Method for preparing rhombohedron single-crystal bismuth ferrite powder by fused salt

Abstract

The invention discloses a method for preparing rhombohedron single-crystal bismuth ferrite powder by fused salt. The method includes mixing Fe2O3 and Bi2O3 according to proportion, adding fused salt and then performing wet ball milling, drying and calcining at the temperature of 650-800 DEG C for 1-3 hours after wet ball milling, washing with deionized water and drying to obtain finished products after cooling to the room temperature along with the furnace, wherein the fused salt is KCl and / or KBr. By utilizing KCl, KBr and composite salt of KCl and KBr as fused salt, microcosmic shape and size of BiFeO3 powder can be controlled by adjusting calcination temperature and reaction time and the like, the rhombohedron single-crystal bismuth ferrite powder which is purer, uniform in grain distribution and excellent in repeatability during preparation can be synthesized at lower temperature, and the method can be used for research and production of multiferroic BiFeO3 materials.

Description

1. Technical field [0001] The invention relates to a preparation method of multiferroic bismuth ferrite powder, specifically a method for preparing rhombohedral monocrystalline bismuth ferrite powder by molten salt method, which can synthesize single-phase bismuth ferrite powder at a relatively low temperature Multiferroic bismuth ferrite powder material. 2. Background technology [0002] Multiferroic materials refer to multifunctional materials that have two or more of ferroelectricity, ferromagnetism and ferroelasticity at the same time. This type of material can be widely used in transducers, magnetoelectric sensors, spintronic devices, High-tech fields such as new memory devices. Bismuth ferrite (BiFeO 3 ) is one of the few functional materials discovered so far that is a single phase at room temperature and has multiferroic properties. Bismuth ferrite has ferroelectricity and antiferromagnetism, accompanied by weak ferromagnetism, and has high Neel temperature (TN=6...

AI Technical Summary

Problems solved by technology

Although the liquid phase method has the advantages of low synthesis temperature, BiFeO 3 The powder has the advantages of high purity and fine and uniform particles, but these methods generally have disadvantages such as many process steps, relatively long synthesis cycle, low output, and high cost, which are not conducive to large-scale industrial production

[0006] So far, there is no domestic preparation of BiFeO by molten salt method 3 There are few reports about powders in foreign countries. Jun Chen et al. 2 SO 4 For molten salt, single-phase BiFeO was synthesized in 800-820°C in only 20 minutes 3 Powder, but this kind of NaCl and Na 2 SO 4 Because the synthesis temperature of molten salt is high and the temperature range is very narrow (about 20°C), it is not conducive to actual production control

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