MAGNETIC CO2Y FERRITE, BA2CO2FE12O22 FIBERS PRODUCED BY A BLOW SPUN PROCESS

Gel fibres of Co2Y, Ba2Co2Fe12O22, were blow spun from an aqueous inor ganic sol and calcined at temperatures of up to 1200 degrees C. The ce ramic fibres were shown by X-ray diffraction to form crystalline Co2Y at 1000 degrees C, and surface area and porosity measurements indicate d an un usually high degree of sintering at this temperature. The fibr es also demonstrated a small grain size of 1-3 mu m across the hexagon al plane and 0.1-0.3 mu m thickness at 1000 degrees C. This only incre ased to 3 mu m in diameter and 1 mu m thickness even at temperature up to 1200 degrees C. The fibrous nature combined with the improved micr ostructures could be an important factor in improving the magnetic pro perties of this material.