Hydrothermal Synthesis of BiFeO₃ Fine Particles

Abstract

Fine particles of BiFeO 3 were prepared from bismuth nitrate and iron nitrate in KOH solution by hydrothermal reaction. A single phase of BiFeO 3 was prepared under hydrothermal condition of K/Bi ≥ 120 and above 180 ºC. The TG curves of single phase of BiFeO 3 indicated that the products included a small amount of OH group or water in spite of no detection of potassium atom by EDX. The particle size of BiFeO 3 was ~ 10 µm and 10 ~ 20 µm for the products at 180 and 220 ºC, respectively. The particle prepared at 220 ºC was formed by aggregation of ~10 nm size particles with a cubic shape. From the pH dependence of ζ-potential the isoelectric point was about three.

Structural and Optical Properties of BiFeO₃ via Polymer-Assisted Hydrothermal Synthesis under Different Weight of Chitosan

“…Polymer assisted or modification towards BiFeO3 to enhance the properties especially optical properties for photocatalytic applications has been studied and reported where the polymers used during the synthesis were polyvinylpyrrolidone (PVP) [18], polyethylene glycol (PEG 4000) and cetrimonium bromide (CTAB) [15], polyvinyl alcohol (PVA) [12,17,19]. Referring to literature studies [20,21], the sample particles undergo agglomeration that prevents from obtaining nano-sized particles or structures, and thus limits the capability of BiFeO3 for devices applications.…”

Hydrothermal Synthesis and Crystal Structure of a Mixed-Valence Bismuthate, Na3Bi3O8

“…NaBiO 3 · n H 2 O is an attractive starting material for the hydrothermal synthesis of novel compounds − as well as hybrid composites for photocatalytic activities. − Its accurate crystal structure has not been solved. However, the crystal structure of the dehydrated phase, NaBiO 3 , was determined to be an ilmenite phase. , In 1955, Aurivillius expected a hexagonal unit cell for NaBiO 3 · n H 2 O from X-ray diffraction (XRD) data; however, no details for the crystal structure were reported.…”