Hexagonal Ferrite에 관한 연구 (III)

In order to prepare ferroxplana ZnY (Ba₂Zn₂Fe 12 O 22 ), which would be useful for GHz-band communication, the optimum coprecipitation condittion of 1 BaCl₂-1 Zn(NO₃)₂-6 FeCl₃ in NaOH-Na₂CO₃ solution was investigated by use of a new apparatus invented in our laboratory. By freeze-drying and calcining the coprecitated hydroxide-carbonate, the very reactive powder was obtained, from which the synthesis process of ZnY and the other related crystals were investigated by means of X-ray diffraction. In results, it was found that the reactive powder containing ZnY as the major component can be prepared by this method, which may be used in manufacturing the various magnetic cores for the microwave communication.