GRAIN SIZE EFFECTS ON SWITCHING PROPERTIES OF LITHIUM FERRITES.
Research and development technical rept.,
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
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The study was made to determine the effects of grain size on the switching properties of lithium ferrite. Lithium ferrite Li.5Fe2.5O4 powders were prepared by five different techniques which were freeze drying, flame spraying, standard commercial processing, fluid-bed reaction, and reaction of Li2CO3Fe2O3 mixture. These powders were densified by hot pressing or conventional sintering. Except for the freeze-dried powder, their magnetic properties were similar for a given grain size, but their densification and grain growth characteristics varied greatly. The magnetic properties evaluated as a function of grain size were coercive force, switching speed, switching constant, squareness, and temperature stability. These properties were evaluated over a 0.7 to 16.0 micron grain size range and the effects of grain size on switching speed and coercive force were established. It is shown that samples with a 5.0 micron grain size have more than a two times faster switching speed with little or no increase in coercive force, when compared with 16.0 micron grain size samples. Author
- Electrical and Electronic Equipment