Indium-and-yttrium-codoped strontium titanate nanomaterial and its preparation method

A technology of barium strontium titanate and nanomaterials is applied in the field of composite doped ferroelectric nanomaterials and their preparation, and can solve the problems of difficulty in improving the comprehensive dielectric properties of BST nanomaterials, incomplete balance of internal charges, and large grain size. , to achieve the effect of high tuning rate, low dielectric loss and high dielectric constant

Inactive Publication Date: 2011-03-16
成都成电电子信息技术工程有限公司
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AI Technical Summary

Problems solved by technology

BST nanomaterials doped with a single component of cerium or yttrium, because the internal charges cannot be completely balanced, there is a large concentration of oxygen vacancy defect concentration, and the grain size is large, it is difficult to improve the comprehensive dielectric properties of BST nanomaterials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: prepare the Ba of the cerium yttrium co-doped of 1mol% 0.6 Sr 0.4 TiO 3 film, the steps are as follows:

[0024] (1) According to barium strontium titanate Ba 0.6 Sr 0.4 TiO 3 The stoichiometric ratio of barium acetate and strontium acetate of 0.6 mol ratio and 0.4 mol ratio were weighed and dissolved in hot glacial acetic acid, and the barium strontium precursor was formed after fully stirring for 120 minutes;

[0025](2) Weigh 1 mol ratio of butyl titanate and appropriate amount of acetylacetone, mix, heat and stir for 120 minutes to form a titanium precursor solution.

[0026] (3) Weighing 0.01 mol specific cerium acetate and yttrium acetate respectively and dissolving them in hot glacial acetic acid, mixing, heating and stirring for 120 minutes to form a cerium-yttrium precursor solution;

[0027] (4) Fully mix the barium strontium precursor solution, titanium precursor solution and cerium yttrium precursor solution and heat and stir, then add et...

Embodiment 2

[0029] Embodiment 2: prepare the Ba of the barium strontium gradient change of each 1mol% cerium yttrium co-doped of four layers 0.5 Sr 0.5 TiO 3 / Ba 0.6 Sr 0.4 TiO 3 / Ba 0.7 Sr 0.3 TiO 3 / Ba 0.8 Sr 0.2 TiO 3 film, the steps are as follows:

[0030] (1) According to barium strontium titanate Ba 0.5 Sr 0.5 TiO 3 、Ba 0.6 Sr 0.4 TiO 3 、Ba 0.7 Sr 0.3 TiO 3 and Ba 0.8 Sr 0.2 TiO 3 The stoichiometric ratio of barium acetate and strontium acetate (0.5mol ratio and 0.5mol ratio; 0.6mol ratio and 0.4mol ratio; 0.7mol ratio and 0.3mol ratio and 0.8mol ratio and 0.2mol ratio) were dissolved in hot glacial acetic acid In, after stirring thoroughly for 120 minutes, Ba 0.5 Sr 0.5 、Ba 0.6 Sr 0.4 、Ba 0.7 Sr 0.3 and Ba 0.8 Sr 0.2 Barium strontium precursor;

[0031] (2) Weigh 1 mol ratio of butyl titanate and appropriate amount of acetylacetone, mix, heat and stir for 120 minutes to form a titanium precursor solution.

[0032] (3) each weighing 0.01mol specific ...

Embodiment 3

[0035] Embodiment 3: prepare four layers of each 0.4mol%, 0.6mol%, 0.8mol% and 1mol% Ba of cerium and yttrium co-doped 0.6 Sr 0.4 TiO 3 Nano film, the steps are as follows:

[0036] (1) According to barium strontium titanate Ba 0.6 Sr 0.4 TiO 3 The stoichiometric ratios were weighed and 0.6mol ratio and 0.4mol ratio barium acetate and strontium acetate were dissolved in hot glacial acetic acid, and Ba was formed respectively after stirring for 120 minutes. 0.6 Sr 0.4 Barium strontium precursor;

[0037] (2) Weigh 1.0 mol ratio of butyl titanate and mix with appropriate amount of acetylacetone, heat and stir for 120 minutes to form a titanium precursor solution.

[0038] (3) Weigh each of 0.004mol ratio, 0.006mol ratio, 0.008mol ratio and 0.01mol ratio of cerium acetate and yttrium acetate and dissolve them in hot glacial acetic acid, mix and heat and stir for 120 minutes to form 0.004mol ratio, 0.006mol ratio, 0.008 The cerium yttrium precursor solution of mol ratio an...

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Abstract

Disclosed is a cerium-yttrium co-doped barium strontium titanate nano-material as well as a method for the production thereof, which belong to the technique field of inorganic electronic functional material. The cerium-yttrium co-doped barium strontium titanate nano-material has main compositions: BaxSr(1-x)TiO3 (0.2<=x<=0.8), part of Ba<2+> ions and Sr<2+> ions are displaced by Y<3+> ions, and part of Ti<4+> ions are displaced by Ce<4+> ions, and all the compositions have an atomic molar ratio of: (Ba<2+>+Sr<2+>):TiO32-:(Y<3+>+Ce<4+>) which is equal to a value between 100:100:0.1 and 100:100:5, and Y<3+> and Ce<4+> have an atomic molar ratio of: Y<3+>:Ce<4+> which is equal to a value between 0.1:4.9 and 4.9:0.1. Precursor solutions of barium strontium, titanium and cerium yttrium are respectively prepared and then are mixed, heated and agitated for obtaining a cerium-yttrium co-doped BST sol; finally the BST sol is made into a BST nano-film or a BST nano-powder. The nano-material and the method have comprehensive dielectric properties of high dielectric constant, high tuning rate, low dielectric loss and high dielectric temperature stability, and can be applied to fields such as random access memories, pyroelectric infrared detectors and microwave tuning devices.

Description

technical field [0001] The invention belongs to the technical field of inorganic electronic functional materials, relates to composite doped ferroelectric nanometer materials and a preparation method thereof, and can be applied to random access memory (DRAM), pyroelectric infrared detectors, microwave tuning devices and other fields. Background technique [0002] Barium strontium titanate (Ba x Sr 1-x TiO 3 , BST) nanomaterials have broad application prospects in the fields of DRAM, infrared detectors and microwave tuning devices due to their high dielectric constant, low leakage current density and nonlinear relationship between dielectric constant and electric field, especially dielectric The nonlinear relationship between the constant and the electric field makes it a new tuning material for microwave tuning devices that can replace semiconductor materials and ferrite materials. However, in order to realize the application of BST nanomaterials, BST nanomaterials must h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/32C30B5/02
Inventor 廖家轩李恩求潘笑风王洪全
Owner 成都成电电子信息技术工程有限公司
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