The Semi-Quantitative Study of Magnetization Process on Milling and Reannealing of Barium Hexaferrite (BaO.6Fe2O3)

Ridwan, Ridwan and Mujamilah, Mujamilah and Johan, Akmal (2009) The Semi-Quantitative Study of Magnetization Process on Milling and Reannealing of Barium Hexaferrite (BaO.6Fe2O3). Atom Indonesia, 35 (2). pp. 105-113. ISSN 0126-1568

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Abstract

THE SEMI-QUANTITATIVE STUDY OF MAGNETIZATION PROCESS ON MILLING AND REANNEALING OF BARIUM HEXAFERRITE (BaO.6Fe2O3). Barium hexaferrite (BaO.6Fe2O3) is as a hard magnetic material with good chemical stability which has been intensively used as permanent magnet components. Many works have been done in order to improve their magnetic properties either through chemical process or powders metallurgy technique. In this work, commercial BaO.6Fe2O3 was milled using high-energy milling machine for 10, 20 and 30 hours and followed by reannealing for 3 hours at 1000⁰C in air. X-ray diffraction pattern indicate no phase decomposition occurred caused the mill processing, annealing of milled powders recovered the crystal system and promoted crystallite growth. The magnetic hysteresis curve measured by vibrating sample magnetometer (VSM) shows the coercivity of annealed BaO.6Fe2 O3 increases to two times higher than the original one. By using Jiles-Atherton model, all the hysteresis parameters Ms, k, α, a and c, have been determined adopted to the Genetic Algorithm (GA). The analyzed hysteretic parameters obtained from this work is congruent to the change of magnetic properties of as-milled and annealed powders of barium hexaferrite

Item Type:	Article
Uncontrolled Keywords:	Barium hexaferrite, high-energy milling, magnetic properties, J-A model, XRD, VSM
Subjects:	#3 Repository of Lecturer Academic Credit Systems (TPAK) > Articles Access for TPAK (Not Open Sources)
Divisions:	08-Faculty of Mathematics and Natural Science > 45201-Physics (S1)
Depositing User:	Akmal Johan
Date Deposited:	14 Jun 2023 07:27
Last Modified:	14 Jun 2023 07:27
URI:	http://repository.unsri.ac.id/id/eprint/108836

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