Comparison of the Crystalline Structure and Magnetic Properties in Coprecipitated CoFe₂O₄ and CoLa_0.1Fe_1.9O₄

Abstract:

Comparison of the crystalline structure and magnetic properties in CoFe₂O₄ and CoLa_0.1Fe_1.9O₄ nanoparticles have been studied. The obtained samples are characterized by using X-Ray Diffractometer (XRD), Fourier Transform InfraRed (FTIR) and Vibrating Sample Magnetometer (VSM). The XRD results show that the crystallite size of the samples are 24.539 nm and 28.772 nm for the CoFe₂O₄ and CoLa_0.1Fe_1.9O₄ nano particles, respectively. Furthermore, the crystalline strain is 0.00460 and lightly decreases to 0.00392 with the presence of lanthanum. The different of the atomic radius for both Fe³⁺ (1.26 Å) and La³⁺ (1.87 Å) should attribute to the change of the crystalline strain. FTIR results show that the absorption peak of the CoFe₂O₄ occur at k = 591.21/cm and the CoLa_0.1Fe_1.9O₄ is 594.10/cm. This indicate that the lanthanum cation successfully substitutes to the original bonding-structure of the CoFe₂O₄. VSM results show that the H_C are 1.02 kOe and 0.705 kOe for the samples without and with La³⁺ cations. Moreover, the M_S is equal 69.625 emu/g and decrease of 55.70 emu/g with the present of the La³⁺ cations. Finally, the strains-induce-magnetism should contribute to the changes of the M_S that associated with changes in crystalline strains at the previous discussion.

• Periodical: Key Engineering Materials (Volume 855)
• Pages: 16-21
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.855.16
• Online since: July 2020
• Authors: Riyana Indah Setiyani*, Utari Utari, Yofentina Iriani, Budi Purnama
• Keywords: Annealing, Cobalt Ferrite, Co-Precipitation, Lanthanum, Nanoparticles

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