Method for preparing lanthanum-doped bismuth titanate nano powder by sol-gel hydrothermal method

Abstract

The invention discloses a method for preparing lanthanum-doped bismuth titanate nano powder by a sol-gel hydrothermal method, which comprises the following steps of: dissolving Bi (NO3) 3.5H2O and La (NO3) 3.6H2O into glacial acetic acid solution to obtain solution A; dropwise adding Ti (OC4H9) 4 into organic solvent to obtain solution B; dropwise adding the solution B into the solution A, and preparing even sol by magnetic stirring; putting the sol into a drying oven, and drying to obtain xerogel; grinding to obtain powdered hydrothermal reaction precursor; putting the hydrothermal reaction precursor into a hydrothermal kettle, and adding pure water taken as solvent and NaOH taken as mineralizer into the hydrothermal kettle; sealing the reaction kettle, and putting the reaction kettle into the drying oven at 160-170 DEG C; taking out products after reaction, and filtering to obtain precipitate; and finally, washing and drying the precipitate to obtain the lanthanum-doped bismuth titanate nano powder. The method can be used for preparing the lanthanum-doped bismuth titanate nano powder under the condition of low temperature, so that the energy is saved, and lanthanum-doped bismuth titanate is perfect in crystallization.

Description

technical field

[0001] The invention relates to a preparation method of lanthanum-doped bismuth titanate nanopowder, in particular to a method for preparing lanthanum-doped bismuth titanate nanopowder by a sol-gel hydrothermal method. Background technique

[0002] Bismuth titanate (Bi 4 Ti 3 o 12 , BTO) is a ferroelectric material with a layered perovskite structure, due to its high Curie temperature (675°C), large spontaneous polarization (50μC / cm 2 ) and good thermal stability, it has broad application prospects in capacitors, high-temperature piezoelectric sensors and optoelectronic devices, and has become one of the hotspots in the research of new functional materials. However, bismuth titanate material also has disadvantages such as high coercive electric field, large leakage conduction current, low remnant polarization and weak piezoelectricity, which severely limit its practical application. In 1999, B.H.Park et al. published La-doped Bi in Nature. 4 Ti 3 o 12 ...

Images