INORGANIC DIELECTRICS RESEARCH
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1962
- Accession Number
- AD0294804
Entities
People
- C.j. Phillips
- E.j. Smoke