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Preparation method of porous barium strontium titanate powder

A technology of barium strontium titanate and porous titanium, which is applied in the field of inorganic non-metallic functional materials, can solve the problems of non-dense microstructure, insufficient specific surface area, and poor uniformity, and achieve excellent size uniformity and dispersion, and good environmental friendliness high performance and low cost of raw materials

Active Publication Date: 2017-01-04
南京宇热材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porous strontium / barium titanate prepared by the above method is a bulk material with a non-dense microstructure, the specific surface area is still not rich enough, and the uniformity is poor.

Method used

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  • Preparation method of porous barium strontium titanate powder
  • Preparation method of porous barium strontium titanate powder
  • Preparation method of porous barium strontium titanate powder

Examples

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Embodiment 1

[0027] This embodiment is a preparation method of porous strontium barium titanate powder, comprising the following steps:

[0028] Step 1: Barium strontium titanate (Ba 1-x Sr x TiO 3 , BST) in the mass ratio of barium and strontium Ba / Sr=1, weigh 0.08mol / L of barium chloride (BaCl 2 ) and 0.08mol / L strontium nitrate [Sr(NO 3 ) 2 ] to prepare 20 ml of an aqueous solution with a total concentration of Ba and Sr ions of 0.16 mol / L. Then add 2.0 mol / L mineralizer potassium hydroxide (KOH) to the above solution, stir for 30 min until it is fully dissolved and mixed uniformly, then transfer the above mixed solution to one of the polytetrafluoroethylene double-chamber linings. cavity;

[0029] Step 2: Weigh tetrabutyl titanate according to the Ti ratio of 0.04 mol / L in the entire reaction system, and then add a small amount of deionized water and dilute nitric acid solution to it to inhibit the hydrolysis of tetrabutyl titanate, and then prepare The resulting solution is tra...

Embodiment 2

[0036] This embodiment is a preparation method of porous strontium barium titanate powder, comprising the following steps:

[0037] Step 1: Barium strontium titanate (Ba 1-x Sr x TiO 3 , BST) in the mass ratio of barium and strontium Ba / Sr=5 / 3, weigh 0.10mol / L of barium chloride (BaCl 2 ) and 0.06mol / L strontium nitrate [Sr(NO 3 ) 2 ] to prepare 20 ml of an aqueous solution with a total concentration of Ba and Sr ions of 0.16 mol / L. Then add 2.0mol / L mineralizer potassium hydroxide (KOH) to the above solution, stir for 30 min until it is fully dissolved and uniformly mixed, then transfer the above mixed solution to a cavity lined with a polytetrafluoroethylene double cavity Inside;

[0038] Step 2: Weigh tetrabutyl titanate according to the Ti ratio of 0.04 mol / L in the entire reaction system, and then add a small amount of deionized water and dilute nitric acid solution to it to inhibit the hydrolysis of tetrabutyl titanate, and then prepare The solution was transferre...

Embodiment 3

[0045] This embodiment relates to a preparation method of porous strontium barium titanate powder, comprising the following steps:

[0046] Step 1: Barium strontium titanate (Ba 1-x Sr x TiO 3 , BST) in the mass ratio of barium and strontium Ba / Sr=1 / 3, weigh 0.04mol / L of barium chloride (BaCl 2 ) and 0.12mol / L strontium nitrate [Sr(NO 3 ) 2 ] to prepare 20 ml of an aqueous solution with an ion concentration at the A site (Ba+Sr) of 0.16 mol / L. Then add 2.0 mol / L mineralizer potassium hydroxide (KOH) to the above solution, stir for 30 min until it is fully dissolved and uniformly mixed, then transfer the above mixed solution to a cavity lined with a polytetrafluoroethylene double cavity Inside;

[0047] Step 2: Weigh tetrabutyl titanate according to the Ti ratio of 0.04 mol / L in the whole reaction system, and then add a small amount of deionized water and dilute nitric acid solution to it, so as to inhibit the hydrolysis of tetrabutyl titanate. The prepared solution is t...

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Abstract

The invention discloses a preparation method of barium strontium titanate powder of a micro-nano porous structure and especially synthesis of the barium strontium titanate powder of the micro-nano porous structure in the hydrothermal high-temperature mixing state. In the method, two solutions serving as reaction precursors are put in two cavities of a tetrafluoroethylene dual-cavity lining respectively, and mixing high-temperature reaction is conducted when the temperature is raised to 180-220 DEG C. Compared with the prior art, the method has the advantages that no organic foaming agent is used in the reaction process, raw materials are lower in cost, and better environmentally friendliness is achieved; reaction is conducted in a mild hydrothermal environment, no calcining treatment is needed, energy consumption is low, and high stability and repeatability are achieved; the prepared porous barium strontium titanate powder is of the unique micro-nano porous structure, has larger specific surface area and higher stability, has excellent size uniformity and dispersity, and has wide application prospects on the aspects of functional ceramic, catalysis and adsorption.

Description

technical field [0001] The invention relates to a method for preparing porous strontium barium titanate powder, in particular to a method for synthesizing porous strontium barium titanate powder with a micro-nano structure by a hydrothermal high-temperature mixing method, which belongs to the field of inorganic non-metallic functional materials. Background technique [0002] Barium strontium titanate has a perovskite structure and is a widely used inorganic non-metallic functional material. Its main advantages include good thermal stability, low dielectric loss, and high dielectric constant. Since the misalignment of positive and negative charge centers in the perovskite structure induces spontaneous polarization, the existence of this built-in electric field can effectively promote the recombination of electron-hole pairs and prolong the lifetime of carriers. Therefore, barium strontium titanate, as a semiconductor material with a band gap of 3.2-3.8 eV, has received more a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/28B01J20/30B01J23/02C04B35/468
CPCB01J20/04B01J20/28014B01J23/02C04B35/4682C04B2235/3213
Inventor 朱孔军古其林
Owner 南京宇热材料科技有限公司
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