Microstructure and Magnetic Properties of Ba sub 2 Cu sub 0.8 Zn sub 1.2 Fe sub 12 O sub 22.

摘要

The Y-type hexagonal ferrite Ba sub 2 Cu/sub 0.8/Zn/sub 1.2/Fe sub 12 O sub 22 has been characterized by x-ray diffraction, transmission electron microscopy, analytical electron microscopy, and Lorentz microscopy. Specimens were magnetically oriented so that the c-axes of the hexagonal grains were aligned. The structure was confirmed to have R3m symmetry. The general microstructure consisted of grains about 10 mu m in diameter and 2 mu m in thickness. Intragranular CuZn-ferrite particles were found in some of the grains. The structure of these particles was determined to be diamond cubic with a lattice parameter /approximately/8.4 /angstrom/ and the close-packed plane and the close-packed direction parallel to the close-packed plane and the close-packed direction of the matrix phase. The grains contained faults with the fault plane parallel to the basal plane of the grains. Theoretical calculation showed that domain formation in thin ferrite specimens was very energetically unfavorable. 23 refs., 29 figs., 8 tabs. (ERA citation 13:056996)