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- W2772630996 abstract "Co-precipitation method was utilized for multiferroic BiFeO3(BFO) nanoparticles synthesis. The influence of different pH values on BFO powders properties was investigated. Thermogravimetric-differential thermal analysis (TG-DTA) technique indicated that optimal calcination and Curie temperatures are 550 °C and 818.7 °C. The precursor samples atomic absorption spectroscopy (AAS) results illustrate Bi and Fe atoms non-homogeneous distribution in normal co-precipitated samples. The phase formation and existence of transient phases like Bi25FeO39 and Bi2Fe4O9 were studied by X-ray diffractometry (XRD). Nanopowders morphological features were characterized using field emission scanning electron microscopy (FESEM). Presence of absorption bands at 400–3600 cm−1 was investigated by Fourier transformed infrared (FTIR) spectroscopy; and magnetic properties of synthesized powders were measured using vibration sample magnetometery (VSM). Results revealed that BFO powders have an R3c crystal structure. FESEM micrographs showed powders with pseudo-cubic shape and average particles size of 41.3 nm and 70.4 nm for normally and reversely synthesized powders. Magnetic hysteresis loops demonstrated a weak ferromagnetic behavior of the samples at room temperature. Due to the fact that the as-prepared powders particles size was lower than that of the spiral spin cycloid (62 nm) and that the nanoparticles surface-to-volume ratio was high and, in turn, led to more uncompensated spins, the weak ferromagnetic behavior was observed. Besides, the pH value decrement improved magnetization from 0.11 emu/g for pH = 10.5–0.2 emu/g for pH = 8.5." @default.
- W2772630996 created "2017-12-22" @default.
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- W2772630996 date "2018-04-01" @default.
- W2772630996 modified "2023-10-09" @default.
- W2772630996 title "Monitoring the Bi/Fe ratio at different pH values in BiFeO3 nanoparticles derived by normal and reverse chemical co-precipitation: A comparative study on the purity, microstructure and magnetic properties" @default.
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- W2772630996 doi "https://doi.org/10.1016/j.ceramint.2017.12.111" @default.
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