Author/Authors :
rahmawati, r. institut teknologi bandung - faculty of industrial technology - engineering physics department, Bandung, Indonesia , rahmawati, r. state islamic university(uin) sunan kalijaga - faculty of sains and technology - department of physics, Yogyakarta, Indonesia , taufiq, a. universitas negeri malang (state university of malang) - faculty of mathematics and natural sciences - department of physics, Malang, Indonesia , sunaryono, s. universitas negeri malang (state university of malang) - faculty of mathematics and natural sciences - department of physics, Malang, Indonesia , fuad, a. universitas negeri malang (state university of malang) - faculty of mathematics and natural sciences - department of physics, Malang, Indonesia , yuliarto, b. institut teknologi bandung - faculty of industrial technology, research center of nanosciences and nanotechnology - engineering physics department, Bandung, Indonesia , suyatman, s. institut teknologi bandung - faculty of industrial technology - engineering physics department, Bandung, Indonesia , kurniadi, d. institut teknologi bandung - faculty of industrial technology - engineering physics department, Bandung, Indonesia
Abstract :
Magnetite (Fe_3O_4) nanoparticles have been synthesized from iron sands with both coprecipitation and co-precipitation—ultrasonic irradiation methods. X-ray diffraction (XRD) patterns showed that Fe_3O_4 samples generated by these two synthesis methods are in a single phase with a cubic spinel structure. This research investigates the influence of ultrasonic irradiation in the synthesis process including size, morphology, composition and magnetic properties. The morphology of Fe_3O_4 was characterized by a transmission electron microscopy (TEM) instrument. The TEM image of Fe_3O_4 synthesized using the ultrasonic irradiation method showed a reduction of the agglomeration of the Fe_3O_4 particles. Moreover, the TEM images also showed that the primary particles of Fe_3O_4 prepared by the co-precipitation method tend to agglomerate as the particles cluster, with the particle size ranging from 9 to 33 nm. Meanwhile, Fe_3O_4 synthesized using the ultrasonic irradiation method tends to construct a primary particle sized about 25 to 37 nm. The magnetic properties that were characterized by vibrating sample magnetometer (VSM) measurement showed that Fe_3O_4 exhibited superparamagnetic behavior at room temperature.
Keywords :
Co , precipitation , Iron sands , Magnetite , Superparamagnetic , behavior , Ultrasonic , irradiation
