FINE GRAIN DENSE FERRITES.
Abstract
Fine-grained ferrites of cobalt substituted nickel ferrite (Nil-xCoxFe2O4) were hot pressed using powders prepared by flame spraying and ball-milling. An oxygen anneal of the powder prior to hot pressing is an essential step required to reduce the dielectric loss. The hot pressing quality of the flame-sprayed powder was adversely affected by this procedure, whereas the ball-milled powders were not. Several dense samples have been prepared with loss tangents below 0.005, and measurements of threshold fields for subsidiary absorption have been made. A tentative dependence of h(crit) on grain size has been observed; and there is some indication that a two to fourfold increase in power handling capacity can be achieved with grain sizes of the order of one to two microns. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1964
- Accession Number
- AD0453087
Entities
People
- A. E. Paladino
- J. J. Green
- J. S. Waugh
Organizations
- RTX