Comprehensive characterization of BiFeO3 powder synthesized by the hydrothermal procedure

Abstract

In this paper, bismuth ferrite (BFO) particles synthesized by controlled hydrothermal process, where the particles of small sizes and with high purity were obtained. Structural analysis showed that non-annealed powder can be perfectly fitted to rhombohedral space group R3c and contains a very small amount of secondary phase, whereas the final product (annealed at 800?C) represents single-phase perovskite powder with high crystallinity. HRTEM analysis confirmed existence of twin stacking faults, which are responsible for enhanced magnetic properties. EPR measurements suggested existence of electrons trapped by vacancies or defects. It has been proposed that existence of Fe3+?OV defect complex could be generated at elevated temperatures followed by formation of trivalent Fe ions, which intensely provide local 3d moments. [Projekat Ministarstva nauke Republike Srbije, br. 172015, br. 172018 and i br. III 45012]

Magnesium Bismuth Ferrite Nitrogen-Doped Carbon Nanomagnetic Perovskite: Synthesis and Characterization as a High-Performance Electrode in a Supercapacitor for Energy Storage

“…The peak at 555 °C represents the disintegration of the gel phase and the loss of organic mass. At 1047 and 1105 °C, the antiferromagnetic material turns paramagnetic, exceeding the Neel temperature of MBFO-NC. , The BET surface area and porosity of the MBFO-NC nanomagnetic composite were determined. Figure b shows that MBFO-NC nanomagnetic composite has a high surface area of around 415 m 2 /g.…”

Potassium Polyacrylate-Based Gel Polymer Electrolyte for Practical Zn–Ni Batteries

“…The band at 2700–3300 cm –1 is associated with the stretching vibrations of the C–H polymer chain . Apart from these, O–H exhibits strong and broad peaks from 3300 to 3700 cm –1 , indicating that the electrolyte contains a high OH – concentration, which is beneficial for ionic conductivity. , The water in the gel electrolyte consists of two forms. One is free water and the other is bound water. , TGA was carried out to determine the content of free water and bound in the gel electrolyte.…”

“…40 Apart from these, O−H exhibits strong and broad peaks from 3300 to 3700 cm −1 , indicating that the electrolyte contains a high OH − concentration, which is beneficial for ionic conductivity. 41,42 The water in the gel electrolyte consists of two forms. One is free water and the other is bound water.…”

Synthesis, Characterization, and Photocatalytic Activity of Ba-Doped BiFeO3 Thin Films

“…Since the measurements start from 600 cm −1 , the FTIR spectra could not confirm exactly the Fe-O stretching or O-Fe-O bending vibration modes corresponding to the 547 cm −1 and 435 cm −1 respectively [35][36][37][38]. Anyway, the absorption band traces that can be seen around 600 cm −1 make us to assign it to the Fe-O stretching vibrations of FeO 6 group in the perovskite compounds [35]. The obvious absorption bands near 756 cm −1 and ~891 cm −1 can be attributed to the Bi-O bending vibration for the pure BFO film [39] and also may be due to the metal-oxygen Ba-O stretching vibration [40] for BBFO films.…”

“…The spectra of the BBFO films (with 0 ≤ x ≤ 0.05) in the IR (infrared) region were collected at room temperature in the range between 600 and 3000 cm −1 and are shown in the Figure 3. Since the measurements start from 600 cm −1 , the FTIR spectra could not confirm exactly the Fe-O stretching or O-Fe-O bending vibration modes corresponding to the 547 cm −1 and 435 cm −1 respectively [35][36][37][38]. Anyway, the absorption band traces that can be seen around 600 cm −1 make us to assign it to the Fe-O stretching vibrations of FeO 6 group in the perovskite compounds [35].…”