Method of preparing two-component co-doped BST (Barium Strontium Titanate) micro-nano powder

A technology of micro-nano powder and precursor is applied in the field of preparation of BST micro-nano powder, which can solve the problem that BST micro-nano powder with full perovskite structure cannot be obtained, the stability of sol is low, and uniform stability cannot be obtained. Pure gel and other problems, to achieve the effect of reducing dielectric loss and dielectric temperature coefficient, improving tuning rate and dielectric strength, reducing capacitance and dielectric constant

Inactive Publication Date: 2011-05-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] For the BST powder prepared by the conventional Sol-gel method, due to the low stability of the sol, it precipitates rapidly during the heating and baking process, so that a uniform, stable and pure gel cannot be obtained, and the full perovskite cannot be obtained during the sintering process. The technical problem of BST micro-nano powder with structure, the present invention provides a kind of preparation method of binary co-doped BST micro-nano powder

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  • Method of preparing two-component co-doped BST (Barium Strontium Titanate) micro-nano powder
  • Method of preparing two-component co-doped BST (Barium Strontium Titanate) micro-nano powder
  • Method of preparing two-component co-doped BST (Barium Strontium Titanate) micro-nano powder

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[0035] A preparation method of binary co-doped BST micro-nano powder, comprising the following steps:

[0036] Step 1: preparing BST sol;

[0037]The precursors of Ba and Sr are dissolved in hot glacial acetic acid to form a barium strontium precursor solution, and butyl titanate is mixed with acetylacetone to form a titanium precursor solution, then the barium strontium precursor solution and the titanium precursor solution are mixed, and the equivalent of Ti is added at the same time 0.25-1.25% citric acid in molar dosage, then use glacial acetic acid to adjust the pH value of the mixed solution to between 3-4, and finally use ethylene glycol methyl ether to obtain 0.2-0.4M BST sol, in which Ba, Sr and The molar ratio of Ti is x: (1-x): (1+y), 0

[0038] Step 2: Prepare Mn, Ce or Y doped precursors respectively...

Embodiment 1

[0043] Embodiment 1: do not add citric acid Ba 0.6 Sr 0.4 TiO 3 Preparation of micro-nano powder:

[0044] Step 1: preparing BST sol;

[0045] Dissolve the precursors of Ba and Sr in hot glacial acetic acid to form a barium strontium precursor, mix butyl titanate with acetylacetone to form a titanium precursor, then mix the barium strontium precursor and titanium precursor, and then use glacial acetic acid to adjust The pH value of the mixed solution is between 3 and 4, and finally the BST sol of 0.2 to 0.4 M is obtained by constant volume with ethylene glycol methyl ether, wherein the molar ratio of Ba, Sr and Ti is 0.6:0.4:1; the Ba and Sr The precursor is acetate or nitrate of Ba and Sr; the amount of acetylacetone is 1.5 to 2.5 times the molar amount of butyl titanate;

[0046] Step 2: Dry the BST sol obtained in step 1 at 80-120°C to form a gel; then sinter the gel at 750-900°C for 180-240 minutes, and then cool naturally to obtain undoped BST micro-nano powder .

...

Embodiment 2

[0048] Embodiment 2: the preparation of adding 0.75% mol ratio citric acid BST micro-nano powder

[0049] Step 1: preparing BST sol;

[0050] The precursors of Ba and Sr are dissolved in hot glacial acetic acid to form a barium strontium precursor solution, and butyl titanate is mixed with acetylacetone to form a titanium precursor solution, then the barium strontium precursor solution and the titanium precursor solution are mixed, and the equivalent of Ti is added at the same time 0.75% citric acid in molar amount, then use glacial acetic acid to adjust the pH value of the mixed solution to between 3 and 4, and finally use ethylene glycol methyl ether to obtain 0.2 to 0.4M BST sol, in which Ba, Sr and Ti The molar ratio is 0.6:0.4:1; the precursors of Ba and Sr are acetates or nitrates of Ba and Sr; the amount of acetylacetone is 1.5 to 2.5 times the molar weight of butyl titanate;

[0051] Step 2: Dry the BST sol obtained in step 1 at 80-120°C to form a gel; then sinter the...

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Abstract

The invention provides a method of preparing a two-component co-doped BST (Barium Strontium Titanate) micro-nano powder by aiming at the technical problem of poor dielectric property caused by impure phases in the BST powder prepared with a common Sol-gel method, belonging to the technical field of functional materials. The method comprises the following steps of: carrying out two-component co-doping on BST and adding citric acid in the process of preparing BST collosol so as to greatly improve the stability and the uniformity of the two-component co-doped BST collosol in the forming process; thus, the collosol with higher purity is obtained, and the BST micro-nano powder without containing impure phases is obtained after the collosol is sintered so that the dielectric property is greatly improved (the dielectric constant is from 150 to 1200, the tuning rate is from 0% to 65%, the dielectric loss is from 0.0003 to 0.006, and the dielectric temperature coefficient is from 0.0002 to 0.001/K). The two-component co-doped BST micro-nano powder can be applied to microwave tuning devices, and the method has the advantages of convenience, rapidness, low cost and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a preparation method of BST micro-nano powder with a perovskite structure. Background technique [0002] It is difficult to improve the comprehensive dielectric properties of existing microwave devices, and it is difficult to meet the high requirements in fields such as communications, aerospace and military. Therefore, it is very important to develop tuning materials with excellent comprehensive properties. As a promising microwave tuning material, BST has been a research focus for nearly 10 years. [0003] However, the inherent limitations of BST restrict its excellent dielectric properties and applications. The inherent limitations of BST are as follows: the dielectric tuning rate and dielectric loss are high in the ferroelectric phase, and both are low in the paraelectric phase, so it is difficult to increase the ratio of tuning rate to loss. Over the years, peop...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/47C04B35/624C04B35/626
Inventor 廖家轩汪澎魏雄邦徐自强尉旭波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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