Structural, Magnetic, and X-Band Microwave Absorbing Properties of Ni-Ferrites Prepared Using Oxidized Mill Scales

  Ardita Septiani (1*), Novrita Idayanti (2), Tony Kristiantoro (3), Dedi Mada (4), Nadya Larasati Kartika (5), Dadang Mulyadi (6), Asep Rusmana (7), Pepen Sumpena (8)

(1) Indonesian Institute of Sciences - Indonesia
(2) Indonesian Institute of Sciences - Indonesia
(3) Indonesian Institute of Sciences - Indonesia
(4) Indonesian Institute of Sciences - Indonesia
(5) Indonesian Institute of Sciences - Indonesia
(6) Indonesian Institute of Sciences - Indonesia
(7) Indonesian Institute of Sciences - Indonesia
(8) Indonesian Institute of Sciences - Indonesia
(*) Corresponding Author

Received: November 15, 2020; Revised: December 16, 2020
Accepted: March 15, 2021; Published: August 31, 2021

How to cite (IEEE): A. Septiani, N. Idayanti, T. Kristiantoro, D. Mada, N. L. Kartika, D. Mulyadi, A. Rusmana,  and P. Sumpena, "Structural, Magnetic, and X-Band Microwave Absorbing Properties of Ni-Ferrites Prepared Using Oxidized Mill Scales," Jurnal Elektronika dan Telekomunikasi, vol. 21, no. 1, pp. 27-34, Aug. 2021. doi: 10.14203/jet.v21.27-34


This study aims to evaluate the structural, magnetic, and microwave absorbing properties at the X-band region of oxidized mill scales as by-product derived from a steel making process by means of a facile solid-state reaction. The oxidized mill scales were heated at 600 °C for 4 h followed by mixing with NiO. A calcination process took place at 900 °C and sintering process were conducted at 1260 °C with a milling process conducted in between the heating process. X-ray diffraction (XRD) and scanning electron microscope (SEM) equipped with energy dispersive spectrometer (EDS) were employed to evaluate the structural properties of the Ni-ferrites samples. Remacomp measurement were conducted to evaluate the magnetic properties and vector network analyzer (VNA) to measure its microwave properties. A single phase of NiFe2O4 was confirmed by XRD data. The site occupancies derived from the Rietveld refinement shows that the Ni:Fe:O ratio deviates from the 1:2:4 ratio as that suggests vacancies formed in the Ni2+ and Fe3+ that lowers the unit cell density to 5.08 g/cm3 that further confirmed by EDS measurement. The coercivity of 11 kOe is also higher than the bulk NiFe2O4¬ prepared by the chemical grade raw materials. The reflection data of the microwave properties at X-band of 8-12 GHz do not shows significant absorptions. This study suggests that the selected preparation method yields a single phase, however with the significant crystallographic defects and has less ‘soft’ magnetic properties compared to NiFe2O4 prepared using chemical grade by previous study.



Spinel ferrites; mill scales; soft magnets; magnetic materials

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