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Crystal Structures and Magnetic Properties of Silica-Encapsulated CoZnFe₂O₄ Magnetic Nanoparticles
La Ode Rusman,Amjad Tri Puspitasari,Edi Suharyadi,Takeshi Kato,Satoshi Iwata 한국자기학회 2019 Journal of Magnetics Vol.24 No.1
Zinc-doped cobalt ferrite magnetic nanoparticles (CoZnFe₂O₄) with silica encapsulation have been successfully synthesized by using coprecipitation method. The concentration of silica was varied by 0 %, 5 %, 10 %, 15 %, 20 %, 30 % and 50 % of weight. The XRD spectra show that all samples have the character of the main spinel diffraction peaks (2θ) attributed to the (220), (311), (400), (422), and (511) planes. The FTIR analysis shows that the intrinsic stretching vibrations of metal-oxygen at the frequency range of 393 ㎝<SUP>−1</SUP> - 401 ㎝<SUP>−1</SUP> and 470 ㎝<SUP>−1</SUP> - 563 ㎝<SUP>−1</SUP> were found at octahedral and tetrahedral sublattices, respectively. The unencapsulated CoZnFe₂O₄ nanoparticle has coercivity (Hc) and maximum magnetization (M) of 251 Oe and 29.0 emu/gram, respectively. The coercivity value of the encapsulated nanoparticles increases up to 853 Oe with the increase of silica concentration, while the maximum magnetization decreases to 24.2 emu/gram.