The Properties of Mn,  Ni,  and Al Doped Cobalt Ferrites Grown by Sol-Gel Method

Seung Han Choi

doi:10.3740/MRSK.2018.28.7.371

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The Properties of Mn, Ni, and Al Doped Cobalt Ferrites Grown by Sol-Gel Method

July 2018. pp. 371-375

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Abstract

The manganese-, nickel-, and aluminum-doped cobalt ferrite powders, Mn0.2Co0.8Fe2O4, Ni0.2Co0.8Fe2O4, and Al_0.2CoFe_1.8O₄, are fabricated by the sol-gel method, and the crystallographic and magnetic properties of the powders are studied in comparison with those of CoFe₂O₄. All the ferrite powders are nano-sized and have a single spinel structure with the lattice constant increasing in Mn0.2Co0.8Fe2O4 but decreasing in Ni0.2Co0.8Fe2O4 and Al_0.2CoFe_1.8O₄. All the Mössbauer spectra are fitted as a superposition of two Zeeman sextets due to the tetrahedral and octahedral sites of the Fe³⁺ ions. The values of the magnetic hyperfine fields of Ni0.2Co0.8Fe2O4 are somewhat increased in the A and B sites, while those of Mn0.2Co0.8Fe2O4 and Al_0.2CoFe_1.8O₄ are decreased. The variation of Mössbauer parameters is explained using the cation distribution equation, superexchange interaction and particle size. The hysteresis curves of the ferrite powders reveal a typical soft ferrite pattern. The variation in the values of saturation magnetization and coercivity are explained in terms of the site distributions, particle sizes and the spin magnetic moments of the doped ions.

Keywords

cobalt ferrite

sol-gel method

Mössbauer spectroscopy

coercivity

saturation magnetization

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 28
No :7
Pages :371-375
Received Date : 2018-05-15
Revised Date : 2018-06-26
Accepted Date : 2018-06-26
DOI :https://doi.org/10.3740/MRSK.2018.28.7.371

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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