PHYSICOCHEMICAL AND STRUCTURAL FEATURES OF MONOCRYSTALLINE AND POLYCRYSTALLINE MANGANESE-ZINC FERRITES

Studies carried out using various methods - x-ray structural and spect ral, electromagnetic, gravimetric, nuclear gamma-resonance, and nuclea r magnetic resonance - revealed that the cryst-chemical structure of m ono- and polycrystalline manganese-zinc ferrites used in video tape re corders and color television sets possess defects, with various degree s of localization (point, plane, nd cluster), existing simultaneously in both the cation and anion sublattices. Differences in the structure of mono- and polycrystalline specimens were observed, but the specime ns were similar with respect to the nature of the clustered defects. A relationship between the defect structure and specified electromagnet ic properties of the ferrites was established. It is concluded that mo re information is needed concerning the actual crystal-chemical struct ure of ferrites containing defects of different types and dimensions ( micro, meso, macro).