High Temperature;
- Manganese Oxides;
- Powder Metallurgy;
- Resistors;
- Semiconductor Devices;
- Electronics and Electrical Engineering