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 )
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