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Properties of anisotropic Ba‐Zn‐Cu system W‐type hexagonal ferrite magnets
Author(s) -
Yamamoto Hiroshi,
Suzuki Koichi
Publication year - 2001
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/1520-6416(200103)134:4<36::aid-eej5>3.0.co;2-o
Subject(s) - materials science , lattice constant , hexagonal crystal system , sintering , magnet , ferrite (magnet) , analytical chemistry (journal) , anisotropy , metallurgy , crystallography , composite material , chemistry , diffraction , physics , optics , chromatography , quantum mechanics
Experiments were carried out to investigate the magnetic and physical properties of Ba‐Zn‐Cu W‐type hexagonal ferrites sintered without atmosphere control. Compositions were chosen according to the formula BaZn 2–x Cu x Fe 16 O 27 , where x was varied 0 ˜ 0.5 and 1.0. The effect of BaO addition after semisintering treatment on magnetic properties of Ba‐Zn‐Cu compounds was examined. It was found that BaO addition for Ba‐Zn‐Cu compounds was very useful in stabilizing the W‐type hexagon. The optimum condition of making magnets and some properties of typical specimens are as follows: composition—BaZn 1.7 Cu 0.3 Fe 16 O 27 with 4 wt% Ba added; semisintering conditions—1275 °C for 1.0 h in air; sintering conditions—1175°C for 0.5 h in air; magnetic properties and lattice constant are J m = 0.405 T, J r = 0.370 T, H cJ = 88.15 kA/m, (BH) max = 19.12 kJ/m 3 , T c = 356 °C, H A = 994.7 kA/m, K A = 2.01 × 10 5 J/m 3 , c = 32.928 × 10 –10 m, a = 5.927 × 10 –10 m, c/a = 5.556. © 2001 Scripta Technica, Electr Eng Jpn, 134(4): 36–42, 2001