A kind of lanthanide rare earth ion-doped bismuth titanate single crystal flake and preparation method thereof

Abstract

The invention discloses a lanthanide rare earth ion doped bismuth titanate monocrystal thin slice and a preparation method thereof. The lanthanide rare earth ion doped bismuth titanate monocrystal thin slice is 5-10 microns in length and 50-200nm in thickness. The preparation method comprises the following steps of: 1, preparing a lanthanide rare earth ion doped bismuth titanate precursor solution by adopting ethylene glycol monomethyl ether as a solvent according to an element molar ratio of Bi:R:Ti=(4-x):x:3 in a formula Bi4-xRxTi3O12 (R is a lanthanide rare earth element, and x is more than 0 and is less than or equal to 1.5); 2, adding an NaOH aqueous solution into the precursor solution, and then filtering to obtain a deposit; and 3, uniformly stirring the deposit, heating the deposit in a reaction kettle, and cleaning and drying a product after reaction to obtain the lanthanide rare earth ion doped bismuth titanate monocrystal thin slice. According to the preparation method, an organic solvent is used as a main reaction medium, and a hydrolysis reaction caused by a lot of water is effectively avoided, so that the generation of an impurity phase is avoided. The lanthanide rare earth ion doped bismuth titanate monocrystal thin slice prepared by the preparation method is large in size and high in purity without the generation of the impurity phase.

Description

technical field [0001] The invention belongs to the field of inorganic chemistry, and in particular relates to a bismuth titanate single crystal flake doped with lanthanide rare earth ions and a preparation method thereof. Background technique: [0002] With the advancement of science and technology and the miniaturization trend of electronic devices, ferroelectric micro-nano materials have been paid attention to. Micro-nanomaterials have physical and chemical properties different from their bulk materials, and these physical and chemical properties depend to a large extent on the size and morphology of the material. Lanthanide rare earth ions (such as La3+, Nd3+, Pr3+, Sm3+, Eu3+, etc.) doped bismuth titanate materials have large remnant polarization, good fatigue resistance, high Curie temperature and low heat treatment temperature. The most promising new lead-free ferroelectric materials to replace traditional lead-based ferroelectrics. At present, there are many method...

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Problems solved by technology

[0003] Bismuth titanate doped with lanthanide rare earth ions is a ferroelectric material with a complex bismuth layered perovskite structure. In the preparation of bismuth titanate or other ion-doped bismuth titanate and other titanium by liquid phase method, especially hydrothermal method Bismuth titanate series micro-nano materials, because the reaction medium contains a large amount of water, Bi salt is prone to hydrolysis side reactions, so that the product contains Bi2O3 or pyrochlore phase Bi2Ti2O7 and other impurities, it is difficult to obtain pure-phase bismuth titanate series materials

At present, some bismuth titanate series micro-nano materials have been prepared, but it needs to go through a cumbersome co-precipitation process to remove impurity ions, or add additives to obtain pure-phase bismuth titanate series materials

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