Role of Bismuth in Cobalt Spinel Ferrite

Anjum, Safia; Sehar, Fatima; Bashir, Furrukh; Awan, M. S.; Mustafa, Zeeshan

doi:10.1016/j.matpr.2015.11.018

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…The changes in the M S magnitude was consistent by the decrease in the n B of the CoFe 2 O 4 nanoparticles after doping with Bi 3+ , La 3+ , and Al 3+ i.e., 2.90, 1.33, 0.40, 2.69, respectively. The decrease in the M S magnitude after doping with trivalent ions (Bi 3+ , La 3+ , and Al 3+ ) was similar to that reported by Anjum et al [83] for bismuth-doped cobalt ferrite, Kumar & Kar [56] for lanthanum-doped cobalt ferrite, and Rather et al [65] for aluminum-doped cobalt ferrite. The reduction in the M S in the doped samples is related to the redistribution of cations at the tetrahedral and octahedral sites.…”

Section: ¯( )supporting

confidence: 86%

“…The metal trivalent ions should partially substitute Fe 3+ in the octahedral site as consequent as Jahn-Teller effect. With the results decrease in the M S magnitude (also the M S (LoA) ) [40,45,65,83]. The calculation results of d e and d JT of CoFe 2 O 4 , CoBi 0.1 Fe 1.9 O 4 , CoLa 0.1 Fe 1.9 O 4 , and CoAl 0.1 Fe 1.9 O 4 nanoparticles are shown in table 6.…”

Section: ¯( )mentioning

confidence: 87%

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Cation trivalent tune of crystalline structure and magnetic properties in coprecipitated cobalt ferrite nanoparticles

Prasetya

Setiyani²,

Utari³

et al. 2023

Mater. Res. Express

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CoFe2O4, CoBi0.1Fe1.9O4, CoLa0.1Fe1.9O4, and CoAl0.1Fe1.9O4 nanoparticles were successfully synthesized by the coprecipitation method. After annealing at 700C for 5 h, the X-Ray Diffractometer results confirm that a single phase of cobalt ferrite-based nanoparticles is obtained, which is suitable for ICDD 22-1086. The addition of Bi3+, La3+ and Al3+ ions to the cobalt ferrite nanoparticles modified the crystallite size and lattice constant. Trivalent metal cation substitution tunes the crystallite size which has also been confirmed by measuring the grains with Scanning Electron Microscope images. In the Far Transform Infra-Red curve, the addition of metal ions (Bi3+, La3+, and Al3+) to cobalt ferrite nanoparticles resulted in absorption peaks at the tetrahedral and octahedral sites without any additional absorption peaks. The VSM results showed that saturation magnetization decreased drastically in the presence of trivalent non-magnetic cations, which confirms the replacement of Fe3+ by trivalent non-magnetic cations. The kOe order of the coercive field was obtained in this experiment. The largest coercive field of the cobalt ferrite nanoparticles was obtained with the addition of La3+ ions, i.e., 3.67 kOe suggest supporting both Jahn-Teller effect and strain-induced magnetism.

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Section: ¯( )supporting

confidence: 86%

Section: ¯( )mentioning

confidence: 87%

Cation trivalent tune of crystalline structure and magnetic properties in coprecipitated cobalt ferrite nanoparticles

Prasetya

Setiyani²,

Utari³

et al. 2023

Mater. Res. Express

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“…This is due to the replacement of large radius of Fe 3+ ion (0.76 Å) by smaller radius of Bi 3+ ion (0.74 Å) at the octahedral site. [34][35][36] Lattice constant first decreases rapidly with the substitution and then increases, in the end it again decreases, which s may be due to the segregation of Bi 3+ ions on grain boundaries. [1] The x-ray density of synthesized ferrite is found from the following formula:…”

Section: Xrd Analysismentioning

confidence: 95%

Effects of bismuth on structural and dielectric properties of cobalt-cadmium spinel ferrites fabricated via micro-emulsion route

Sheikh¹,

Khalid²,

Shifa³

et al. 2019

Chinese Phys. B

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Spinel ferrites have a significant role in high-tech applications. In the present work nano-crystalline ferrites having general formula Co0.5Cd0.5Bi x Fe2−x O4 with (x = 0.0, 0.05, 0.1, 0.15, 0.2, and 0.25) are synthesized via micro-emulsion route. Powder x-ray diffraction (XRD) studies discover the FCC spinel structure. Crystalline size is calculated in a range of 11 nm–15 nm. Lattice parameter calculations are reduced due to its substitution which leads to the exchange of large ionic radius of Fe3+ for small ionic radius of Bi3+. The x-ray density is analyzed to increase with doping. Fourier transform infrared spectroscopy (FTIR) is performed to analyze absorption band spectra. The two absorption bands are observed in a range of 400 cm−1–600 cm−1, and they are the characteristic feature of spinel structure. Thermo-gravimetric analysis (TGA) reveals the total weight loss of nearly 1.98%. Dielectric analysis is carried out by impedance analyzer in a frequency span from 1 MHz to 3 GHz by using the Maxwell Wagner model. Dielectric studies reveal the decrease of dielectric parameters. The alternating current (AC) conductivity exhibits a plane behavior in a low frequency range and it increases with the applied frequency increasing. This is attributed to the grain effects in a high frequency range or may be due to the reduction of porosity. Real and imaginary part of impedance show the decreasing trend which corresponds to the grain boundary action. The imaginary modulus shows the occurrence of peak that helps to understand the interfacial polarization. Cole-Cole graph shows a single semicircle which confirms that the conduction mechanism is due to the grain boundaries at low frequency. Dielectric studies reveal the applicability of these ferrites in high frequency equipment, microwave applications, high storage media, and semiconductor devices.

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Evidence of enhanced ferromagnetic nature and hyperfine interaction studies of Ce-Sm doped Co-Ni ferrite nanoparticles for microphone applications

Srinivasamurthy

Angadi

Кубрин

et al. 2018

Ceramics International

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Role of Bismuth in Cobalt Spinel Ferrite

Cited by 7 publications

References 11 publications

Cation trivalent tune of crystalline structure and magnetic properties in coprecipitated cobalt ferrite nanoparticles

Cation trivalent tune of crystalline structure and magnetic properties in coprecipitated cobalt ferrite nanoparticles

Effects of bismuth on structural and dielectric properties of cobalt-cadmium spinel ferrites fabricated via micro-emulsion route

Evidence of enhanced ferromagnetic nature and hyperfine interaction studies of Ce-Sm doped Co-Ni ferrite nanoparticles for microphone applications

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