A Facile Synthesis and Characterization of Highly Crystalline Submicro-Sized BiFeO3

Abstract

<jats:p>In this study, a highly crystalline bismuth ferrite (BFO) powder was synthesized using a novel, very simple, and cost-effective synthetic approach. It was demonstrated that the optimal annealing temperature for the preparation of highly-pure BFO is 650 °C. At lower or higher temperatures, the formation of neighboring crystal phases was observed. The thermal behavior of BFO precursor gel was investigated by thermogravimetric and differential scanning calorimetry (TG-DSC) measurements. X-ray diffraction (XRD) analysis and Mössbauer spectroscopy were employed for the investigation of structural properties. Scanning electron microscopy (SEM) was used to evaluate morphological features of the synthesized materials. The obtained powders were also characterized by magnetization measurements, which showed antiferromagnetic behavior of BFO powders.</jats:p>

Lanthanum and Manganese Co-Doping Effects on Structural, Morphological, and Magnetic Properties of Sol-Gel Derived BiFeO3

“…However, for BiFe1-xMnxO3 solutions, Mn influences magnetic order, which can cause the formation of additional paramagnetic compounds [22], which cause a decrease in uncompensated magnetisation. The linear dependence of magnetisation (Figure 6) is generally consistent with the antiferromagnetic order of spins in samples, but at least for BiFe 0.85 Mn 0.15 O 3 , the observed magnetisation is larger than that of bulk BiFeO 3 [47,48]. It is noteworthy that in the case of nanocrystalline BiFeO 3 and LaFeO 3 (Table 1), weak ferromagnetism due to uncompensated magnetic moments on the surface of grains can cause an increase in magnetisation [49][50][51].…”

“…At low temperature (Figure 7b), however, the spectra could be fitted to two sextets. The line broadening caused the average hyperfine field <B> (Figure 7c) to be lower than the hyperfine field characteristic of BiFeO 3 (49-50 T [48]) and LaFeO 3 (51.3 T [51]). The parameters of Mössbauer spectra (Figure 7c) slightly depend on the composition of samples.…”

Photocatalytic Degradation of Cefixime Trihydrate by Bismuth Ferrite Nanoparticles

“…The figure illustrates the calculation of the bandgap energy (E g ) using the Tauc equation, (αh ν) n = C(h ν −E g ), where α is the absorption coefficient, h is Planck’s constant, ν is the light frequency, E g is the bandgap energy, and C is a constant. The value of n was chosen as 2, which corresponded to a direct bandgap [ 51 ], while the value of α was calculated as follows. α = 2.303 × 10 3 ρ A / lcM , where ρ is the theoretical density of BiFeO 3 (8.22 g cm −3 ), A is the absorbance of the BiFeO 3 nanocatalyst solution, l is the optical path length of the quartz cell (1 cm), c is the molar concentration of the suspension solution, and M is the molecular weight of the BiFeO 3 nanocatalyst [ 52 ].…”

Synthesis and Investigation of Structural and Magnetic Properties of Nickel Doped BiFeO3

“…However, Ni based impurity was not detected in any of the samples. While annealing temperature increases from 500 ºC to 600 ºC, the intensity of the peaks increases due to the increasing crystallinity (Karoblis et al 2020). In terms of the solvents, the sharper peaks were obtained for the acetic acid solvents.…”