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Growth of self-textured barium hexaferrite ceramics by normal sintering process and their anisotropic magnetic properties

Title
Growth of self-textured barium hexaferrite ceramics by normal sintering process and their anisotropic magnetic properties
Authors
CHOI, SI YOUNGV. AnnapureddyJ. -H. KangH. PalneediJ. -W. KimC. -W. AhnS. D. JohnsonJ. Ryu
POSTECH Authors
CHOI, SI YOUNG
Date Issued
Dec-2017
Publisher
ELSEVIER SCI LTD
Abstract
In this report a simple and low-cost technique for growing highly textured barium hexaferrite ceramics without the need for flux or seed crystals to achieve grain orientation is demonstrated. Plate-like shaped barium hexaferrite particles were synthesized using a solid-state reaction process and then aligned under a weak magnetic field, followed by uniaxial compaction. The aligned hexaferrite particles appear to serve as seeds, forming textured grains during sintering. The development of texture was verified by X-ray diffraction (XRD), electron backscatter diffraction (EBSD), and vibration sample magnetometer (VSM) measurements. The prepared high-quality hexaferrite ceramics exhibited good anisotropic magnetic properties, comparable to those of single crystal counterparts. A mechanism for the formation of the self-textured grain growth of the barium hexaferrite ceramics, which involves grain boundary and lattice diffusion and interface reaction processes, is proposed. (C) 2017 Elsevier Ltd. All rights reserved.
In this report a simple and low-cost technique for growing highly textured barium hexaferrite ceramics without the need for flux or seed crystals to achieve grain orientation is demonstrated. Plate-like shaped barium hexaferrite particles were synthesized using a solid-state reaction process and then aligned under a weak magnetic field, followed by uniaxial compaction. The aligned hexaferrite particles appear to serve as seeds, forming textured grains during sintering. The development of texture was verified by X-ray diffraction (XRD), electron backscatter diffraction (EBSD), and vibration sample magnetometer (VSM) measurements. The prepared high-quality hexaferrite ceramics exhibited good anisotropic magnetic properties, comparable to those of single crystal counterparts. A mechanism for the formation of the self-textured grain growth of the barium hexaferrite ceramics, which involves grain boundary and lattice diffusion and interface reaction processes, is proposed. (C) 2017 Elsevier Ltd. All rights reserved.
Keywords
Self-texture; EBSD; Barium hexaferrite; Pole figure
URI
http://oasis.postech.ac.kr/handle/2014.oak/38951
DOI
10.1016/j.jeurceramsoc.2017.05.028
ISSN
0955-2219
Article Type
Article
Citation
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, vol. 37, no. 15, page. 4706, 2017-12
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