STABLE FERRITES FOR R.F. APPLICATIONS.
Quarterly rept. no. 6, 1 Oct-31 Dec 65,
INDIANA GENERAL CORP KEASBEY NJ RESEARCH DEPT
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A formulation of MF-9304, the basic material being developed for this contract, was prepared with an addition of approximately 10 weight of a silicate mineral called bentonite. Results presented were verified by additional measurements. Also, the instability factors such as dis-accommodation, d.c. field and a.c. drive effects were easured. An upper useful frequency uuf of 19.7 Mcs and uuf. mu sub oQ product of 59000 were found. Instability effects concerning mu sub o were found to be TF 2.5 PPMC, DAF 20.8 PPM, d.c. field 0.48, and a.c. drive 0.22. A factor for total instability called IF was determined and its value is 1.7 for this bentonite containing material MF-9353-S. For MF-9304 the value of IF was 10.7. Reproducibility studies on new firings of the original hatch of material and on a new batch of material were made and in regard to mu sub o, Q and TF the results were equivalent to or better than those obtained on the initial samples. Other instability factors on the new batches have to be studied yet.
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