Low-temperature acetone-assisted hydrothermal synthesis and characterization of BiFeO3 powders

Abstract

Well-crystallized pure perovskite bismuth ferrite (BiFeO 3 ) powders have been synthesized by a facile hydrothermal route at the temperature as low as 130°C with the aid of acetone. In the synthesis, acetone played important roles in the low-temperature synthesis of pure BiFeO 3 . The as-prepared BiFeO 3 powders mainly consisted of cubic particles with the size range from 50 to 200 nm. zero-field-cooled and field-cooled magnetization measurements indicated that pure BiFeO 3 powders showed a spin-glass transition below the freezing temperature. The as-prepared pure BiFeO 3 powders showed weak ferromagnetism and ferroelectricity simultaneously at room temperature. Moreover, the bismuth ferrite BiFeO 3 exhibit efficient photocatalytic activity under visible light irradiation.

Synthesis, structures and properties of single phase BiFeO3 and Bi2Fe4O9 powders by hydrothermal method

“…5a), therefore, it is reasonable that BiFeO 3 shows weak ferromagnetism in the whole temperature range (10-300 K). At 10 K and 20 kOe external field, the maximum magnetization and remnant magnetization are about 0.13 and 0.004 emu/g, respectively, consistent with other report [13,14]. It is noted the magnetization is relatively lower than nano-sized BiFeO 3 [15], which is due to the size effect: small BiFeO 3 can suppress the spiral spin structure with period of *62 nm.…”

Perovskite Oxides Prepared by Hydrothermal and Solvothermal Synthesis: A Review of Crystallisation, Chemistry, and Compositions

“…[202] The hydrothermal synthesis of BiFeO3 was established independently by Chen et al [203] and Han et al [204] in 2006 who produced the material in alkali hydrothermal conditions, showing crystallite-shape dependence on pH and temperature, along with the competitive formation of other bismuth iron oxides, including Bi25FeO40 and Bi2Fe4O9, that are structurally unrelated to the desired perovskite. Numerous other reports of solvothermal synthesis of BiFeO3 have followed, and the ease of its formation has led to extensive exploration of the use of solution additives, such as NH4Cl, [205] and Na2CO3, [206] the use of non-aqueous solvents such as acetone, [207] 2-methoxy ethanol, [208] triethanolamine, [209] polyethylene glycols, [210] , polyvinylalcohol, [211] and use of microwaves instead of conventional heating. [206,212] All of these works have been focussed on optimising synthesis parameters for precise size and shape control of particle morphology, and some examples are shown in Figure 20.…”

Enhanced multiferroic properties of Nd and Co co-doped BiFeO3 ceramics

“…In order to improve the multiferroic properties of BiFeO 3 powder and ceramics, some researchers adopted a variety of processing methods, such as sol-gel [14], microwavehydrothermal process [15], rapid liquid phase sintering method [16], molten salt method [17], hydrothermal synthesis [18] and so on. But it is well known that A-site substitution, B-site substitution, or A and B co-substitution are effective way to improve the properties.…”