FABRIKASI NANOPARTIKEL MAGNESIUM FERRITE (MgFe2O4) DENGAN METODE KOPRESIPITASI DAN KARAKTERISASI STRUKTUR KRISTAL DAN SIFAT KEMAGNETANNYA; FABRICATION OF MAGNESIUM FERRITE (MgFe2O4) NANOPARTICLES USING COPRECIPITATION METHOD AND CHARACTERIZATION OF THEIR CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES
Hermawan, Agung, Edi Suharyadi
2015 | Disertasi | FMIPAMagnesium ferrite (MgFe2O4) magnetic nanoparticles has great potential to be applied as adsorption, sensors, drug delivery, semiconductor materials and other magnetic technology. MgFe2O4 has been synthesized by coprecipitation method. Precursor used are MgCl2.6H2O (magnesium chloride hexa-hydrate, Mr = 203.205 g/mol) and FeCl3. 6H2O (ferric chloride hexa-hydrate, Mr = 270.19 g/mol) and NaOH (sodium hydroxide, Mr = 39.99 g / mol) as coprecipitant. This synthesis process was done by varying the NaOH concentration, the synthesis temperature and the stirring duration. XRD analysis results showed that the grain size increases with synthesis temperature and decreases with the increase in the concentration of NaOH and the duration of stirring. The smallest grain size is sample D 2.12 ± 0.13 nm. Analysis of magnetic properties MgFe2O4 by Vibrating Sample Magnetometer (VSM) showed that nanoparticles MgFe2O4 can be assumed in the region multidomain, with relationships H t c ?1 . Sample D with the smallest particle size 2,1 nm, has highest Hc value 133.99 Oe. The maximum magnetization at H = 15 kOe and remanent magnetization (Mr) increase with the degree of crystallinity of the sample. Although there is also the effect of the presence of hematite phase (?-Fe2O4) and the grain size. Sample G has maximum value of magnetization 6.15 emu/g and highest remanent magnetization 0.094 emu/g. Based on the results of FTIR analysis samples contained MgFe2O4 nanoparticle has uptake group numbers 578.64 cm-1 which is a stretching vibration between metal ions (Mg) and oxygen (O) in tetrahedral positions and has wave number 362.62 cm-1 which is the group uptake of metal ions (Fe) and oxygen (O) in the octahedral position.
Kata Kunci : nanoparticles; magnesium ferrite (MgFe2O4); copresipitation and magnetic properties
