Influence of cobalt doping on structural and magnetic properties of BiFeO3 nanoparticles

Khan, Usman; Adeela, N.; Javed, Khalid; Riaz, Saira; Ali, Hafiz T.; Iqbal, Muhammad Aamir; Han, X. F.; Naseem, Shahzad

doi:10.1007/s11051-015-3233-9

Cited by 64 publications

(12 citation statements)

References 34 publications

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“…In M-H loop formation of CS nanostructures (Figure 5b), a small kink shape can be seen, which results due to the presence of two mixed magnetic phases (soft and hard) and their exchange interactions [38]. …”

Section: Resultsmentioning

confidence: 99%

RETRACTED: Structural and Magnetic Response in Bimetallic Core/Shell Magnetic Nanoparticles

et al. 2016

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Bimagnetic monodisperse CoFe2O4/Fe3O4 core/shell nanoparticles have been prepared by solution evaporation route. To demonstrate preferential coating of iron oxide onto the surface of ferrite nanoparticles X-ray diffraction (XRD), High resolution transmission electron microscope (HR-TEM) and Raman spectroscopy have been performed. XRD analysis using Rietveld refinement technique confirms single phase nanoparticles with average seed size of about 18 nm and thickness of shell is 3 nm, which corroborates with transmission electron microscopy (TEM) analysis. Low temperature magnetic hysteresis loops showed interesting behavior. We have observed large coercivity 15.8 kOe at T = 5 K, whereas maximum saturation magnetization (125 emu/g) is attained at T = 100 K for CoFe2O4/Fe3O4 core/shell nanoparticles. Saturation magnetization decreases due to structural distortions at the surface of shell below 100 K. Zero field cooled (ZFC) and Field cooled (FC) plots show that synthesized nanoparticles are ferromagnetic till room temperature and it has been noticed that core/shell sample possess high blocking temperature than Cobalt Ferrite. Results indicate that presence of iron oxide shell significantly increases magnetic parameters as compared to the simple cobalt ferrite.

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Section: Resultsmentioning

confidence: 99%

RETRACTED: Structural and Magnetic Response in Bimetallic Core/Shell Magnetic Nanoparticles

et al. 2016

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“…The results indicated that the Co 3+ ions diffused and substituted to Fe 3+ sites caused shrinkage the lattice parameters because the ionic radius of Co 3+ (0.061 nm) is smaller than ionic radius of Fe 3+ (0.064 nm). The result was consistent with recent observation in lattice distortion in Co doped BiFeO 3 or BKT materials [15,16].…”

Section: Methodssupporting

confidence: 93%

FABRICATION AND PROPERTIES OF Co DOPED Bi0.5K0.5TiO3 – BiFeO3 SOLID SOLUTION

Tuấn¹

2018

JST

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In this study, we present some results on the structure and properties of the solid solution of Bi 0.5 K 0.5 TiO 3 -BiFeCoO 3 (BKT -BFCO) by Sol-gel method. Crystal structures of BKT -BFCO solid solutions were studies by XRD and Raman spectroscopy. The results were in good agreement with the previous reports of Bi 0.5 K 0.5 TiO 3 -BiFeO 3 (BKT -BFO) and Bi 0.5 K 0.5 TiO 3 -BiCoO 3 (BKT -BCO) solid solutions. The magnetic properties were investigated via unsaturated M-H loop, which showed the competition of paramagnetic and antiferromagnetic ordering in BKT -BFCO. However, differing from the BKT -BFO and BKT -BCO solid solutions, the unclear values of saturated magnetism in BKT -BFCO raised the unexplained question, which needed further studies.

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“…As in ferrites, magnetization strongly depends on cationic distribution between tetrahedral (A) and octahedral (B) sites and the spins in these sites are oppositely aligned, leading these materials to act ferromagnetically in nature. Similarly, the effective anisotropy constant ( K ) of the NPs can be calculated at different temperatures using the relation [46]:

H_{c} = \frac{K_{e f f} \times 0.96}{M_{s}}

where H c is the coercivity and M s is the saturation magnetization at a particular temperature. According to the above relation, the anisotropy constant has direct relation with the coercivity of the sample.…”

Section: Resultsmentioning

confidence: 99%

Temperature-Dependent Magnetic Response of Antiferromagnetic Doping in Cobalt Ferrite Nanostructures

Nairan

Khan

et al. 2016

Nanomaterials

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In this work MnxCo1−xFe2O4 nanoparticles (NPs) were synthesized using a chemical co-precipitation method. Phase purity and structural analyses of synthesized NPs were performed by X-ray diffractometer (XRD). Transmission electron microscopy (TEM) reveals the presence of highly crystalline and narrowly-dispersed NPs with average diameter of 14 nm. The Fourier transform infrared (FTIR) spectrum was measured in the range of 400–4000 cm−1 which confirmed the formation of vibrational frequency bands associated with the entire spinel structure. Temperature-dependent magnetic properties in anti-ferromagnet (AFM) and ferromagnet (FM) structure were investigated with the aid of a physical property measurement system (PPMS). It was observed that magnetic interactions between the AFM (Mn) and FM (CoFe2O4) material arise below the Neel temperature of the dopant. Furthermore, hysteresis response was clearly pronounced for the enhancement in magnetic parameters by varying temperature towards absolute zero. It is shown that magnetic properties have been tuned as a function of temperature and an externally-applied field.

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Influence of cobalt doping on structural and magnetic properties of BiFeO3 nanoparticles

Cited by 64 publications

References 34 publications

RETRACTED: Structural and Magnetic Response in Bimetallic Core/Shell Magnetic Nanoparticles

RETRACTED: Structural and Magnetic Response in Bimetallic Core/Shell Magnetic Nanoparticles

FABRICATION AND PROPERTIES OF Co DOPED Bi0.5K0.5TiO3 – BiFeO3 SOLID SOLUTION

Temperature-Dependent Magnetic Response of Antiferromagnetic Doping in Cobalt Ferrite Nanostructures

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