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Preparation of nano barium titanate powder

A barium titanate powder, nano technology, applied in chemical instruments and methods, crystal growth, titanium compounds, etc., can solve the problems of complicated washing process, affecting the purity of powder, etc., to reduce adverse effects, good crystallization, Good dispersion effect

Inactive Publication Date: 2009-01-21
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the disadvantages of introducing impurity ions into the existing preparation method, which complicates the washing process and affects the purity of the powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 Using tetrabutyl titanate as a titanium source to synthesize nano barium titanate powder (preparation of precursor)

[0019] (1) Measure 34.04mlTi(C 4 h 9 O) 4 , dissolve with 68.08ml of ethanol, stir evenly to obtain a transparent liquid; add 30ml of ammonia water under stirring, control the pH value> 8.5, stir fully at room temperature for 30 minutes; filter and wash for 5 minutes, maintain the suspension state, and the temperature of the washing water is 40°C to obtain the precursor;

[0020] (2) Mix the precursor with 58.52 grams of Ba(OH) 2 ·8H 2 After O is mixed, join in the reactor, add 5 grams of sodium dodecylbenzenesulfonate, stir for about 10 minutes, regulate filling degree 80% in the kettle with distilled water, Ba / Ti mol ratio is 1.8;

[0021] (3) After closing the reactor, heat up to 180°C, control the reaction time to 12h, cool to room temperature, filter, wash, and dry at 105°C for 2h to obtain barium titanate powder with a particle size ...

Embodiment 2

[0022] Example 2 Using tetrabutyl titanate as a titanium source to synthesize nano barium titanate powder (preparation of precursor)

[0023] (1) Measure 34.04mlTi(C 4 h 9 O) 4 , dissolved with 51.06ml of ethanol, stirred evenly, to obtain a transparent liquid; add 30ml of ammonia water under stirring, control the pH value > 8.5, and stir fully at room temperature for 30 minutes; filter and wash for 5 minutes, keep the suspension state, and the temperature of the washing water is 30°C to obtain the precursor;

[0024] (2) Mix the precursor with 48.77 grams of Ba(OH) 2 ·8H 2 O mixed and added to the reaction kettle, added 20ml of isopropanol, stirred for about 10 minutes, adjusted the filling degree in the kettle with distilled water to 70%, and the Ba / Ti molar ratio was 1.5;

[0025] (3) After closing the reactor, heat up to 220°C, control the reaction time to 10h, cool to room temperature, filter, wash, and dry at 105°C for 2h to obtain barium titanate powder with a part...

Embodiment 3

[0026] Example 3 Synthesis of nano barium titanate powder with tetrabutyl titanate as titanium source (no precursor prepared)

[0027] (1) Measure 34.04mlTi(C 4 h 9 O) 4 , dissolved in 68.08ml of ethanol, stirred evenly, and put into the reaction kettle;

[0028] (2) Weigh 58.52 grams of Ba(OH) 2 ·8H 2 O joins in the reactor, adds 5 grams of sodium dodecylbenzenesulfonate, stirs for about 10 minutes, regulates filling degree 80% in the kettle with distilled water, and Ba / Ti mol ratio is 1.8;

[0029] (3) After closing the reactor, heat up to 240°C, control the reaction time to 12h, cool to room temperature, filter, wash, and dry at 105°C for 2h to obtain barium titanate powder with a particle size of 50-90nm.

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Abstract

The invention relates to a preparation method for nano barium titanate powder. The method comprises the following steps: nano titanium dioxide (TiO2), tetrabutyl titanate (TiC16H36O4) and barium hydroxide (Ba(OH)2.8H2O) are takes as raw materials, and ammonia water is taken as a precipitating agent; moreover, an appropriate surface-active agent or organic solvent is selected to adjust reaction medium so as to carry out reaction at a temperature between 150 and 300 DEG C for 4 to 24 hours with the filling degree of between 60 and 90 percent and the Ba to Ti molar ratio of between 1.1 and 3.0; and finally, after the reactants are cooled down to room temperature, filtration, washing and drying are carried out so as to prepare the nano barium titanate powder. The technique can simplify technical steps, and has easily controlled technical parameters; moreover, the prepared powder has the characteristics of complete crystallization, controllable grain diameter range of between 50 and 90nm, narrow granule distribution range, high purity, excellent dispersivity, high sintering activity, and the like; because the adopted raw materials do not contain common ions such as Cl-, K+ and N+, the preparation method can simplify washing process and increase the purity of the powder, thereby reducing the adverse influence on material properties caused by impurity ions and ensuring the quality of high-end products.

Description

technical field [0001] The invention relates to a method for preparing nano barium titanate powder by using different titanium sources and additives, belonging to the field of inorganic non-metallic materials. Background technique [0002] Barium titanate (BaTiO 3 ) is an important perovskite-type ferroelectric material. Because of its high dielectric constant, low dielectric loss, excellent withstand voltage and insulation properties, it has become the main raw material for the manufacture of electronic ceramics and is widely used To make multilayer ceramic capacitors (MLCC), thermistors (PTCR), electro-optic devices and DRMA devices, etc., known as "the pillar of the electronic ceramic industry". With the development of electronic components in the direction of micro, thin and light, the number of MLCC dielectric layers is required to increase and the thickness of the dielectric layer is continuously reduced. For small grain size, narrow particle size distribution range, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B7/10C01G23/00
Inventor 李艳君莫雪魁刘晓存
Owner UNIV OF JINAN
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