ULTRA-FINE PARTICLE SIZE FERROELECTRICS.
Abstract
Four schemes for producing BaTiO3 of small controlled particle sizes were examined. Ball milling and fractional sedimentation were abandoned when it appeared unlikely that suitable quantities could be produced. Hydrolysis of organic titanates with soluble Ba compounds produced particle sizes of 0.01 to 0.02 micron in small quantities and 0.06 to 1.2 microns in larger experimental runs. Through pyrolysis of barium titanyl oxalate particle sizes down to 0.04 micron were readily achieved. Compositions of CaBaTiO3 were synthesized by preparing the mixed titanyl oxalate and pyrolyzing it. The Ca substitutions increased the dielectric strength by more than 50%. Use of a BaTiO3 dispersion in an organic, film-forming binder permitted the casting of 10 to 100-micron films on plate glass. After air drying, the material was stripped from the glass and fired to form dense, pinholefree plates of BaTiO3. The capacitance of two BaTiO3 samples decreased 15 and 25% between room temperature and 180 C. The dissipation factor of one was below 1.5% and the other below 3% up to 180C. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 14, 1964
- Accession Number
- AD0442545
Entities
People
- Jules Magder
- Klara Kiss
- Richard A. Fotland
- Robert J. Lockhart
- Theodore M. Harkulich