Effect of aluminum substitution on the structural and magnetic properties of cobalt ferrite synthesized by sol–gel auto combustion process

In this work, we studied the structural and magnetic properties of multiferroic La1-xYxFeO3 perovskites, (x= 0.0, 0.05, 0.1, 0.15, 0.25 and 0.3) which synthesized through Sol-gel auto-combustion technique using a citric acid as a fuel. The room temperature synchrotron X-ray diffraction (XRD) analysis revealed that the all the synthesized samples consisted of the polycrystalline orthorhombic structure perovskites(space group pnma), and tolerance factor confirmed the phase stability of the prepared perovskite system.The Williamson-Hall plot based on synchrotron XRD data were employed to estimate the average particle diameter and varies from 18 nmto 27.8 nm.For a deeper insight of the crystal structure, high resolution transmission microscopy imaging (HRTEM) was performed. The estimated values of crystallite size from HRTEM and synchrotron XRD data were coincident. Many of crystallographic parameters and electron density measurements were calculated by Rietveld refinement of synchrotron XRD data. La1-xYxFeO3 perovskite crystalsarecanted antiferromagnets with a weak ferromagnetism in room temperature.The magnetic properties were gotten through analyzing the magnetization versus temperature M(T) and M(H) hysteresis loop which characterized by a vibrating sample magnetometer (VSM). The molecular structure showed the decrease of the tilting of the octahedra <FeO6> with increasing Y content trying to strengthen the ferromagnetic character. Selected Area Electron Diffraction (SAED) patterns of the investigated samples exhibited spotty ring patterns,confirming the polycrystalline character.The orthoferrite La1-xYxFeO3 crystalsare a promising candidate for optical device applications in broad temperature range and high power system.

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The structural and magnetic properties of the nano-CoFe2O4 ferrite prepared by sol-gel auto-combustion technique

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2019.152786 ◽

2020 ◽

Vol 817 ◽

pp. 152786 ◽

Cited By ~ 8

Author(s):

Mohammed S. Al Maashani ◽

Kadhim A. Khalaf ◽

Abbasher M. Gismelseed ◽

Imaddin A. Al-Omari

Keyword(s):

Magnetic Properties ◽

Sol Gel ◽

Auto Combustion ◽

Structural And Magnetic Properties ◽

Combustion Technique

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Structural and magnetic properties of Gd–Zn substituted M-type Ba–Sr hexaferrites by sol-gel auto-combustion method

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2019.06.348 ◽

2019 ◽

Vol 803 ◽

pp. 971-980 ◽

Cited By ~ 9

Author(s):

Kai Huang ◽

Jiangying Yu ◽

Li Zhang ◽

Jinrong Xu ◽

Zhiyun Yang ◽

...

Keyword(s):

Magnetic Properties ◽

Sol Gel ◽

Combustion Method ◽

Auto Combustion ◽

Structural And Magnetic Properties

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Structural, morphological and magnetic properties of Mn2+ ions substituted nanosized nickel–copper–cobalt ferrites through sol–gel auto-combustion method

Modern Physics Letters B ◽

10.1142/s0217984920500025 ◽

2019 ◽

Vol 34 (01) ◽

pp. 2050002

Author(s):

Wei Zhang ◽

Aimin Sun ◽

Xiqian Zhao ◽

Xiaoguang Pan ◽

Yingqiang Han

Keyword(s):

Magnetic Properties ◽

Saturation Magnetization ◽

Spinel Structure ◽

Remanent Magnetization ◽

Cobalt Ferrite ◽

Sol Gel ◽

Combustion Method ◽

Magnetic Data ◽

Nickel Copper ◽

Auto Combustion

Manganese substituted nickel–copper–cobalt ferrite nanoparticles having the basic composition [Formula: see text] (x = 0.0, 0.1, 0.2, 0.3 and 0.4) were synthesized by sol–gel auto-combustion method. X-ray diffraction (XRD) was used to estimate phase purity and lattice symmetry. All the prepared samples show the single-phase cubic spinel structure. Fourier transform infrared (FTIR) measurements also confirm the cubic spinel structure of the ferrite that is formed. The preparation of samples show these nearly spherical particles by Transmission electron microscopy (TEM). The magnetic properties of Mn[Formula: see text] ion substituted in nickel–copper–cobalt ferrite were studied by Vibrating sample magnetometer (VSM). The saturation magnetization ([Formula: see text]), remanent magnetization [Formula: see text], coercivity [Formula: see text], magnetic moment [Formula: see text] and anisotropy constant [Formula: see text] first increase and then decrease with the increase of [Formula: see text] ions content. They had better magnetism than pure sample and other substituted samples when the substitution amount of [Formula: see text] ions was [Formula: see text]. At [Formula: see text], the maximum values of remanent magnetization [Formula: see text], saturation magnetization [Formula: see text] and coercivity [Formula: see text] are 25.58 emu/g, 61.95 emu/g and 689.76 Oe, respectively. This indicates that the magnetism of ferrite can improve by substituting with the appropriate amount of manganese. However, due to the excess [Formula: see text] ions instead, ferrite magnetism is weakened. This means that these materials can be used in magnetic data storage and recording media.

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