Structural properties and magnetic interactions in Al3+ and Cr3+ co-substituted CoFe2O4 ferrite

More, S.S.; Kadam, R H; Kadam, A. B.; Mane, D.R.; Bichile, G. K.

doi:10.2478/s11532-009-0145-5

Cited by 22 publications

(6 citation statements)

References 23 publications

(23 reference statements)

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“…The values of crystalline sizes appear constant after x = 0.40; this is also effected by ionic radius and attractive forces between Zr 4+ and Fe 3+ . These observations are in good agreement with several other studies where large metallic ions are incorporated between relatively small metallic ions [2,21,22]. Variation in X-ray density and measured density with respect to concentration of dopant are shown in Fig.…”

Section: Structural Studiessupporting

confidence: 91%

Effect of Concentration of Zr4+ and Ni2+ Dopants on Electrical, Magnetic and Y–K Angle of Mg–Cu Complex Spinel Nanoferrites

Faraz

2011

J Supercond Nov Magn

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The complex Mg-Cu nanoferrites with composition Mg 0.5 Cu 0.5 Fe 2−2x Ni x Zr x O 4 (0.00 ≤ x ≤ 0.80) were synthesized by incorporating dopants Zr 4+ and Ni 2+ with the help of chemical co-precipitation method. The synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), dc electrical and magnetic properties through laboratory-made two-probe resistivity apparatus and vibrating sample magnetometer (VSM). XRD confirmed the formation of single phase spinel nanoferrites having crystalline size in range 16-29 nm. The particle size (t) and lattice parameter (a) increase with the increase in concentration of dopants. The XRD results are in good agreement with SEM results. FTIR give valuable information about the presence of tetrahedral (A) and octahedral (B) sites by considering higher and lower frequency bands, respectively. The electrical properties, e.g. dc electrical resistivity (ρ d ), drift mobility (μ d ) and activation energy (E), were calculated. Resistivity data confirm semiconducting behavior of material. And it is observed that an abrupt increase in resistivity occurs up to x = 0.40. While further increase in dopants concentration leads to decrease in resistivity. Magnetic hysteresis loops confirmed soft nature of synthesized material. Interesting magnetic behavior is observed that up to x = 0.40 the value of saturation magnetization (M s ), remanence (M r ) and Bohr magneton (n B ) increase and after that decrease in trend occurs. For x = 0.40, minimum coercive force (H c ) is observed. Y-K angle increases with increase in dopant concentration. So it is confirmed that A. Faraz ( ) Thermal Transport Laboratory (TTL), School of chemical and materials Engineering (the incorporation of dopant in small amount (x ≤ 0.40) enhances magnetic properties and further increase of Zr 4+ can weaken magnetic properties.

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Section: Structural Studiessupporting

confidence: 91%

Effect of Concentration of Zr4+ and Ni2+ Dopants on Electrical, Magnetic and Y–K Angle of Mg–Cu Complex Spinel Nanoferrites

Faraz

2011

J Supercond Nov Magn

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“…is is related to the substitution of metal ions (Al) for Si in the SBA-15 framework. Because the ionic radius of Al 3+ (0.51Å) is greater than Si 4+ (0.41Å), the Al-O bond lengths are longer than Si-O bond, leading to increase in d 100 and a 0 parameters [7,17,21]. is result strongly confirms that Al incorporation into SBA-15 framework.…”

Section: X-ray Diffraction Spectroscopy (Xrd)supporting

confidence: 58%

Cellulose Conversion to 5 Hydroxymethyl Furfural (5-HMF) Using Al-Incorporated SBA-15 as Highly Efficient Catalyst

Phạm

Nguyen

et al. 2019

Journal of Chemistry

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Al-incorporated SBA-15 samples (xAl/SBA-15) were successfully prepared by "atomic implantation" method. e samples were characterized by X-ray diffraction spectroscopy (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), N 2 adsorption-desorption isotherms (BET), and temperature-programmed desorption (NH 3 -TPD). In this catalyst, metal oxide species were highly dispersed on the SBA-15 surface and existed as isolated atoms. It was shown that the Al incorporation lead to the formation of medium and strong acid sites. e catalytic activity and selectivity were tested in a mild hydrothermal process for degradation of cotton cellulose to 5-hydroxymethyl furfural (5-HMF). A cellulose conversion of 68.5% and 5-HMF selectivity of 62.1% after 2 h of reaction at 170°C were achieved. e very high 5-HMF yield (42.57%) obtained in this paper is much higher than that was reported in the literature.

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“…Force constants for A- and B-sites represented as K T and K O , respectively, were obtained using the relations discussed elsewhere [ 46 ].…”

Section: Resultsmentioning

confidence: 99%

A thorough Investigation of Rare-Earth Dy3+ Substituted Cobalt-Chromium Ferrite and Its Magnetoelectric Nanocomposite

Kadam¹,

Shitole²,

Kadam

et al. 2023

Nanomaterials

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The stoichiometric compositions of a ferrite system with a chemical formula CoCr0.5DyxFe1.5−xO4 where x = 0.0, 0.025, 0.05, 0.075 and 0.1 were prepared by the sol-gel auto-combustion method. The structural, morphological and magnetic properties were studied by the X-ray diffraction (XRD), infra-red spectroscopy (IR), scanning electron microscopy, transmission electron microscopy and vibrating sample magnetometer. XRD analysis confirmed the cubic spinel structure of the prepared samples without the presence of any impurity and secondary phases. Selected area electron diffraction and IR measurements gives further confirmation to the XRD observations. Considering that strain mechanism, elastic properties and cation distribution play a major role for controlling the magnetic properties and therefore these properties were precisely evaluated through reliable methodologies such as XRD and IR data. The cation distribution was determined by the X-ray diffraction data which are further supported by the magnetization studies. Magnetoelectric properties of CoCr0.5DyxFe1.5−xO4 + BaTiO3 have also been investigated. The mechanisms involved are discussed in the manuscript.

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Structural properties and magnetic interactions in Al3+ and Cr3+ co-substituted CoFe2O4 ferrite

Cited by 22 publications

References 23 publications

Effect of Concentration of Zr4+ and Ni2+ Dopants on Electrical, Magnetic and Y–K Angle of Mg–Cu Complex Spinel Nanoferrites

Effect of Concentration of Zr4+ and Ni2+ Dopants on Electrical, Magnetic and Y–K Angle of Mg–Cu Complex Spinel Nanoferrites

Cellulose Conversion to 5 Hydroxymethyl Furfural (5-HMF) Using Al-Incorporated SBA-15 as Highly Efficient Catalyst

A thorough Investigation of Rare-Earth Dy3+ Substituted Cobalt-Chromium Ferrite and Its Magnetoelectric Nanocomposite

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