Sintesis dan Karakterisasi Serbuk BaFe
12O
19dengan Aditif FeMo
Melalui Metode Mechanical Alloying
ABSTRAK
Telah dilakukan sintesis serbuk BaFe12O19 dengan penambahan aditif FeMo (1, 3,
5, 7, dan 9%wt) melalui metode mechanical alloying dan variasi temperatur kalsinasi 1000, 1100, dan 1200 oC (2 jam). Karakterisasi yang dilakukan pada serbuk meliputi: true density, Optical Microscope (OM), Vibrating Sample Magnetometer (VSM), dan X-Ray Diffraction (XRD). Hasil karakterisasi true density sebelum kalsinasi menghasilkan nilai berkisar 3,22 - 4,61 x 10 -3 kg/ m3 dan hasil karakterisasi Optical Microscope (OM) menghasilkan nilai 106 – 92 nm.
Hasil analisis VSM dengan penambahan 5%berat FeMo adalah σs= 50,49 (4π x
10-7) Wb.m/kg; σr = 23,83 (4π x 10-7) Wb.m/kg; jHc = 1106 (103/4π) A/m; dan
BHmax = 137 (10-1/4π) J/m3 dan merupakan nilai yang optimum. Serbuk
BaFe12O19 dengan penmbahan 5%wt FeMo yang dikalsinasi pada temperatur
1000oC (β jam) menghasilkan σs = γ1,56 (4π x 10-7) Wb.m/kg; σr = 17,17 (4π x
10-7) Wb.m/kg; jHc = 445,36 (103/4π) A/m dan BHmax = 8,66 (10-1/4π) J/m3 dan
merupakan nilai optimum. Dari hasil analisis XRD serbuk tersebut diperoleh 59,2% fasa barium heksaferit (BaFe12O19), 24,11% fasa hematit (Fe2O3), dan
16,67% fasa barium oxide (BaO) dengan struktur kristal heksagonal,trigonal, dan tertagonal. Bahan serbuk ini termasuk semihard magnetic dan memungkinkan untuk digunakan sebagai bahan sensor magnetik.
Kata Kunci: BaFe12O19, FeMo, Mechanical Alloying, Kalsinasi, Vibrating Sample
Magnetometer.
Synthesis and Characterization of BaF e
12O
19powder with F eMo
Additive by Mechanical Alloying Method
ABSTRACT
BaFe12O19 powder with FeMo (1, 3, 5, 7, dan 9%wt) additive has been synthesis
by mechanical alloying method and variation of calcination at temperature: 1000, 1100, and 1200 oC (2 h). The characterization of powder include: true density, Optical Microscope (OM), Vibrating Sample Magnetometer (VSM), and X-Ray Diffraction (XRD). The characterization result of true density before calcination are 3,22 - 4,61 x 10-3 kg/m3, and the result of Optical Microscope are 106 – 92 nm. VSM analysis results with 5wt% FeMo additive are σs = 50,49 (4π x 10-7)
Wb.m/kg; σr= 23,83 (4π x 10 -7
) Wb.m/kg; jHc = 1106 (10
3/4π) A/m ; and BH max =
137 (10-1/4π) J/m3 is the optimum value. After calcination at 1000oC (2 h)
temperature, the results are σs= 31.56 (4π x 10
-7) Wb.m/kg; σ
r = 17.17 (4π x 10 -7
) Wb.m/kg; jHc = 445.36 (10
3/4π) A/m; and BH
max = 8.66 (10
-1/4π) J/m3
which is the optimum value. XRD analysis showed that the powder BaFe12O19 with 5wt%
FeMo addition has 59.2% barium hexaferrite (BaFe12O19), 24.11% hematite
(Fe2O3), and 16. 67% barium oxide (BaO) phase with hexagonal, trigonal, and
tetragonal crystal structure respectively. This material can be categorized semi-hard magnetic and possibility use for magnetic sensor material.
Keywords: BaFe12O19, FeMo, Mechanical Alloying, Calcination, Vibrating
Sample Magnetometer.
