Preparation and characterization of Z-type hexaferrites, Ba3(1−x)Sr3x Co2Fe24O41 with x = 0–0.5, via a two-step calcination with an intermediate wet milling |
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Authors: | M. Aoyama J. Temuujin M. Senna T. Masuko C. Ando H. Kishi |
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Affiliation: | (1) Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Yokohama-shi, 223-8522;(2) Materials Research and Development Division, General Research and Development Laboratories, Taiyo Yuden Co. Ltd., 5607-2, Nakamuroda, Gunma, 370-3347 |
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Abstract: | Z-type hexaferrites (Ba3(1 − x)Sr3x Co2Fe24O41with x = 0–0.5, Z-hex) were prepared in a nearly phase pure state by a two-step calcination with an intermediate wet milling. The first calcination of the starting mixture comprising oxides or hydroxides at temperatures below 1100∘C brought about a mixture of layer-structured M and Y-type hexaferrite phases, together with a spinel phase of Co ferrite. Z-hex was fully crystallized after the second calcination up to 1230∘C. Wet milling between the two calcination steps was decisive for the phase purity. Emphasis was laid on the quantitative analyses of Z-hex, together with the evaluation of anisotropic growth of the crystallites. Sr addition stabilizes Z-hex, while decreases degree of anisotropy simultaneously. |
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Keywords: | Ba hexaferrites Z-phase preparation of Wet milling Particle morphology Anisotropic grain growth |
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