Accession Number : AD0284357

Title :   FAILURE MECHANISMS IN CERAMIC DIELECTRICS

Corporate Author : ROME AIR DEVELOPMENT CENTER GRIFFISS AFB N Y

Personal Author(s) : GERSON,R.

Report Date : MAR 1962

Pagination or Media Count : 1

Abstract : In this failure study on capacitor-type ceramics, the past contract period has seen the emphasis shift from preparation of ceramics toward testing of the materials under electrical stress. The resistivity is given as a function of temperature for most of the ceramics. All of the materials exhibit similar behavior with respect to temperature, but there is a wide variation in magnitude among the ceramics. In general donor additions increased, and acceptor additions decreased, the resistivity at a given temperature, but the reverse held for barium stron tium titanate. Microphotographs are presented showing the grain structure of the materials. Electrical breakdown tests were also run. A general trend was found toward higher breakdown strength in ceramics having high resistivity and low dielectric constant, but there are considerable deviations from this rule in some ceramics. Long term life testing has also begun, and an example of the results is presented. (Author)

Descriptors :   *CERAMIC CAPACITORS, *CERAMIC MATERIALS, *DIELECTRICS, BARIUM COMPOUNDS, DIELECTRIC PROPERTIES, ELECTRICAL PROPERTIES, LEAD COMPOUNDS, MICROSTRUCTURE, NIOBATES, PREPARATION, RESISTANCE (ELECTRICAL), STRONTIUM COMPOUNDS, TEMPERATURE, TITANATES, ZIRCONATES

Distribution Statement : APPROVED FOR PUBLIC RELEASE