Magnetic Co2Y ferrite, Ba2Co2Fe12O22 fibres produced by a blow spun process

Gel fibres of Co2Y, Ba2Co2Fe12O22, were blow spun from an aqueous inorganic sol and calcined at temperatures of up to 1200 degrees C. The ceramic fibres were shown by X-ray diffraction to form crystalline Co2Y at 1000 degrees C, and surface area and porosity measurements indicated an un usually high degree of sintering at this temperature. The fibres also demonstrated a small grain size of 1-3 mu m across the hexagonal plane and 0.1-0.3 mu m thickness at 1000 degrees C. This only increased 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 microstructures could be an important factor in improving the magnetic properties of this material.