DEVELOPMENT OF ADVANCED MICROWAVE COMPONENTS AND TECHNIQUES-PLANAR HEXAGONAL FERRITES AND DEVICES.
Abstract
A series of Y compounds was selected as potentially offering a suitable range of anisotropy fields and linewidths for the device studies contemplated. Within this series the iron stoichiometry was varied to determine its effect on dielectric loss tangent. Also in this series, a partial substitution of aluminum for iron was made to observe its effect on the saturation magnetization of the end product. The first ten batches so prepared showed abnormally high dielectric loss tangents. This excessive loss is believed to be due to a loss of barium in the preparation process, and tended to override any effects due to varying iron stoichiometry. A variety of carriers (water, Kyso 45, and ethyl alcohol) were tried with and without additives in an effort to eliminate this barium loss. While there was some indication of an improvement in loss tangent through the use of Kyso 45, there was also substantial evidence that the alignment of individual crystallites within the ceramic was degraded. Best combinations of alignment and low loss tangents were obtained in materials prepared with ethyl alcohol as a carrier. Alignment factors as high as .99 have been achieved on materials having loss tangents of the order of .015. There is evidence to indicate that these loss tangents could be further reduced by lowering the firing temperature of the materials. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1963
- Accession Number
- AD0422600
Entities
Organizations
- Sperry Corporation