THE MANUFACTURE, CHARACTERIZATION AND MICROWAVE PROPERTIES OF ALIGNEDM FERRITE FIBERS

Gel fibres of strontium and barium M ferrite were blow spun from an aq ueous inorganic sol and collected as aligned tow blankets. Both were t hen calcined to 1000 degrees C and characterised using a variety of te chniques. The ceramic fibres were shown to be the respective single ph ase crystalline M ferrites at 1000 degrees C by X-ray diffraction, and compared to standard commercially available M ferrites at this temper ature they demonstrated a favourable grain structure of less than 1 mu m. Measurement of the microwave permeability spectra showed both mate rials exhibiting ferromagnetic resonance frequencies consistent with t hose reported in the literature. (C) 1998 Elsevier Science B.V. All ri ghts reserved.