Accession Number : AD0294804

Title :   INORGANIC DIELECTRICS RESEARCH

Corporate Author : NEW JERSEY CERAMIC RESEARCH STATION NEW BRUNSWICK

Personal Author(s) : SMOKE, E.J. ; PHILLIPS, C.J.

Report Date : 01 NOV 1962

Pagination or Media Count : 1

Abstract : Pulverized BaTiO3 glass specimens were fired in an O atmosphere which resulted in raising the bulk density to 5.64 g/cc. An impurity level study was conducted to determine the contamination added by processing. No more than 0.1% impurities was added to the 99.8% pure BaTiO3. A study of the electrical hysteresis vs. temperature, and structure vs. temperature, is presented proving that the structural Curie temperature is at 120 C while the dielectric Curie temperature is at approximately 150 C. Deterioration of the electrical properties of hot pressed BN was studied. A furnace capable of being fired up to 1900 C using H or an inert atmosphere was constructed. It utilizes induction heating. Alumina specimens fired to date reached 98% of true density, and theoretical density should be produced when higher temperature firings are accomplished. Several procedures for preparing lanthanum alumino silicate dielectrics are discussed. A procedure was devised by which the compositions are prereacted, reduced to a fabricating particle size, specimens prepared and fired to maturity. A second firing is being utilized to develop low loss characteristics. (Author)

Descriptors :   *CERAMIC MATERIALS, *DIELECTRICS, ADDITIVES, ALUMINUM COMPOUNDS, BARIUM COMPOUNDS, BORON COMPOUNDS, CRYSTALS, DENSITY, DIELECTRIC PROPERTIES, FERROELECTRIC CRYSTALS, FERROELECTRIC MATERIALS, GLASS, IMPURITIES, INSULATION, MATERIALS, LABORATORY FURNACES, LANTHANUM COMPOUNDS, MANUFACTURING, NITRIDES, OXIDES, SILICON COMPOUNDS, TITANATES.

Distribution Statement : APPROVED FOR PUBLIC RELEASE