The Orientation Study of Ba-Sr Hexaferrite Particles by Parallel Magnetic Field Press

Abstract:

It is well known that an orientation treatment on magnetic particles may increase magnetic flux density than that of those without treatment. In this work, the study on orientation of Barium Stronsium Hexaferrite (Ba-Sr Hexaferrite) particles using parallel system of magnetic field press was conducted to investigate the effect of powder orientation on its characteristic. Samples were compacted while the varied magnetic field induction were given, molded and then sintered at 1200°C for 1 hour. The measurement of magnetic properties showed that orientation process increased the value of magnetic remanence up to 173% (1264 Gauss). The magnetic field induction of 0.4 T was found to be the optimum value, where further increase of magnetic field did not give significant change. The crystal structure analysis showed the increase of peak of <001> plane which is correlated with the c-axis of Ba-Sr Hexaferrite crystal. In addition, the peak which is correlated with the opposite direction of c-axis disappeared, while the peaks between those directions decreased significantly. The micrograph of Ba-Sr Hexaferrite particles showed the alignment of c-axis parallel to the given magnetic field induction. These results showed the phenomenon of mechanical particle revolving and particle arrangement during the orientation process by which determined the obtained magnetic remanence.

• Periodical: Materials Science Forum (Volume 827)
• Pages: 223-228
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.827.223
• Online since: August 2015
• Authors: Agus Sukarto Wismogroho*, Wahyu Bambang Widayatno, Toto Sudiro, Didik Aryanto
• Keywords: Ba-Sr Hexaferrite, Magnetiec Field Press, Orientation

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