Sintesis Nanopartikel Manganese Ferrite (MnFe2O4) dengan Metode Kopresipitasi dan Karakterisasi Sifat Kemagnetannya (Halaman 1 s.d. 7)

Abstract

Abstrak -Telah disintesis nanopartikel magnetit dengan berbagai ukuran butir yang berbeda yang berasal dari bahan MnSO 4 H 2 O dan FeCl 3 .6H 2 O dengan metode kopresipitasi dengan memvariasi parameter suhu dan konsentrasi NaOH. Struktur dan ukuran partikel hasil analisa X-Ray Diffraction (XRD) dan Transmission Electron Microscopy (TEM) menunjukkan bahwa nanopartikel mengkristal dengan baik dan ada ketergantungan ukuran butir nanopartikel terhadap dua variasi parameter sintesis tersebut. Ukuran butir yang dihitung menggunakan persamaan Scherrer menunjukkan bahwa ukuran butir meningkat seiring peninggkatan suhu dan berkurangnya konsentrasi NaOH. Sifat kemagnetan MnFe 2 O 4 hasil analisa Vibrating Sample Magnetometer (VSM). Sampel dengan variasi konsentrasi NaOH, semakin kecil ukuran butir nanopartikel, medan koersivitasnya semakin rendah. Sementara untuk sampel dengan variasi suhu, semakin kecil ukuran butir, medan koersivitasnya semakin tinggi. Hasil VSM juga menunjukkan bahwa semakin tinggi kristalinitas sampel, nilai magnetisasi saturasinya semakin tinggi. Dengan demikian dapat disimpulkan bahwa ukuran butir dan kehadiran fasa pengotor hematit (α-Fe 2 O 3 ) mempengaruhi sifat kemagnetan nanopartikel MnFe 2 O 4 . Abstract -Magnetite nanoparticles have been synthesized by a variety of different grain sizes derived from FeCl 3 .6H 2 and MnSO 4. H 2 O materials by co-precipitation method with various synthesis temperature and concentration of NaOH. The structural characteristics and particle size of MnFe 2 O 4 were determined by X-ray diffraction (XRD) and TransmissionElectron Microscopy (TEM), its showed that nanoparticles well crystallized with various grain size which depend on synthesis parameters. The grain sizes estimated using the Scherrer formula were found that the grain size increased with increasing temperature synthesis and decreasing concentration of NaOH. Magnetic characterization of MnFe 2 O 4 nanoparticles was investigated by using a Vibrating Sample Magnetometer (VSM). Sample with various concentration of NaOH showed that coercivity was decrease with the decrease of particle size. In other hand, samples with various synthesis temperature found that sample with smallest grain size have high coersivity. The saturation magnetization increase when crystallinity increase. Based on the results, it can be concluded that magnetic characterization of MnFe 2 O 4 was influenced by grain size and presence of an impurity phase hematite (α-Fe 2 O 3 )

Synthesis and Characterization of Manganese Ferrite (MnFe2O4) Nanoparticles by Coprecipitation Method at Low Temperatures

“…After washing, the precipitate will be put in a furnace for 4 hours at 90 °C, 120 °C, and 150 °C. The following is the equation for nanoparticle reaction [6]: B. X-Ray Diffraction XRD (X-Ray Diffraction) microstructure characterization of MnFe2O4 nanoparticles, including crystal structure, lattice parameters, and grain size [8]. The Scherer equation can be used to determine the grain size of nanoparticles [9].…”

“…Manganese ferrite nanoparticles (MnFe2O4) are soft ferrites with higher magnetic permeability and lower resistivity than CoFe2O4 and NiFe2O4. The synthesis of MnFe2O4 by coprecipitation method and magnetism characterization at low temperature ( < 300 °C) and room temperature (25 °C) have been successfully carried out to obtain the smallest grain size at room temperature, but a hematite impurity phase (Fe2O3) still exists [6]. Moment of magnetic attraction with a magnetic spin of 5 µB.…”

“…The results of research on manganese ferrite using different methods revealed a difference in grain size ranging from the smallest (4 nm) at 320 °C to the largest (154,1 nm) at 420 °C [6]. However, from all research studies on MnFe2O4 carried out at high temperature and room temperature, in this study the characterization of nanoparticles using low temperature was to determine the effect of low temperature variations on the microstructure produced in the synthesis process carried out by the coprecipitation method.…”

Kajian Integrasi Islam dan Sains pada Pendayagunaan Besi Oksida dalam Bidang Medis

“…Terdapat beberapa metode untuk sintesis besi oksida dari pasir besi, akan tetapi terdapat metode yang paling sederhana yaitu kopresipitasi (Arun, 2016). Metode kopresipitasi merupakan metode sederhana antara kation logam yang memiliki kelarutan tinggi terhadap garam tertentu sehingga akan membentuk endapan dalam bentuk hidroksida, karbonat, oksalat dan sitrat (Tawainella et al, 2014).…”

Kajian Mikrostruktur dan Dielektrik Nanopartikel MnFe2O4 Yang Disintesis Dengan Metode Kopresipitasi

“…Nanopartikel manganese ferrite (MnFe2O4) merupakan ferrit lunak yang memiliki permeabilitas kemagnetan yang tinggi, momen magnetik lebih tinggi dan resistivitasnya jauh lebih rendah dari CoFe2O4 dan NiFe2O4. Sintesis MnFe2O4 dengan metode kopresipitasi dan karakterisasi kemagnetan pada suhu rendah dan suhu ruang diperoleh ukuran butir terendah pada suhu ruang (Tawainella et al, 2014). Beberapa penelitian sebelumnya mensintesis nanopartikel magnetik Fe3O4 dengan metode kopresipitasi pada suhu ruang 25 o C dan karakterisasi Fe3O4 menggunakan TEM memperoleh ukuran butir rata-rata 9,69 ± 1,06 nm (B.…”