A kind of preparation method of lead titanate film based on strontium titanate doped niobate

A technology doped with strontium niobate titanate and lead titanate, which is applied in the field of preparation of lead titanate thin films, can solve the problems that pure lead titanate thin films cannot be put into practical application, high grain boundary energy, etc., and achieve low cost, easy control, easy to produce effects

Active Publication Date: 2021-02-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to achieve the application of thin film materials, there are two technical difficulties that need to be overcome: first, the thin film needs to have a smooth and complete and dense surface, and requires the thin film to have outstanding crystallization properties and precise stoichiometric ratio; second, , due to some intrinsic characteristics of lead titanate powder materials, such as large square coercive field, high grain boundary energy, and large lattice structure anisotropy (c / a=1.065), pure titanium Lead acid thin films cannot be put into practical application at present

Method used

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  • A kind of preparation method of lead titanate film based on strontium titanate doped niobate
  • A kind of preparation method of lead titanate film based on strontium titanate doped niobate
  • A kind of preparation method of lead titanate film based on strontium titanate doped niobate

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Experimental program
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Effect test

Embodiment 1

[0025]1) Weigh an appropriate amount of potassium hydroxide and place it in the inner pot of the polytetrafluoroethylene reactor, add 20 mL of deionized water to dissolve, stir thoroughly, and obtain a potassium hydroxide aqueous solution with a molar concentration of 4 mol / L;

[0026]2) Under stirring, add 1.708 g of tetra-n-butyl titanate to the potassium hydroxide aqueous solution prepared in step 1), and stir for 10 minutes;

[0027]3) Weigh an appropriate amount of lead nitrate, dissolve it in deionized water, and stir thoroughly to obtain an aqueous solution of lead nitrate; the molar ratio of lead to titanium is 1.25;

[0028]4) The lead nitrate aqueous solution prepared in step 3) is added to 2), and the volume of the reaction material in the reactor tank is adjusted with deionized water to reach 80% of the reactor tank volume (the volume of the reactor tank is 45ml ), stir for at least 2h to obtain a precursor solution, the volume base of the molar concentration is the total volume ...

Embodiment 2

[0032]1) Weigh an appropriate amount of potassium hydroxide and place it in the inner pot of the polytetrafluoroethylene reactor, add 20 mL of deionized water to dissolve, stir thoroughly, and obtain a potassium hydroxide aqueous solution with a molar concentration of 4 mol / L;

[0033]2) Under stirring, add 0.854 g of tetra-n-butyl titanate to the potassium hydroxide aqueous solution prepared in step 1), and stir for 10 minutes;

[0034]3) Weigh an appropriate amount of lead nitrate, dissolve it in deionized water, and stir thoroughly to obtain an aqueous solution of lead nitrate. The molar ratio of lead to titanium is 1.25;

[0035]4) Add the lead nitrate aqueous solution prepared in step 3) to 2), adjust the volume of the reaction material in the reactor tank with deionized water to reach 80% of the reactor tank volume, and stir for at least 2 hours to obtain a precursor solution , The volume base of the molar concentration is the total volume of the precursor solution;

[0036]5) Wash the ni...

Embodiment 3

[0039]1) Weigh an appropriate amount of potassium hydroxide and place it in the inner pot of the polytetrafluoroethylene reactor, add 20mL of deionized water to dissolve, stir well, and obtain a potassium hydroxide aqueous solution with a molar concentration of 4.7mol / L;

[0040]2) Under stirring, add 1.708 g of tetra-n-butyl titanate to the potassium hydroxide aqueous solution prepared in step 1), and stir for 10 minutes;

[0041]3) Weigh an appropriate amount of lead nitrate, dissolve it in deionized water, and stir thoroughly to obtain an aqueous solution of lead nitrate. The molar ratio of lead to titanium is 1.25;

[0042]4) Add the lead nitrate aqueous solution prepared in step 3) to 2), adjust the volume of the reaction material in the reactor tank with deionized water to reach 80% of the reactor tank volume, and stir for at least 2 hours to obtain a precursor solution , The volume base of the molar concentration is the total volume of the precursor solution;

[0043]5) Wash the niobium-...

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Abstract

The invention discloses a method for preparing a lead titanate film based on strontium niobate titanate. The method adopts hydrothermal reaction, uses tetra-n-butyl titanate and lead nitrate as main raw materials, and potassium hydroxide as mineralization Stir vigorously at room temperature, use niobium-doped strontium titanate as a substrate, and then carry out hydrothermal reaction at high temperature to obtain lead titanate film. The process of the method of the invention is simple, easy to control, low in cost, and easy for large-scale production; the preparation method can obtain a large-area heteroepitaxial film with a smooth surface and an atomic-level interface, and obtains good ferroelectric properties. Ferroelectric memories, pyroelectric sensors, optical waveguides, micromachines, and electro-optic switches have broad potential applications.

Description

Technical field[0001]The invention relates to a method for preparing a lead titanate thin film based on doped strontium niobium titanate, and belongs to the field of functional material preparation.Background technique[0002]Ferroelectric thin film materials have a large application market, and play a major role in many fields such as ferroelectric memory, optical waveguides, etc. This is inseparable from its good intrinsic properties, such as good ferroelectric properties and high High dielectric constant and stability. Lead titanate is a typical ferroelectric material, and its structure is a tetragonal perovskite structure. It has many excellent properties, such as a Curie temperature of up to 490°C, good stability, and large piezoelectric anisotropy. The opposite sex, and it is easy to adjust its performance, so it has a very good application prospect. In recent years, microelectronics technology has been rapidly developed, and people have also invested more energy in the developm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B7/10C04B35/472C04B35/622
CPCC04B35/472C04B35/62218C04B41/009C04B35/47
Inventor 任召辉陈嘉璐武梦姣傅钢杰韩高荣
Owner ZHEJIANG UNIV
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