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Co-precipitation in situ preparation of nano-strontium barium titanate/magnesia composite powder

An in-situ preparation and co-precipitation technology, applied in the direction of magnesium oxide, titanate, nanotechnology, etc., can solve the problems of low interface bonding strength, large extrinsic loss, uneven distribution, etc., and achieve low cost and high particle size The effect of uniformity and simple preparation process

Active Publication Date: 2017-12-08
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a large extrinsic loss in the two-phase kneading and sintering composite ceramics, which greatly limits its wide application.
In order to overcome the shortcomings of coarse particles, low interfacial bonding strength, uneven distribution, and poor density in the preparation of composite materials by two-phase kneading and sintering, it is urgent to develop a composite powder preparation technology with good dispersion, uniform particle size, and high crystallinity

Method used

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  • Co-precipitation in situ preparation of nano-strontium barium titanate/magnesia composite powder
  • Co-precipitation in situ preparation of nano-strontium barium titanate/magnesia composite powder
  • Co-precipitation in situ preparation of nano-strontium barium titanate/magnesia composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Dissolve a portion of 0.05mol of barium nitrate, 0.05mol of strontium nitrate and 0.1mol of magnesium nitrate in 200ml of deionized water, stir well to obtain a solution containing Ba, Sr and Mg;

[0024] 2) Dissolve 0.2mol oxalic acid in 200ml ethanol and stir evenly to obtain an oxalic acid-ethanol solution;

[0025] 3) Dissolve a portion of 0.1mol butyl titanate in the above oxalic acid-ethanol solution and stir evenly to obtain a titanium oxalate solution;

[0026] 4) Mix the solution containing Ba, Sr, Mg and the solution containing Ti obtained above, stir evenly, and then divide into six solutions;

[0027] 5) Slowly add ammonia water to the five solutions to adjust the pH value, and obtain five kinds of pH=2, pH=3, pH=4, pH=6 and pH=10 (1- x ) Ba 0.5 Sr 0.5 TiO 3 - x MgO( x =0.5) precursor solution;

[0028] 6) The above six (1- x ) Ba 0.5 Sr 0.5 TiO 3 - x MgO( x =0.5) The precursor solution was subjected to co-precipitation reaction for 48h, then...

Embodiment 2

[0033] 1) Mix a part of 0.0475mol of barium nitrate, 0.0475mol of strontium nitrate and 0.005mol of magnesium nitrate, a part of 0.035mol of barium nitrate, 0.035mol of strontium nitrate and 0.03mol of magnesium nitrate, a part of 0.025mol of barium nitrate , 0.025mol of strontium nitrate and 0.05mol of magnesium nitrate, a portion of 0.005mol of barium nitrate, 0.005mol of strontium nitrate and 0.09mol of magnesium nitrate, respectively dissolved in 100ml of deionized water, stirred evenly to obtain four and a solution of Mg;

[0034] 2) Dissolve one part of 0.19mol oxalic acid, one part of 0.14mol oxalic acid, one part of 0.10mol oxalic acid and one part of 0.02mol oxalic acid in 100ml ethanol and stir well to obtain four oxalic acid-ethanol solutions;

[0035] 3) Dissolve one part of 0.095mol butyl titanate, one part of 0.07mol butyl titanate, one part of 0.05mol butyl titanate and one part of 0.01mol butyl titanate in the above oxalic acid-ethanol solution and stir well, ...

Embodiment 3

[0042] 1) Mix one part of 0.019mol of barium nitrate, 0.076mol of strontium nitrate and 0.005mol of magnesium nitrate, one part of 0.014mol of barium nitrate, 0.056mol of strontium nitrate and 0.03mol of magnesium nitrate, one part of 0.01mol of barium nitrate , 0.04mol of strontium nitrate and 0.05mol of magnesium nitrate, a portion of 0.002mol of barium nitrate, 0.008mol of strontium nitrate and 0.09mol of magnesium nitrate, respectively dissolved in 100ml of deionized water, stirred evenly to obtain four and a solution of Mg;

[0043] 2) Dissolve one part of 0.19mol oxalic acid, one part of 0.14mol oxalic acid, one part of 0.10mol oxalic acid and one part of 0.02mol oxalic acid in 100ml ethanol and stir well to obtain four oxalic acid-ethanol solutions;

[0044] 3) Dissolve one part of 0.095mol butyl titanate, one part of 0.07mol butyl titanate, one part of 0.05mol butyl titanate and one part of 0.01mol butyl titanate in the above oxalic acid-ethanol solution and stir well,...

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Abstract

The invention relates to a method for preparing nano (1-x)Ba1-nSrnTiO3-xMgO complex-phase powder in situ by coprecipitation. A preparation flow comprises the following steps: weighing nitrates of barium, strontium and magnesium into water according to an accurate stoichiometric ratio to prepare a solution A; weighing butyl titanate according toan accurate stoichiometric ratio and dissolving into an ethanol-oxalic acid solution to prepare a solution B; slowly dropwise adding ammonia water into a mixed solution of the solution A and the solution B and carrying out a coprecipitation reaction; controlling the pH value of the reaction system to be 2-10; and carrying out filtering, washing, heat treatment and grinding on precipitate to obtain the nano (1-x)Ba1-nSrnTiO3-xMgO complex-phase powder. The preparation process is simple, short in period and low in cost; and the obtained nano complex-phase powder has good dispersity, uniform grain diameter and high degree of crystallization and can be put into practice.

Description

technical field [0001] The invention belongs to the field of electronic materials and catalysis industry, and specifically relates to the in-situ preparation of nanometer (1-x) Ba by co-precipitation 1-n Sr n TiO 3 -xMgO composite powder method. Background technique [0002] barium strontium titanate ferroelectric material (Ba 1-n Sr n TiO 3 , BST) because its Curie temperature is adjustable with the ratio of Ba / Sr and has strong dielectric nonlinearity and low dielectric loss in the paraelectric state, so it is used in tuners, filters, phase shifters, etc. Microwave devices have broad application prospects and have become one of the research hotspots at home and abroad in recent years. However, the dielectric constant of BST ferroelectric materials in the microwave frequency range is relatively high, and it is difficult to meet the requirements for matching the internal impedance of the excitation source and high-power devices. The use of low dielectric constant micr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/626B82Y30/00
CPCC01F5/06C01G23/005C01G23/006C01P2002/72C01P2004/03C01P2004/04
Inventor 张景基高亚锋姬卢东王疆瑛
Owner CHINA JILIANG UNIV
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